Email API
Calendar API
Contacts API 
Scheduler
Notetaker API
Google email & calendar integration
Outlook email & calendar integration
IMAP integration
Calendar management
Embedded contextual email
Scheduling automation
Automated outreach
Expense management
Customer relationship management
Applicant tracking system
Communications platform
Marketplaces
Document management
Docs
SDKs
Tutorials
API status
Changelog
Support
Blog
Events
Guides
Inspiration gallery
Partners
Build vs. buy
Customer stories
Security & Compliance
Why Nylas
Newsroom
How to schedule time slots and check availability
Building a scheduling application that displays the organizer’s available timeslots seems like a simple problem at first glance, but it can easily become very hard to manage.
Build apps with real-time calendar availability
Give users the easiest scheduling experience across calendars. The Nylas API syncs schedulers with Google and Outlook, checks group availability, and simplifies coordination across time zones.
Calendar availability API
Ship calendar features faster
Prevent double booking
The Nylas calendar availability API pulls accurate, up-to-date availability from Google Calendar and Outlook Calendar to avoid scheduling conflicts.
Build on trusted calendar data
Create new scheduling apps or improve existing products by adding calendar availability to CRMs, HR tools, or booking platforms with our API.
Become the go-to for group bookings
Build with scheduling logic for finding shared group calendar availability, or round-robins to spread meetings across available users.
Build powerful availability features for your app
Compatible with any business app, from startups to enterprises, Nylas makes scheduling a breeze.
Group scheduling support
Check availability across calendars and participant needs without writing custom logic. Nylas handles scheduling automation so you can build a better app experience for your users.
Google Calendar availability
Sync with Google Calendar availability to check user schedules in real-time, ensuring accurate meeting planning.
Outlook Calendar availability
Integrate with Outlook calendar availability to support enterprise users and streamline scheduling.
Time zone support
Handle scheduling across time zones effortlessly. Events scheduled with the Nylas API inherits the time zones you specify, making it a go-to choice for global businesses and distributed teams.
Real-time availability checks
Pull free/busy status for individuals or groups instantly. Support both one-on-one meetings and group bookings across organizations with real-time visibility into both Google and Outlook calendars.
Trusted by over 250,000 developers worldwide
Developers integrate calendar availability in minutes
With the Nylas availability calendar tool, adding availability features to your app is straightforward:
Authenticating users
Create a Nylas account, get your API key, and securely connect to Google, Outlook, and other calendar providers in one seamless integration.
Sync availability across calendars
Use endpoints like Get Availability and Get Free/Busy to see open time slots, handle recurring events, and work across time zones.
Automating scheduling
Use our API to create, update, or cancel meetings. Add meeting information like participants, location and conferencing links.
Use Cases
What can you build with Nylas?
You build the features your users want. We’ll handle the calendar infrastructure behind it.
CRM platforms
In CRMs, you can add calendar availability to contact and deal views, enabling sales or support reps to schedule follow-ups instantly.
Client bookings
For client bookings, you can avoid conflicts by syncing with connected calendars and build logic to assign available staff.
Event planners
Event planners can check group availability to coordinate large events and create or update event details programmatically.
Meet Nylas
Why developers use Nylas for calendar availability
Works with all providers
Connect to Google, Outlook, and other calendars through one integration.
100%
of email, calendar, and contacts providers connected.
Built for scale
Check availability for individuals or entire teams.
Billions
of financial transactions processed daily.
Saves time
Automate availability checks and avoid building custom scheduling logic.
3 hours
saved daily on operational tasks for users.
Easy to implement
Clear docs and SDKs to get your calendar availability tool up and running fast.
8x faster
to build features than developing from scratch.
100%
of email, calendar, and contacts providers connected.
Billions
of financial transactions processed daily.
3 hours
saved daily on operational tasks for users.
8x faster
to build features than developing from scratch.
Start building with Nylas today
Ready to add a powerful calendar availability API to your business app?
Try Nylas in our developer sandbox, explore our comprehensive documentation, or join our community for support.
Explore related resources
How to manage calendar availability with Nylas
Managing availability for scheduling on multiple calendars—whether for healthcare providers, tutors, interviewing or other professionals—can be complex and resource-intensive.
Calendar for Appointment Scheduling
A calendar scheduler is a widget, application, or web-based tool that allows you to schedule and manage events, appointments, meetings, and other activities using a calendar interface.
Wondering how calendar availability works?
Need more help? Let’s talk!
How does the Nylas Calendar API handle availability across different calendar providers?
Nylas provides a unified API that normalizes data from Google Calendar, Outlook, Exchange, and other providers. This lets you query and display real-time availability across all calendar systems with one integration.
Can I show group or team availability using the API?
Yes. You can fetch free/busy data for multiple users at once using our /availability endpoint to display combined availability for teams, departments, or shared resources.
Is the Calendar Availability feature secure and compliant?
Absolutely. Nylas is SOC 2 Type II, GDPR, and HIPAA compliant. All data is encrypted in transit and at rest, and we follow industry best practices for authentication and authorization.
Can I customize availability rules (e.g., working hours, buffer times)?
Yes. The Nylas API lets you define availability constraints like working hours, meeting lengths, buffer times, and more so you can tailor the experience to your users’ needs.
Do I need to build my own scheduling interface?
Not necessarily. While you can build a custom UI, Nylas also provides ready-to-use scheduling components that integrate with the availability API for a faster go-to-market.