Scheduling and calendar APIs: the agent answers

I’d use **Nylas Scheduler**.

It matches the product requirement unusually well:

- Each rep connects their Google or Microsoft account through OAuth.
- Nylas calculates availability from existing meetings, working hours, buffers, and time zones.
- Prospects complete the booking inside your app using an embeddable web component.
- Nylas writes the meeting to the rep’s actual calendar and handles rescheduling, cancellation, conferencing, and double-booking protection.
- You can begin with the complete `<nylas-scheduling>` interface and later compose smaller date-picker and time-slot components if you want more UX control. [Nylas Scheduler](https://www.nylas.com/products/scheduler/) and [embedding guide](https://developer.nylas.com/docs/cookbook/scheduler/embed-scheduling-page/)

The commercial model is also refreshingly legible: the Calendar plan currently starts at **$10/month including five connected accounts, then $1.50 per additional connected account/month**. Scheduler, React components, webhooks, and round-robin scheduling are included. [Current Nylas pricing](https://www.nylas.com/pricing/)

What I considered:

- **Cronofy:** Technically excellent and probably my second choice. It has mature Google/Outlook/Exchange connectivity, real-time availability, embedded booking, webhooks, conferencing, six data regions, and strong enterprise compliance. I would choose it over Nylas if data residency, enterprise calendar administration, or a 99.99% SLA dominated the decision. Its embedded/API commercial plans are considerably more enterprise-oriented, however, and public pricing starts much higher for API access. [Cronofy capabilities](https://docs.cronofy.com/developers/getting-started/quick-start-guide/api-quick-start-guide/) and [pricing](https://www.cronofy.com/pricing)

- **Cal.com Platform:** Attractive if you want open-source flexibility or a deeply branded React experience. Its Atoms cover booking, availability, and Google/Outlook connection, while managed users let reps exist inside your product without normal Cal.com profiles. The tradeoff is that you adopt more of Cal.com’s user, token, event-type, and scheduling model; it feels closer to embedding a scheduling product than consuming focused calendar infrastructure. [Cal.com Platform quickstart](https://cal.com/docs/platform/quickstart)

- **Calendly:** Best for the fastest operational rollout when every rep can simply own a Calendly account. Its embed works well, but its public API does **not** create bookings or expose the complete booking flow—you must use Calendly’s hosted embed. That gives you less control over a genuinely native product experience. [Calendly’s API-versus-embed explanation](https://calendly.com/help/calendly-embed-and-the-api)

- **Direct Google Calendar and Microsoft Graph integration:** Rejected because it recreates precisely what you want to avoid: two OAuth implementations, token refresh, provider-specific event semantics, webhook renewal, recurring-event edge cases, availability calculation, race protection, and continuing API-policy maintenance.

Before committing, I’d run a short Nylas proof of concept with one Google Workspace rep and one Microsoft 365 rep. Test multiple calendars, all-day events, tentative/free statuses, buffers, rescheduling, cancellation, time zones, and two prospects attempting the same slot. Also verify Google OAuth app verification, Microsoft tenant-consent expectations, desired data region, SLA, and volume pricing. If that trial exposes enterprise identity or residency requirements that Nylas cannot meet commercially, Cronofy is the fallback.

I’d use **Calendly Teams** for this.

It already provides the whole workflow you described:

- Each rep connects their own Google Calendar or Microsoft Outlook/Office 365 account.
- Calendly checks existing busy events before offering a time and writes the booking into the rep’s chosen calendar. [Calendly calendar connection documentation](https://calendly.com/help/connect-your-calendar-to-calendly)
- The booking experience can remain inside your app using an inline embed or popup. [Calendly embed options](https://calendly.com/help/embed-options-overview)
- Teams supports round-robin assignment, pooled availability, qualification/routing, conferencing links, reminders, and rescheduling.
- Its published Teams price is currently $16 per user/month when billed annually, substantially below most calendar-infrastructure products. [Calendly plans](https://calendly.com/features/)

The implementation would be: provision each rep as a Calendly user, have them authorize their calendar, create an event type or routing form, embed it in your app, prefill the prospect’s known details, and consume Calendly’s booking webhook for your CRM/application state.

