Nylas Calendar API
One Calendar API. Every Provider.
Build custom scheduling in your app 10x faster.
- Full CRUD on calendar events across all major providers with a few lines of code — no provider-specific edge cases to handle.
- Webhook-first sync with <142ms P95 delivery latency and automatic exponential-backoff retries built in.
- 99.99% uptime, hands-free maintenance — stop babysitting OAuth token refreshes and polling loops.
Talk with an expert to see the Nylas Calendar API in action.
For more information about how this data is used, please view our Privacy PolicyShip Calendar Integration in Hours, Not Weeks
Building native calendar integration takes 5,000+ developer hours. Nylas abstracts the fragmented provider APIs — Google, Outlook, Exchange, iCloud — into one predictable, high-performance scheduling API.
Bi-Directional Sync Engine
Delta cursors track only what changed since your last checkpoint. Your database stays in sync with the provider truth without full-polling overhead or race conditions.
Real-Time Webhook Delivery
event.created, event.updated, event.deleted — structured payloads with HMAC-SHA256 signature verification on every delivery, with polling fallback for providers that don’t support push.
Smart Availability & Booking API
Round-robin, buffer time, collective availability across up to 50 participants. The entire scheduling API logic ships as a single POST /v3/calendars/availability call.
Deliver custom, front-end scheduling experiences with the Nylas Scheduler
Pre-built booking interface, event modal, and conflict resolution components. Deploy a full scheduling API experience without writing a single line of availability logic
Explore the Nylas Scheduler:
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Modular design: Combine and interchange web components to use only what you need.
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End-to-end customization: Tailor pre- and post- booking workflows to your users and their use cases.
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Native experience: Deliver a front-end experience that reflects your app’s design.
Compliance
We’ve engaged respected third-party firms to audit our infrastructure and security practices,
resulting in multiple compliance certifications and attestations.
Privacy
We are committed to ensuring the privacy of your data and preventing unauthorized access to it. Our Privacy Policy details what data is collected, how we use it, and how it is stored.
Did you know that Nylas also has:
Industry-leading email functionality
With a few lines of code, build email CRUD capabilities and bi-directional sync. Connect with 100% of email service providers with a single connector and near-perfect deliverability.
Powerful meeting recording out of the box
Record, transcribe, and analyze calls in real time. Nylas delivers clean, normalized meeting data ready for summaries, insights, and downstream automation.
Transactional email via verified domains
Designed for emails that doesn’t depend on a user’s mailbox, making it a better fit for product notifications, invitations, confirmations, and other outbound emails that need to scale.
Optimizing scheduling chaos for leading companies across the globe
Talentreef accelerates time-to-hire with the Nylas Calendar API
“There’s no longer any disconnect with users copying and pasting information for scheduling or sending out manual emails. This has made a huge difference in response times.”
Alexander Plumb,
Sr. Product Manager @ TalentReef
3 days
reduced in time-to-hire
2x
faster to build calendar features, with 1/2 the resources
CatchApp increases sales conversion and increases user base
“For us, the main pain point that Nylas addressed was providing [calendar integration] in a consistent manner across multiple platforms and providers.”
Oliver Lamming,
CTO of CatchApp
66%
growth in user base within three months
400%
increase in sales conversion
Trusted by over 250,000 developers worldwide
