How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Cal.com gives the best balance of a documented API, webhooks, embeds and price for teams building booking into their own product.
- Nylas and Cronofy are infrastructure APIs built for products that manage many connected calendars, not simple booking pages.
- Calendly and YouCanBookMe are strong booking products, but their APIs sit behind paid plans and Calendly keeps API access off its free plan.
- Acuity Scheduling, SimplyBook.me and Appointlet can work for booking flows, but check which plan unlocks the API before you commit.
- Always model cost on your real volume, because per-seat, per-account and per-booking pricing scale in very different ways.
What should a scheduling API let your product do
A good scheduling API should let your product check availability, create and cancel bookings, manage event types and send webhook notifications without forcing users back to the vendor booking page. It should expose availability as a first class endpoint, return clear error codes, and support time zones, buffers, round robin assignment and cancellation rules.
How much does a scheduling API cost at real volume
Per-seat pricing, used by Cal.com and Calendly, grows with your team and stays predictable when each seat books a lot. Per-account pricing, used by Nylas and Cronofy, grows with every connected calendar your customers link, so a product with thousands of end users can outgrow a low entry price fast. Per-booking pricing, used by SimplyBook.me, grows with transaction volume and suits seasonal businesses. Before you choose, model three numbers: seats on your team, connected calendars, and bookings per month.
Should you embed a booking page or build the interface yourself
Embedding a vendor booking page is the fastest route to a working product, and most tools in this guide offer an embed or a JavaScript component. It suits teams that need booking live in days and can accept the vendor design. Building your own interface on the API gives full control over branding, flow and data, but it means owning availability logic, time zone handling, confirmation emails and edge cases such as double booking. Nylas, Cronofy and Cal.com support the build-it-yourself route best, because their APIs expose availability and scheduling as separate calls.
What should you check in the docs before you commit
Read the API reference for availability, booking, cancellation, webhooks and authentication before you sign up. Look for SDKs in your stack, an OpenAPI file, a changelog with recent dates, and a status page with real incident history. Test the OAuth flow end to end, because calendar owners must grant access and a clumsy consent screen will hurt adoption. Confirm whether API keys are scoped narrowly or grant full account access, and whether webhooks are signed and retried.
We picked tools with a real developer API or a documented webhook surface, a working vendor homepage confirmed on 12 November 2026, and a public pricing page. Prices below come from vendor pricing pages checked on 12 November 2026, or from third-party reports of those pages where the vendor page did not render a figure in text. Where a price is quote-only or only reported by third parties, we say so in that tool section. Last verified 12 November 2026.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Cal.com | Teams embedding booking into their own product with a full API | $12 per user per month billed annually on the Teams plan | Yes, free for 1 user with unlimited event types and calendars |
 Calendly | Products that need a proven booking link and a stable scheduling API | $10 per seat per month billed annually on the Standard plan | Yes, 1 event type and 1 calendar connection |
 Nylas | Products that need calendar, email and scheduling through one unified API | $15 per month on the Essentials plan | Yes, 5 connected accounts with no credit card required |
 Cronofy | Products scheduling across many people, rooms and calendar providers with strict data residency | $819 per month billed annually on the Emerging plan, for up to 500 synced accounts | Free developer account for testing, paid plans for production |
 SimplyBook.me | Service businesses that need a booking website plus a developer API | 11.90 euros per month billed annually on the Basic plan | Yes, 50 bookings per month for 1 provider |
 Acuity Scheduling | Service businesses already using Squarespace that want API-driven bookings | $16 per month billed annually on the Starter plan | No free plan, 7-day trial with no credit card required |
 Appointlet | Small teams that want a low per-member price and simple booking pages | $9 per member per month billed annually on the Premium plan | Yes, up to 5 members, 25 meetings per month and 1 scheduling page |
 YouCanBookMe | Businesses that want calendar-driven booking pages with deep availability control | $9 per month on the Individual plan, or $8.10 billed annually | Yes, 1 calendar connection and 1 booking page |
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
#1Cal.com
Best for: Teams embedding booking into their own product with a full API4.6/5 on
G2 (153 reviews, checked Oct 2026)
Visit cal.com
Starting price$12 per user per month billed annually on the Teams plan
Free planYes, free for 1 user with unlimited event types and calendars
Cal.com is the most developer-friendly booking product in this guide for teams that want to embed scheduling without building a calendar engine from scratch. The API v2 covers event types, availability, bookings and webhooks, and the embed components let you drop booking into your own pages with little front-end work. Routing forms and round robin handle team assignment, and the free plan gives one user unlimited event types and calendars, which is enough to prototype a real integration. Teams pay $12 per user per month billed annually, or $16 month to month. The main caveat is the licence change: the commercial product is closed source since April 2026, and the EU hosted region Cal.eu closed on 1 November 2026.