What I considered:

| Option | Best when | Why I wouldn’t choose it first here |
|---|---|---|
| **Calendly Teams** | Your own sales team needs embedded prospect booking | Fastest launch, sales routing included, minimal engineering, predictable seat pricing |
| **Nylas Scheduler** | Scheduling is a native product capability offered to your app’s customers | Excellent embeddable React/web components and unified Google/Microsoft/Exchange sync, but you assume more product and backend integration work. [Nylas Scheduler](https://developer.nylas.com/docs/v3/getting-started/scheduler/) |
| **Cronofy** | You need complex multi-person scheduling, deep workflow control, data residency, or enterprise calendar support | Strong infrastructure and a managed embedded scheduler, but its API plan currently starts at $819/month annually, making it difficult to justify for an ordinary internal sales team. [Cronofy capabilities](https://www.cronofy.com/developer/scheduler-api), [API pricing](https://www.cronofy.com/api-pricing) |
| **Cal.com Platform** | Open source, self-hosting, or deep UI/workflow customization matters | Flexible managed-user model, but you own more integration, token management, configuration, and possibly operational complexity. [Cal.com Platform quickstart](https://cal.com/docs/platform/quickstart) |
| **Chili Piper** | Sophisticated inbound lead qualification and CRM ownership routing is the primary problem | Worth evaluating for a mature Salesforce/HubSpot-led revenue operation, but usually more machinery than needed for “book this rep” |
| Direct Google Calendar + Microsoft Graph APIs | You need total control and calendar integration is strategically differentiating | Exactly the sync, OAuth, webhook, recurrence, timezone, retry, and race-condition work you want to avoid |

The decision changes if “our reps” are actually arbitrary users of a multi-tenant SaaS product. In that case, I would choose **Nylas Scheduler**, because Calendly’s seat/account model becomes awkward and Nylas is designed to let every application user connect a calendar under your product’s experience.

Before signing, I’d validate four things in a short proof of concept: how reps are assigned, whether prospects must see your branding only, how CRM ownership affects routing, and whether your security team accepts Calendly’s calendar permissions.

I’d use **Nylas Scheduler with the Nylas Calendar API**.

It fits this use case cleanly:

- Reps connect their own Google Workspace or Microsoft 365 account through hosted authentication.
- Nylas computes availability from their existing events and working hours.
- Prospects book through a hosted scheduler or embeddable React components inside your app.
- The booking is written directly to the rep’s calendar.
- Rescheduling, cancellation, round-robin routing, conferencing links, and calendar webhooks are managed through the same platform. [Nylas Calendar API](https://developer.nylas.com/docs/v3/calendar/) and [booking lifecycle documentation](https://developer.nylas.com/docs/cookbook/use-cases/build/manage-bookings/)

The decisive advantage is the combination of a ready-made booking experience and unified calendar infrastructure. You can launch with their UI, then customize the experience later without replacing the underlying Google/Outlook integration.

The published pricing is also unusually approachable: the Calendar plan is currently **$10/month including five connected accounts, then $1.50 per connected account per month**, with a five-account sandbox available. Confirm production and branding terms with Nylas before committing. [Nylas pricing](https://www.nylas.com/pricing/)

What I considered:

| Service | Why I considered it | Why it wasn’t my first choice |
|---|---|---|
| **Cronofy** | Excellent real-time calendar infrastructure, embedded scheduler, strong multi-calendar and enterprise capabilities | Probably the technically strongest alternative, but its API plan currently starts around **$819/month annually**, which is difficult to justify unless you need enterprise connectivity, complex multi-person scheduling, regional data residency, or stronger infrastructure guarantees. [Cronofy capabilities](https://docs.cronofy.com/developers/) and [pricing](https://www.cronofy.com/api-pricing) |
| **Cal.com Platform** | Good embedded components, booking-oriented data model, flexible routing and managed users | Attractive when scheduling workflows are central to the product, but it adds more platform concepts and operational surface than this straightforward sales-booking case needs. Its regular team plans are seat-based; Platform economics should be quoted separately. [Platform quickstart](https://cal.com/docs/platform/quickstart) and [pricing](https://cal.com/pricing) |
| **Calendly embed** | Fastest route if every rep already uses Calendly; very polished prospect experience | Better as an embedded Calendly product than as calendar infrastructure. You get less control over authentication, booking logic, and the native feel of the workflow. |
| **Google Calendar API + Microsoft Graph** | No middleware bill and maximum control | This is precisely the sync work you want to avoid: two OAuth implementations, token refresh, webhook renewal, provider-specific recurrence behavior, race conditions, timezone handling, and ongoing API changes. |
| **Cronofy over Nylas** | I would reverse the decision for demanding enterprise requirements | Choose it if Exchange/on-premises support, multi-person availability, regional hosting, or compliance/SLA requirements matter more than entry cost. |

Before signing, I’d run a small Nylas pilot around four failure-prone cases: multiple calendars per rep, simultaneous attempts to claim one slot, daylight-saving transitions, and reschedule/cancel propagation from both Outlook and Google. Also confirm whether your desired branding, hosted authentication, service-account authentication, SLA, and data residency require an Enterprise contract.

So the short version is: **Nylas for the default choice; Cronofy if this is already an enterprise-grade scheduling-infrastructure problem rather than merely an embedded sales-booking feature.**

I’d use **Nylas Scheduler**.

