Unified Calendar API
One Unified Calendar API to integrate with Outlook, Google, and all your customers’ favorite Calendar tools.
What is a Unified Calendar API?
Calendar platforms each store data differently, with their own authentication and schemas. A Unified Calendar API standardizes these into one interface — operations like Create Calendar, Update Event, Update Calendar work the same way no matter which platform is on the other end, while Knit manages translation, rate limiting, retries, and sync management underneath.
Calendar API Operations
Every operation below is real and already live — not a roadmap item. Browse the full API reference →
Create a new calendar under a user's account
Update an existing event's time, participants, or metadata
Modify name, timezone, or description of an existing calendar
Submit attendee response to an event invite
Move an event from one calendar to another
Retrieve all occurrences of a recurring event
Fetch all events for a calendar within a date range
Retrieve all calendars owned or shared with a user
Fetch full details of a specific calendar event
Fetch metadata of a specific calendar by ID
Retrieve free or busy time blocks for one or more calendars
Find common available time across multiple users
Create a new event with attendees and conferencing details
Our AI Agent builds it instantly.
Try Now4 Calendar apps you can integrate with today
Google Calendar
Google Calendar integrates via Knit's Unified Calendar API — live in days, not weeks.
iCalendar
Power iCalendar API integration via Knit's Unified Calendar API — no per-platform maintenance.
Outlook Calendar
Outlook Calendar integrates via Knit's Unified Calendar API — one schema, one integration.
Zoho Calendar
Enable Zoho Calendar API integration via Knit's Unified Calendar API — live in days, not weeks.
Don't see your app here?
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Why Knit for Calendar integrations
Extensive webhook support
Real-time sync without constant polling — get notified the moment Calendar data changes.
Scalable infra
Sync thousands of Calendar records in minutes, not hours.
Add a missing app in days
AI-powered connector building means a missing Calendar platform isn't a months-long wait.
Unified Calendar API vs. building it yourself
Building it yourself
- A separate integration for every Calendar platform you support
- Different schema, auth, and pagination per platform
- You build and maintain OAuth for each platform
- Poll each API on your own schedule
- Engineering effort grows with every new platform
- Weeks to months per platform, per engineer
With Knit
- One Unified Calendar API covers every platform you support
- One normalized schema across every platform
- Embedded Auth handles OAuth, storage, and refresh for you
- Extensive webhook support for real-time sync
- Describe a missing app to the Integrations Agent and get it built instantly
- Live in days, not months
Customer Stories
See how leading technology firms are scaling their operations
Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude.
A brilliant tool to let you seamlessly integrate with many different systems. It is very easy to integrate with and customer support is next level.
Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support.
Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development.
Knit shipped a brand-new Timesheet API in a week and handed us a ready-to-use NetSuite sandbox. That velocity is priceless when you're running payroll in 40+ countries.
#1 in Ease of Integrations
4.9 out of 5 stars on G2
Common questions about the Unified Calendar API
Which Calendar systems does Knit support?
4 Calendar platforms today — including Google Calendar, iCalendar, Outlook Calendar and more. Missing one you need? Knit's AI-assisted connector-build process typically adds a new one within days.
Does the Unified Calendar API support both reading and writing data?
Yes. It supports both reads and writes, so you can build bi-directional sync use cases — not just pull Calendar data, but push updates back to the source app.
How does authentication work across Calendar platforms?
Knit provides an embedded Auth component (white-labeling available on higher tiers) that handles OAuth, credential storage, and refresh — your customers authorize once through Knit, and you never touch raw credentials.
What is the timeline for adding a missing Calendar connector?
Typically days, not months — the same AI-based connector-build tooling that lets us maintain the 4 Calendar connectors already live.
Do you store Calendar data or customer PII?
No. Knit acts as a stateless passthrough — data is processed on our application server and sent directly to your webhooks, without being stored on Knit's servers.
What is the pricing model, and is there a free trial?
You choose the model that fits your business — pricing based on integrated accounts, or based on API call volume. Every plan includes a 30-day free trial before billing starts.