What we like- API v2 with webhooks, embeddable booking components, routing forms and round robin, and a free plan that covers real solo use
Watch out for- The commercial hosted product moved to closed source in April 2026, so teams that chose it for open source should check the current licence before building on that assumption
#2Calendly
Best for: Products that need a proven booking link and a stable scheduling API4.7/5 on
G2 (2,674 reviews, checked Oct 2026)
Visit calendly.com
Starting price$10 per seat per month billed annually on the Standard plan
Free planYes, 1 event type and 1 calendar connection
Calendly is the default booking link for a reason, and its API is solid for products that need to read event types and availability and create bookings from their own code. Webhooks arrive on paid plans and cover booking creation, cancellation and rescheduling, which is enough to keep your product in sync. Standard costs $10 per seat per month billed annually, or $12 month to month, and Teams costs $16 billed annually with round robin and routing forms. Enterprise starts at $15,000 a year for 50 seats. The free plan is thin for developers, with one event type, one calendar connection and no API access, so budget for Standard from the start.
What we like- A mature REST API with webhooks, wide calendar and video integrations, routing forms and round robin on Teams, and a booking experience most invitees already know
Watch out for- API access is not available on the free plan, so developers must pay for at least Standard before they can call the API in production
#3
Nylas
Best for: Products that need calendar, email and scheduling through one unified API
Visit nylas.com
Starting price$15 per month on the Essentials plan
Free planYes, 5 connected accounts with no credit card required
Nylas is infrastructure rather than a booking page, and that is its strength for developers. Instead of integrating each calendar provider separately, your product connects once to Nylas and reaches Google, Outlook, Exchange and iCloud calendars through one API, plus email and contacts. The Scheduler adds web and React components and a Scheduler API so guests can book inside your product without a Nylas account. The free plan covers 5 connected accounts, Essentials starts at $15 per month, and Pro starts at $49 per month, or $43 billed annually, with calendar-only accounts at $1.50 each per month on monthly billing.
What we like- One API for Google, Microsoft, Apple and other providers, Scheduler components for embedded booking, per-account pricing that starts low, and email and contacts on the same integration
Watch out for- Per-account pricing can climb fast once many customers connect calendars, with calendar-only accounts at $1.50 each per month on Pro, so volume modelling is essential
#4
Cronofy
Best for: Products scheduling across many people, rooms and calendar providers with strict data residency
Visit cronofy.com
Starting price$819 per month billed annually on the Emerging plan, for up to 500 synced accounts
Free planFree developer account for testing, paid plans for production
Cronofy is a specialist API for calendar access and scheduling, and it shows in the design. It connects to Apple, Google, Microsoft Exchange, Microsoft 365 and Outlook.com calendars through one API, with availability, booking, Smart Invites and Application Calendars. OAuth scopes are narrow, so you can request free and busy access without full write access, and the UI Elements give you embeddable availability rules and date pickers. Emerging costs $819 a month billed annually for up to 500 synced accounts, and Growth costs $2,399 a month for up to 3,000 synced accounts, with overage fees beyond those limits.
What we like- A focused calendar and scheduling API since 2014, narrow OAuth scopes, UI Elements for embedded availability and date picking, regional hosting in the US, UK, Germany, Australia, Canada and Singapore, and a 99.99 percent uptime guarantee on paid plans
Watch out for- Production pricing starts at $819 a month billed annually, so there is no low-cost production tier for small products or early-stage teams
#5SimplyBook.me
Best for: Service businesses that need a booking website plus a developer API4.4/5 on
G2 (113 reviews, checked Oct 2026)
Visit simplybook.me
Starting price11.90 euros per month billed annually on the Basic plan
Free planYes, 50 bookings per month for 1 provider
SimplyBook.me is a booking platform for salons, clinics, fitness studios and other service businesses, and it offers a developer API for connecting the booking system to your own website or app. Prices are listed in euros: Free covers 50 bookings a month for one provider, Basic costs 11.90 euros per month billed annually, or 13.90 month to month, for 100 bookings and five providers, Standard costs 24.90 euros billed annually for 500 bookings and 15 providers, and Premium costs 49.90 euros billed annually for 2,000 bookings and 30 providers. Enterprise is priced on request. The API is enabled through an API custom feature that provides API keys, and Enterprise separately advertises high-load API access, so the exact entitlement depends on your plan and account.
What we like- A ready booking website and widget, more than 40 payment gateways, an API custom feature with API keys, and pricing by booking volume that suits seasonal demand
Watch out for- API access is tied to a custom feature and Enterprise lists a separate high-load API, so confirm your account entitlement and endpoint limits before building on it
#6
Acuity Scheduling
Best for: Service businesses already using Squarespace that want API-driven bookings
Visit acuityscheduling.com
Starting price$16 per month billed annually on the Starter plan
Free planNo free plan, 7-day trial with no credit card required
Acuity Scheduling is Squarespace appointment booking product, and its API covers the full booking cycle, including availability checks, client management, blocked time and webhooks. Authentication uses HTTP Basic with a user ID and API key, or OAuth2 with a single api-v1 scope. The price structure is flat per account rather than per seat: Starter costs $16 a month billed annually, or $20 month to month, Standard costs $27 billed annually, or $34 month to month, and Premium costs $55 billed annually, or $69 month to month, with API access, custom CSS, branding removal and a HIPAA option. Note that older third-party reports listed Premium at $49 a month billed annually, while a check dated 25 October 2026 shows $55, so confirm the current figure on the vendor pricing page before you budget.