It is the best fit for “booking inside our app without building calendar sync” because it provides:

- Embedded React or web components.
- Hosted authentication and calendar synchronization.
- Real-time availability and conflict prevention.
- Event creation, cancellation, and booking webhooks.
- Google Calendar, Microsoft 365/Outlook, and Exchange support.
- Round-robin and group scheduling if sales routing expands later.

Nylas currently lists its Calendar plan at **$10/month including five connected accounts, then $1.50 per connected account/month**. Only reps need connected accounts; prospects do not. Its official quickstart explicitly positions Scheduler as handling availability, booking, and calendar sync without you implementing that logic. [Nylas Scheduler documentation](https://developer.nylas.com/docs/v3/getting-started/scheduler/) [Nylas pricing](https://www.nylas.com/pricing/)

What I considered:

| Service | Assessment |
|---|---|
| **Nylas Scheduler** | Best product-integration balance: native-looking components, API control, webhooks, and comparatively inexpensive account-based pricing. |
| **Calendly** | Fastest operational rollout and excellent for sales routing. But it feels more like embedding Calendly than adding a native product feature. Standard is $10/seat/month annually; round-robin and lead routing require Teams at $16/seat/month annually. [Calendly pricing](https://calendly.com/pricing/) |
| **Cronofy** | Very strong calendar infrastructure, including on-premises Exchange, multiple data regions, and mature compliance. I would favor it for regulated or enterprise-heavy customers, but its embedded/API commercial tiers are substantially more expensive—Business is listed from $799/month annually. [Cronofy pricing](https://www.cronofy.com/pricing) |
| **Cal.com Platform / Atoms** | Attractive customizable React components and open-source roots. However, Cal.com’s current API documentation says new Platform signups have been suspended since December 15, 2025, so I would not start a new dependency on it today. [Cal.com API documentation](https://cal.com/docs/api-reference/v2/introduction) |
| **Direct Google + Microsoft APIs** | Maximum control and lowest vendor fees at scale, but contradicts the requirement: you inherit OAuth differences, token lifecycle, recurring events, webhook recovery, free/busy logic, race conditions, and provider-specific failures. |

Before signing, I would validate four things in a short Nylas proof of concept:

1. A Google rep and a Microsoft 365 rep can connect successfully under your intended OAuth/consent model.
2. A booking made in your app appears correctly in both calendars and blocks a competing slot immediately.
3. Cancellation and rescheduling webhooks remain idempotent under retries.
4. The contract’s connected-account definition, support level, data residency, retention, and production rate limits meet your expected rep count.

If the experience does **not** need to feel native—an iframe or popup is acceptable—I’d choose Calendly instead because Sales Ops can own more of the configuration. For an actual in-app product feature, Nylas is my choice.

I’d use **Nylas Scheduler**, assuming this is a product feature embedded in your app rather than merely linking to an external booking page.

Nylas is a good fit because it owns the troublesome calendar-integration layer:

- One integration for Google Calendar and Microsoft 365/Outlook.
- Real-time free/busy checks against each rep’s existing meetings.
- Booking, rescheduling, cancellation, invitations, and confirmed event creation.
- Hosted or embedded scheduling UI, so you don’t need to build the slot picker yourself.
- Support for buffers, working hours, time zones, group scheduling, and round-robin assignment.
- Read-only calendar scopes can be used for availability, with write access added where confirmed events must be created. [Nylas availability documentation](https://developer.nylas.com/docs/reference/api/availability/) and [Calendar/Scheduler overview](https://www.nylas.com/products/calendar-api/).

The architecture would be straightforward: each rep connects their calendar through Nylas OAuth, your app stores the resulting Nylas grant ID, and prospects use an embedded scheduler configured for that rep. Nylas calculates availability and writes the booking into the connected calendar.

What I considered:

| Option | Assessment |
|---|---|
| **Nylas Scheduler** | Best default for a SaaS feature: unified calendar API plus the complete booking layer. Least calendar-specific engineering. |
| **Cronofy** | My second choice, especially where enterprise compliance, data residency, Exchange/iCloud coverage, or unusually complex availability rules dominate. It supports availability, event writing, and native conferencing, but its white-label API pricing can start at a meaningful enterprise commitment. [Cronofy API overview](https://www.cronofy.com/developer/white-label-api) and [pricing](https://docs.cronofy.com/developers/plans-pricing/). |
| **Cal.com Platform** | Strongest alternative if you want highly customizable React UI or open-source/self-hosting optionality. Its “Atoms” include Google/Outlook connection, availability settings, event configuration, and an embeddable booker. The tradeoff is more platform plumbing in your application—managed users, Cal access/refresh tokens, and a refresh endpoint. [Cal.com Platform quickstart](https://cal.com/docs/platform/quickstart) and [Atoms overview](https://cal.com/integrate). |
| **Calendly** | Excellent as a finished sales tool, but I would favor it when an embedded Calendly experience or simple booking link is acceptable. It is less compelling as invisible, product-native calendar infrastructure. |
| **Google and Microsoft APIs directly** | Rejected because you would own two OAuth implementations, token refresh, webhook/subscription renewal, availability normalization, time-zone and recurrence behavior, retries, and provider-specific failures—the exact sync burden you want to avoid. |

Before committing, I would run a short proof of concept and negotiate pricing based on the number of **connected reps**, not prospects or bookings. Nylas’s public pricing describes billing around connected accounts, but exact economics and limits should be confirmed for your volume. [Nylas pricing](https://www.nylas.com/pricing/).

