Unified Calendar API

One Unified Calendar API to integrate with Outlook, Google, and all your customers’ favorite Calendar tools.

Sign UpBook Demo
Sign UpBook Demo

Powering Global SaaS Organizations

What is a 

Unified Calendar API

Every calendar platform - Google Calendar and Microsoft Outlook - stores events, attendees, and availability data differently, with its own authentication methods, schemas, and APIs. Building separate integrations for each takes months of engineering work and ongoing maintenance as APIs evolve.

A Unified Calendar API standardizes these differences into a single interface. Integrate with Knit once to access multiple calendar platforms through one unified data model.

Your team works with a single API while Knit handles translation, rate limiting, retries, and sync management behind the scenes.

1curl --request GET \
2	--url https://api.getknit.dev/v1.0/calendar.calendars.list \
3	--header 'accept: application/json'

200 OK

View Supported Apps

Why Choose KNIT for Calendar Integrations?

Extensive webhook support

Build real-time Calendar integrations with our comprehensive Calendar events coverage across all major Calendar APIs.

Scalable Infra

Sync thousands of Calendar events in minutes with Knit’s Unified Calendar API—backed by infrastructure and platform features built for scale.

Add any missing app in 2 days

Popular Calendar apps come pre-integrated. Need another? Our AI adds new ones fast, so you’re always ready to say yes to your customers.

Unified Calendar APIs

The most common Calendar APIs come ready to use with our unified schema. For edge cases, Knit's AI Connector Builder and passthrough APIs offer all the flexibility you need.

  • POST

Update Event

Update an existing event's time, participants, or metadata

  • POST

Update Calendar

Modify name, timezone, or description of an existing calendar

  • POST

Send RSVP

Submit attendee response to an event invite

  • POST

Move Event

Move an event from one calendar to another

  • GET

List Event Instances

Retrieve all occurrences of a recurring event

  • GET

List All Events

Fetch all events for a calendar within a date range

  • GET

List All Calendars

Retrieve all calendars owned or shared with a user

  • GET

Get Single Event

Fetch full details of a specific calendar event

  • GET

Get Single Calendar

Fetch metadata of a specific calendar by ID

  • GET

Get Free/Busy Slots

Retrieve free or busy time blocks for one or more calendars

  • GET

Get Availability

Find common available time across multiple users

  • POST

Create Event

Create a new event with attendees and conferencing details

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Whitelabeled Calendar Auth—Fully Yours

Give your users a seamless, on-brand authentication experience for their Calendar integrations. Customize everything—from text and colors to screen flow—to match your product perfectly.

Try it Now

No items found.

Calendar API integrations Knit supports

Integrate with every major Calendar tool from day one. If it’s missing, our AI adds it fast. You focus on your product—we’ll handle the integrations.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Google Calendar

Unified Calendar API

iCalendar

Unified Calendar API

Outlook Calendar

Unified Calendar API

Zoho Calendar

Unified Calendar API
Check Circle
Request Successfully Placed

We’ll let you know as soon as this app is available

Oops! Something went wrong while submitting the form.
Close Icon

Customer Stories

See how leading technology firms are scaling their operations and driving measurable growth using Knit

“Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude.”

Huynh H

Developer

Multiplier

“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.”

Jayesh

Co-Founder

“Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support.”

Poorvi

Product Manager

“Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development.”

Aditya

Product Lead

“Adding integrations has never been easier. Knit has been a game-changer for our team, enabling effortless custom workflows across Slack, HubSpot, Xero, and more.”

Shreelekha S

Content

Customer Stories

See how leading technology firms are scaling their operations and driving measurable growth using Knit

“Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude.”

Huynh H

Developer

Multiplier

“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.”

Jayesh

Co-Founder

“Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support.”

Poorvi

Product Manager

“Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development.”

Aditya

Product Lead

“Adding integrations has never been easier. Knit has been a game-changer for our team, enabling effortless custom workflows across Slack, HubSpot, Xero, and more.”

Shreelekha S

Content

Customer Stories

See how leading technology firms are scaling their operations and driving measurable growth using Knit

“Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude.”

Huynh H

Developer

Multiplier

“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.”

Jayesh

Co-Founder

“Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support.”

Poorvi

Product Manager

“Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development.”

Aditya

Product Lead

“Adding integrations has never been easier. Knit has been a game-changer for our team, enabling effortless custom workflows across Slack, HubSpot, Xero, and more.”

Shreelekha S

Content

#1 in Ease of Integrations

g2-logo

4.9 out of 5 stars on G2

g2-logo

4.9 out of 5 stars on G2

Put Integrations on Autopilot. Talk to Experts.

Knit is loved by customers across the globe due to our seamless product and white glove support. You'll love us too!

Book A Demo

FAQ’s

All the common questions around Knit’s Unified HRIS API

No items found.

Ready to Transform Your Calendar Integrations?

Book A Demo