What we like- A full REST API at api version 1 with availability, booking, reschedule and cancel endpoints, signed webhooks retried for 24 hours, and deep Squarespace integration
Watch out for- API access is sold only on the Premium plan, so developers must pay the top tier before they can call the API, and the single OAuth scope grants the whole account
#7
Appointlet
Best for: Small teams that want a low per-member price and simple booking pages
Visit appointlet.com
Starting price$9 per member per month billed annually on the Premium plan
Free planYes, up to 5 members, 25 meetings per month and 1 scheduling page
Appointlet has scheduled meetings since 2012 and keeps its pricing simple, with one paid tier. The free plan covers up to five members, 25 meetings a month and one scheduling page, which is unusually generous for a team. Premium costs $9 per member per month billed annually, or $12 month to month, and adds automated reminders, payment collection, Zapier, webhooks, branding removal, collaborative hosting and round robin. Enterprise is priced on request with priority support and quarterly account reviews. For developers, the honest limit is the API surface: Appointlet exposes webhooks and Zapier automation on Premium, not a full public REST API with availability endpoints like Cal.com or Nylas.
What we like- A genuinely useful free plan for small teams, round robin and webhooks on Premium, payments through Stripe or PayPal, and a 14-day Premium trial that drops to free with no card required
Watch out for- The developer surface is webhooks and Zapier rather than a full public REST API, so products that need direct API calls for availability and booking should verify the current developer docs before choosing it
#8YouCanBookMe
Best for: Businesses that want calendar-driven booking pages with deep availability control4.7/5 on
G2 (1,922 reviews, checked Oct 2026)
Visit youcanbook.me
Starting price$9 per month on the Individual plan, or $8.10 billed annually
Free planYes, 1 calendar connection and 1 booking page
YouCanBookMe turns calendars into booking pages with strong control over availability, booking forms and workflows. Individual costs $9 a month, or $8.10 billed annually, for two calendars and two booking pages. Professional costs $13 a month, or $11.70 billed annually, for six calendars, ten booking pages, follow-ups, promo codes, HubSpot integration and analytics. Teams costs $18 per member a month, or $16.20 billed annually, and adds round robin, team administration and API access. A two-year commitment cuts those rates by 20 percent. The free plan covers one calendar and one booking page with YouCanBookMe branding.
What we like- Booking pages tied closely to calendar connections, automated workflows and follow-ups on Professional, HubSpot integration, meeting polls for group scheduling, and Stripe payments on every plan
Watch out for- API access is available only on the Teams plan, and the vendor adds a 1 percent commission on every payment collected through a booking page
Frequently asked questions
Which scheduling API is best for developers building booking into their own product
Cal.com is the best starting point for most developers, because its API v2, webhooks and embed components cover the full booking flow at $12 per user per month billed annually, with a free plan for one user. Nylas is the better choice when your product must manage calendars and email across many providers through one integration.
How much does a scheduling API cost per month
Entry prices in this guide range from free plans to $819 a month for Cronofy production access. Cal.com starts at $12 per user per month billed annually, Calendly at $10 per seat, Nylas at $15 a month, and Appointlet at $9 per member. The real cost depends on your model, because per-seat, per-account and per-booking pricing scale differently.
Do these scheduling tools offer webhooks
Yes, most tools in this guide offer webhooks, but the plan that unlocks them varies. Cal.com, Calendly, Nylas, Cronofy and Acuity Scheduling all document webhooks for booking creation, cancellation and rescheduling. Calendly keeps webhooks on paid plans, Appointlet puts webhooks on Premium, and YouCanBookMe puts webhooks on Professional.
Can I embed scheduling in my app without sending users to another site
Yes, Cal.com, Nylas and Cronofy all offer embeddable components or JavaScript elements that run booking inside your own product. Calendly, SimplyBook.me, Appointlet and YouCanBookMe offer embeds and widgets for booking pages. Embedding is the fastest route to a working flow, while building your own interface on the API gives full control over branding and data.
Which scheduling API is cheapest for a small team
Appointlet is the cheapest paid option, at $9 per member per month billed annually, and its free plan covers up to five members and 25 meetings a month. Cal.com is strong value, with a free plan for one user and Teams at $12 per user per month billed annually. Calendly Standard at $10 per seat is close. The cheapest choice depends on whether you need API access, because Calendly and YouCanBookMe gate their APIs behind paid plans.
Sources we checked (10)
- https://cal.com
- https://calendly.com/pricing
- https://developer.calendly.com/api-docs
- https://www.nylas.com
- https://www.cronofy.com
- https://docs.cronofy.com/developers/
- https://simplybook.me
- https://acuityscheduling.com
- https://www.appointlet.com
- https://youcanbook.me
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.