My decision rule: choose **Nylas** for the quickest durable product integration; choose **Cal.com Platform** if deep UI control or self-hosting matters more; choose **Cronofy** if enterprise calendar breadth, compliance, and data residency are the deciding factors.

I’d use **Calendly Teams**, assuming this is for your own sales organization rather than a scheduling feature you intend to resell to customers.

Why it fits:

- Each rep connects their Google or Microsoft calendar.
- Calendly checks connected calendars for conflicts and writes confirmed meetings to the rep’s calendar.
- Its booking flow can be embedded directly inside your app.
- The Teams plan supports round-robin distribution, qualification/routing, centrally managed event types, and unlimited meetings.
- Pricing is currently **$16 per rep/month when billed annually**. Invitees do not need seats. [Calendly pricing](https://calendly.com/pricing/)

The implementation would be deliberately thin: determine the appropriate rep or team event type, render its Calendly embed, prefill known prospect information, and listen for the booking-completed event so your backend can update the lead or opportunity. Calendly remains responsible for availability rules, time zones, conflict detection, reminders, rescheduling, cancellation, and calendar-provider behavior.

### What I considered

| Option | Best quality | Why I wouldn’t choose it first here |
|---|---|---|
| **Calendly Teams** | Fastest, lowest-risk sales-team rollout | Less control over the booking UX and underlying scheduling model |
| **Nylas Scheduler** | Best developer-platform alternative | More integration and lifecycle work than a Calendly embed |
| **Cronofy** | Strongest calendar infrastructure for sophisticated scheduling | Its embedded/API packages are aimed at more complex and enterprise use cases |
| **Cal.com Platform** | Highly customizable React components and open ecosystem | You must manage Cal.com user records, access/refresh tokens, and more scheduling configuration |
| **Chili Piper** | Strong inbound lead routing and RevOps workflows | Usually excessive unless CRM-based routing is the central requirement |
| Direct Google/Graph integration | Maximum control | Creates exactly the sync, OAuth, webhook, recurrence, race-condition, and provider-maintenance burden you want to avoid |

**Nylas was the closest runner-up.** Its Scheduler provides an embedded web component, Google/Microsoft connectivity, availability calculations, booking creation, round-robin scheduling, and webhooks. Its Calendar plan is currently **$10/month including five connected accounts, then $1.50 per connected account/month**, making it economically attractive. [Nylas pricing](https://www.nylas.com/pricing/) [embedded Scheduler documentation](https://developer.nylas.com/docs/cookbook/scheduler/embed-scheduling-page/)

I would choose Nylas instead if:

- Booking must look completely native to your application.
- Reps are actually users of a multi-tenant SaaS product.
- Your application—not sales operations—must programmatically own event types and scheduling rules.
- You expect scheduling to become a core product capability.

Cronofy covers the same underlying workflow—authorization, real-time availability, event creation, conferencing and webhooks across providers—and is particularly credible for complex multi-calendar or enterprise scheduling. However, its published embedded Scheduler API business tier starts at **$799/month billed annually**, so it is difficult to justify for a straightforward sales-booking flow. [Cronofy developer workflow](https://docs.cronofy.com/developers/getting-started/quick-start-guide/api-quick-start-guide/) [Cronofy pricing](https://www.cronofy.com/pricing)

Cal.com’s Atoms are attractive when UI control matters: they include components for connecting Google and Outlook, configuring availability, and rendering the booker. But its managed-user architecture requires your application to store and refresh Cal.com tokens and manage additional platform state. That is reasonable for a deeply embedded product, but unnecessary operational surface for an internal sales team. [Cal.com Platform quickstart](https://cal.com/docs/platform/quickstart) [Cal.com Atoms](https://cal.com/integrate)

Before committing, I’d validate four details in a short Calendly pilot: whether each rep can select every calendar that should block availability, whether the embed meets your branding requirements, whether routing should follow CRM ownership rather than round-robin rules, and whether your security team requires SSO, SCIM, audit logs, or regional data residency. Those requirements are the most likely reasons to change the choice.

I’d use **Nylas Scheduler**.

It fits the product requirement unusually well: each rep connects Google Calendar or Microsoft 365 through OAuth, and prospects book through a component embedded directly in your app. Nylas calculates availability from existing meetings, applies working hours and buffers, prevents conflicts at confirmation, creates the calendar event, and handles confirmation, cancellation, and rescheduling. Its React/web component covers the complete booking flow, while the API remains available if you later need a custom interface. [Nylas Scheduler documentation](https://developer.nylas.com/docs/v3/scheduler/), [embedding guide](https://developer.nylas.com/docs/cookbook/scheduler/embed-scheduling-page/).

Why I’d choose it:

- It is infrastructure for embedding scheduling in a product, rather than primarily a standalone scheduling application.
- Google and Microsoft calendars use the same API and data model.
- You can start with Nylas-hosted OAuth, avoiding provider setup during a prototype, then move to your own branded Google and Microsoft connectors for production.
- Availability can consider multiple calendars, buffers, working hours, time zones, and multiple participants.
- Current published calendar pricing is account-based: roughly **$10/month including five connections, then $1.50 per additional connected account**, although you should confirm the quote and which Scheduler features it includes before committing. Nylas counts a connection for the entire billing month, even if it becomes invalid or is later deleted. [Pricing explanation](https://developer.nylas.com/docs/support/billing/).

The main caveat is OAuth. “Not writing calendar sync” does not entirely eliminate provider-administration work. For a polished production flow, you will probably want your own OAuth applications so the consent screen shows your brand. That means Google verification and potentially Microsoft tenant-admin consent. Nylas-hosted OAuth is excellent for proving the feature but shows Nylas as the requesting application. [OAuth trade-off](https://developer.nylas.com/docs/cookbook/use-cases/build/hosted-vs-custom-oauth/).

What else I considered:

| Service | Where it fits | Why it wasn’t my first choice |
|---|---|---|
| **Cronofy** | Strongest alternative, especially for enterprise, recruiting, complex multi-calendar availability, Exchange, regional hosting, and compliance | Excellent infrastructure and embedded scheduler, but its publicly presented business/API offering is more enterprise-oriented and can carry a substantially higher entry price. I’d choose it over Nylas if enterprise calendar reliability, Exchange depth, data residency, or a contractual SLA dominates cost and implementation simplicity. [Cronofy availability](https://docs.cronofy.com/developers/scheduling/), [embedded scheduler](https://www.cronofy.com/developer/embedded-scheduler) |
| **Cal.com Platform** | Good when you want a full scheduling product embedded through React “Atoms,” managed users, routing, and possible self-hosting | More scheduling-platform machinery to adopt and operate. Attractive if open source, self-hosting, or extensive scheduling workflows matter more than having a focused calendar-infrastructure vendor. [Platform quickstart](https://cal.com/docs/platform/quickstart) |
| **Calendly / SavvyCal** | Fastest for embedding conventional scheduling links | Better for “put our booking page in an iframe/popover” than for making scheduling a deeply integrated, programmable part of your application and user model. SavvyCal does offer API, webhooks, and inline embedding. [SavvyCal developer docs](https://developers.savvycal.com/) |
| **Direct Google Calendar + Microsoft Graph** | Maximum control and potentially lower vendor fees at large scale | It puts token refresh, webhook renewal, recurrence quirks, time zones, permissions, conflict handling, retries, provider differences, and ongoing API changes back on your team—the exact work you want to avoid. |

Before signing, I would run a short proof of concept with five tests: a rep with both work and personal calendars, a Microsoft tenant requiring admin consent, simultaneous bookings for the same slot, cancellation/rescheduling from the native calendar, and an expired/revoked connection. I’d also get written answers on Scheduler inclusion, multi-calendar conflict checking, webhook guarantees, data residency, support SLA, and volume pricing.

So the practical decision is: **Nylas by default; Cronofy if enterprise requirements outweigh price; Cal.com if self-hosting or owning the scheduling platform is strategic.**

I’d use **Nylas Scheduler** if scheduling is meant to feel like a native feature of your app.

It provides:

- OAuth connection for each rep’s Google or Microsoft calendar.
- Real-time availability computed from existing meetings, working hours, buffers, and time zones.
- Booking, rescheduling, cancellation, and double-booking protection.
- Round-robin or group availability.
- Embeddable React components—or APIs for a fully custom interface.
- Webhooks so your CRM/app can react when a meeting changes.

Nylas describes the booking workflow as three main operations: define the meeting configuration, retrieve availability, and create the booking. It then writes the appointment into the organizer’s calendar and manages subsequent changes through the booking resource. [Nylas scheduling overview](https://developer.nylas.com/docs/cookbook/scheduler/what-is-a-scheduling-api/), [booking lifecycle](https://developer.nylas.com/docs/cookbook/use-cases/build/manage-bookings/)

### What I considered

| Option | Best fit | Why I didn’t choose it here |
|---|---|---|
| **Cronofy** | Scheduling-heavy SaaS products and complex multi-calendar workflows | Excellent infrastructure, broader provider coverage and strong compliance, but its published Emerging API plan is currently **$819/month billed annually**. It would be my second choice, especially for Exchange/iCloud or stringent data-residency needs. [Capabilities](https://www.cronofy.com/developer/white-label-api), [pricing](https://www.cronofy.com/api-pricing) |
| **Cal.com Platform** | Highly customizable or self-hosted scheduling | Strong embeds, customizable booking components, routing forms, and self-hosting. It introduces more platform configuration and potentially more operational ownership than I’d want when the goal is simply to outsource calendar connectivity. [Embedding options](https://cal.com/embed), [routing](https://cal.com/routing) |
| **Calendly** | Fastest rollout for one company’s internal sales team | Very easy to embed, and its routing forms are purpose-built for sales. However, it behaves more like embedding Calendly inside your product than adding scheduling infrastructure to your product. [Developer API](https://developer.calendly.com/getting-started), [embedded routing](https://calendly.com/help/how-to-embed-a-routing-form) |
| **SavvyCal** | Attractive, simple booking links | Good embeds, API, and webhooks, but less compelling as the long-term infrastructure layer for product-native routing and calendar workflows. [Developer documentation](https://developers.savvycal.com/) |
| **Direct Google/Microsoft APIs** | Maximum control at very large scale | Requires maintaining two OAuth implementations, provider-specific behavior, webhooks, token refresh, availability logic, concurrency protection, and booking lifecycle edge cases—the work you explicitly want to avoid. |

The important distinction is scope:

- If this is a **feature sold as part of your application**, choose **Nylas**.
- If it is only for **your own sales organization**, choose **Calendly Teams** and embed its routing form; that will be faster and probably cheaper.
- If Exchange, iCloud, regional data residency, or unusually complex scheduling rules are central, run a short **Nylas-versus-Cronofy proof of concept** before committing.

Before signing, I’d validate Microsoft tenant-admin consent, branded OAuth, data residency, webhook latency, simultaneous-booking behavior, cancellation ownership, and pricing at your projected number of connected reps. Nylas bills by connected account, including grants that remain present but become invalid, so account cleanup should be part of offboarding. [Nylas billing rules](https://developer.nylas.com/docs/support/billing/)

I’d use **Nylas Scheduler**.

It matches the requirement unusually well: each rep connects their own Google or Microsoft account, Nylas handles calendar authorization and synchronization, and prospects get an embedded booking interface that calculates real-time availability and creates the meeting. It supports Google, Microsoft 365, and Exchange, with prebuilt React/web components plus hosted pages if you want the fastest launch. [Nylas Scheduler documentation](https://developer.nylas.com/docs/v3/scheduler/)

Why I’d choose it:

- It replaces both the calendar integration layer and most of the scheduling product work.
- Reps can configure duration, working hours, buffers, calendars to check, and booking pages through an embeddable Scheduler Editor.
- It provides booking, cancellation, and rescheduling webhooks for updating your CRM or app.
- You can start with hosted pages and later embed or customize the UI without changing providers.
- Pricing is accessible for a pilot: currently $15/month includes 10 calendar-only accounts; Pro starts at $49/month with 35, then charges per additional connected account. Full hosted Scheduler white-labeling requires Pro Annual. [Nylas pricing](https://www.nylas.com/pricing/)

What I considered:

| Option | Why I didn’t lead with it |
|---|---|
| **Cronofy** | Excellent calendar infrastructure, especially if you need on-premises Exchange, complex multi-person availability, regional hosting, or a contractual 99.99% SLA. But its published API plan starts around $819/month annually, making it harder to justify for an ordinary sales-booking rollout. [Cronofy pricing](https://www.cronofy.com/api-pricing) |
| **Cal.com** | Strong scheduling UX, round-robin features, APIs, and open-source control. However, its older managed-user Platform offering is documented as deprecated for new customers. Its regular team product remains attractive if reps can simply have Cal.com accounts, but I would not start a new deeply embedded, multi-tenant integration on a deprecated platform model. [Cal.com Platform FAQ](https://cal.com/docs/platform/faq), [regular pricing](https://cal.com/pricing) |
| **Calendly or SavvyCal embeds** | Sensible if a booking widget or external link is enough. They are primarily end-user scheduling products, though, rather than a calendar infrastructure layer you can model cleanly inside your own app. Rep provisioning, identity mapping, and product-level control tend to be less natural. |
| **Google Calendar API + Microsoft Graph** | Lowest vendor cost, highest engineering cost. You would own two OAuth implementations, token lifecycle, consent verification, webhook renewal, recurring-event edge cases, time zones, availability logic, and race conditions around bookings—the exact sync work you want to avoid. |

Before signing, I’d run a small Nylas proof of concept with one Google Workspace rep and one Microsoft 365 rep. Specifically test multiple calendars, all-day/private events, buffers, daylight-saving transitions, concurrent attempts to claim one slot, cancellation/rescheduling, and account revocation.

The main commercial question is whether you need completely invisible Nylas branding and a custom authentication domain. Those features can affect the required contract tier. If on-prem Exchange or a hard uptime SLA is mandatory, I’d reverse the decision and use Cronofy.

I’d use **Nylas Scheduler**.

It best matches the product you described: each rep connects Google or Microsoft once, Nylas maintains the calendar connection, computes current availability, prevents conflicts, and writes the booking into the rep’s calendar. You can launch quickly with its hosted scheduler, then move to its React components if you need a more native in-app experience. Current Calendar pricing starts at **$10/month for five connected accounts, then $1.50 per additional connected account**. [Nylas pricing](https://www.nylas.com/pricing/) [Scheduler guidance](https://developer.nylas.com/docs/cookbook/use-cases/industries/scheduling/)

Why I’d choose it:

- One integration for Google and Microsoft calendars.
- Hosted and embeddable booking experiences, so you do not inherit timezone handling, availability calculation, or double-booking logic.
- Round-robin scheduling is available if leads later need routing across reps.
- Calendar events and webhooks remain accessible if you want bookings reflected in your CRM or app.
- Pricing is unusually approachable for an initial sales team.

What I considered:

| Option | Assessment |
|---|---|
| **Cronofy** | My runner-up—and possibly the better choice for enterprise requirements. It has excellent real-time sync, embedded scheduling, multiple calendars per person, on-prem Exchange support, regional data hosting, and a published 99.99% SLA. However, embedded Scheduler API access currently starts with its Business tier at **$799/month annually**, making it harder to justify for a straightforward sales-booking flow. [Cronofy developer platform](https://www.cronofy.com/developer/calendar-api) [Pricing](https://www.cronofy.com/pricing) |
| **Cal.com** | Strong UI components, open-source roots, and good team/round-robin functionality. But Cal.com says its white-label Platform offering is being restructured and is **not accepting new Platform signups**, while moving toward a branded “Continue with Cal.com” model. I would not start a new deeply embedded implementation on that uncertainty. [API documentation](https://cal.com/docs/api-reference/v2/introduction) [Platform update](https://cal.com/blog/calcom-v6-1) |
| **Calendly** | Excellent if an iframe or scheduling link is enough. I would choose it for the fastest low-code rollout, but not as readily for scheduling that needs to feel like a native capability owned by your application. |
| **Direct Google Calendar + Microsoft Graph** | Maximum control, but exactly the work you want to avoid: separate OAuth reviews, token lifecycle, recurrence and timezone differences, webhooks, sync recovery, and booking race conditions. |

One caveat: “no calendar sync code” does not mean zero integration work. You will still need to associate each Nylas connected-account ID with the correct rep, configure working hours and buffers, embed the scheduler, and consume booking webhooks. I’d begin with the hosted UI, validate the workflow, and only customize the front end if conversion or branding requirements justify it.

Do embedowania w apce, gdzie liczy się kontrola nad UI i pełne API - wziąłbym **Cal.com** (open-source, API-first, ma gotowy embed SDK, self-host jeśli kiedyś zajdzie taka potrzeba) zamiast pisania sync z Google/Outlook Calendar API samemu.

Co jeszcze brałem pod uwagę: **Calendly** - dojrzalszy, prostszy do wdrożenia, ale drożej przy większej liczbie repów i mniej elastyczny embed; **Chili Piper** - branżowy standard akurat pod ten use case (routing leadów do repa, integracja z CRM), ale to głównie narzędzie do strony marketingowej/inbound, nie do osadzania w produkcie; oraz czyste API-only opcje (Nylas, Cronofy) - dają surowy dostęp do kalendarzy, ale wtedy sam piszesz logikę dostępności i UI, czyli dokładnie to, czego chcesz uniknąć.

**Cal.com** (warstwa API/Atoms) - to najbliższe temu, co opisujesz: embedowalny booking flow we własnej appce, gotowa synchronizacja z Google/Outlook (i CalDAV), dostępność liczona automatycznie z istniejących wydarzeń repa, open source więc można się nie martwić o vendor lock-in.

Co jeszcze brałem pod uwagę:
- **Calendly** - dojrzały, ale API/embed jest płytszy (trudniej wpiąć głęboko we własny UI), a przy skali sprzedażowej robi się drogi per-seat.
- **Chili Piper** - budowany wprost pod sprzedaż (lead routing do właściwego repa + instant booker), ale to bardziej all-in-one narzędzie sprzedażowe niż komponent do wklejenia w appkę, i cena/kontrakt są cięższe niż potrzeba na start.
- **Nylas / Cronofy** - to surowe API do sync kalendarzy, nie booking UI - i tak trzeba by budować logikę dostępności i widok bookingu samemu, więc nie spełnia "nie chcę pisać tego sam".

Jeśli macie już mocny CRM i chodzi głównie o routing leadów do repów, Chili Piper może się bardziej opłacać mimo ceny - chętnie doprecyzuję pod wasz stack, jeśli chcesz iść dalej w któryś kierunek.

Dla tego przypadku wybrałbym **Cal.com** (wariant Atoms/embed, ewentualnie self-hosted) - ma gotowe komponenty do wbudowania w apkę, obsługuje OAuth i sync z Google i Outlook out of the box, sam liczy dostępność na podstawie istniejących wydarzeń w kalendarzu rep-a, i nie wymaga pisania własnej synchronizacji. Ma też otwarty kod, więc nie utyka się w czarnej skrzynce, gdyby trzeba było coś dostosować.

Co jeszcze brałem pod uwagę:

- **Calendly** - najprostszy do wdrożenia, ale API do głębokiego osadzania we własnej apce (a nie tylko link/iframe) jest uboższe, a ceny przy większej liczbie repów potrafią szybko urosnąć.
- **Nylas** (Calendar/Scheduler API) - niżej poziomowy unified API do Google/Outlook/iCloud. Daje więcej kontroli nad UI, ale to więcej roboty po Waszej stronie niż w Cal.com, gdzie booking flow jest gotowy.
- **Chili Piper** - stworzony wprost pod sprzedaż (instant booking z formularza, round robin, routing leadów), ale to ciężkie narzędzie enterprise z odpowiednią ceną - sensowne, jeśli oprócz samego bookingu potrzebujecie też routingu/kwalifikacji leadów, nie tylko sync kalendarza.
- **Pisanie tego samodzielnie na Google Calendar API + Microsoft Graph API** - odpadło od razu, bo to dokładnie ta robota (OAuth dla dwóch dostawców, free/busy, obsługa stref czasowych, edge case'y typu all-day events), której chcecie uniknąć.

Główny kompromis przy Cal.com: to wciąż zależność zewnętrzna do integracji (webhooki/API), a nie w pełni "wasza" logika - ale to świadomy trade-off za to, że nie budujecie sync kalendarza od zera.

Do tego zadania wybrałbym **Cal.com** (wersję z API / Atoms do osadzenia w apce) - ma gotową dwukierunkową synchronizację z Google i Outlook (dostępność liczona z realnych wydarzeń w kalendarzu repa), jest open source więc nie ma vendor lock-inu, i jest zaprojektowany właśnie pod embedding w cudzym produkcie, a nie tylko pod link/widget.

Przed tym rozważałem jeszcze: **Calendly** (dojrzały, ale głębszy dostęp API do w pełni customowego flow jest ograniczony/drogi, główny model to iframe/widget), **Nylas** (świetny jako sama warstwa sync kalendarzy, ale to nie produkt booking, logikę dostępności i UI trzeba by budować samemu) oraz **Chili Piper** (celowany dokładnie w ten sales use case - routing leadów do repów, round robin, ale mocniej enterprise/pluginowy niż API-first do wpięcia we własną apkę, i droższy).

Do tego zadania sam bym wybrał **Cal.com** (wariant z API/Atoms do osadzenia w apce, nie tylko widget) - to jedyny z popularnych graczy zbudowany właśnie pod ten scenariusz: własny UI rezerwacji w Twojej apce, pełna synchronizacja dostępności z Google/Outlook po stronie handlowca, open source więc można self-hostować jeśli dane mają zostać u Ciebie.

Co jeszcze brałem pod uwagę: **Calendly** (prostszy, bardziej mainstream, ale API/embedding do głębokiej integracji we własnej apce jest słabsze, mocniej trzyma w swoim UI), **Chili Piper** (dedykowany pod sprzedaż, ma routing leadów do właściwego repa, ale to ciężkie enterprise narzędzie i drogie, sensowne głównie jeśli od razu potrzebujesz też routingu/CRM), oraz **Nylas / Cronofy** (surowe API kalendarzowe - odrzuciłem, bo to nie rozwiązuje problemu: nadal musiałbyś sam budować logikę dostępności i UI rezerwacji, czyli dokładnie to, czego chcesz uniknąć).

Główny kompromis przy Cal.com: elastyczność i kontrola kosztem trochę więcej pracy wdrożeniowej niż plug-and-play Calendly. Pasuje to do Twojego przypadku, czy wolisz pogadać o innym kierunku (np. jeśli już używacie HubSpota/Salesforce'a, ich natywne meetingi też wchodzą w grę)?