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New: Connect Claude & ChatGPT to your calendars – the AI assistant is here

Kalender Sync

ChatGPT

Connect ChatGPT to all of your calendars

Kalender Sync connects ChatGPT to all of your calendars: Outlook, Google, Apple, GMX, WEB.DE and more. With one connector you can let your agent handle your calendars from now on. Create events, check availability, plan your day, all through a single interface.

Connect ChatGPT now No credit card required.

Reaches these calendars

GoogleOutlookApple iCloudGMXWEB.DEmailbox.orgKSuitePosteo

How it works

Connect ChatGPT
in 3 simple steps

01

Turn on developer mode

Open the settings in ChatGPT and switch on developer mode at the bottom of the plugins section. Right now that is the only way ChatGPT lets in third-party connections.

02

Add Kalender Sync

Create a new plugin, give it a name and enter our server address. Pick OAuth as the sign-in method and the browser login takes care of the rest.

https://app.kalender-sync.de/mcp
03

Grant your calendars

ChatGPT sends you over to us. There you choose which calendars are visible and how much of them, and from then on ChatGPT answers from your real calendar. That puts you in with more than 1,000 people who no longer hunt for free slots themselves.

Features

What you get when ChatGPT knows your calendar

Every calendar on one connection

ChatGPT can connect to one account; we hand it your entire schedule. Outlook, Google, Apple, GMX, WEB.DE, mailbox.org, kSuite and Posteo come together in Kalender Sync. OpenAI never sees your credentials for those accounts: they stay with us, and you can withdraw access in one place.

From chat to assistant

Without your calendar ChatGPT answers in general terms. With it, it suggests times that are genuinely free, writes the email to your client and books the event when you want it to.

Plan my Thursday. Offer Lisa three free times. Put the call on Tuesday at 10.

You decide what ChatGPT sees

For each calendar you choose between busy, title with time, and full details. What you don't grant doesn't exist for ChatGPT, and attendees or attachments never leave your calendar.

And you decide what it may do

Whether it only looks or also creates events is your call, per calendar. Every action is logged with a timestamp so nothing happens unnoticed, and you can end the connection with one click. Hosted in Germany.

Tutorial

This is how you connect ChatGPT.

The video walks the whole way: turn on developer mode, add Kalender Sync and grant your calendars at the level of detail you want.

Read the guide
Connect Your AI Assistant to Your Calendar – Claude, Claude Code & ChatGPT | Kalender Sync

Clicking play loads YouTube. Data will be sent to Google.

Examples

What you can ask ChatGPT

It stays an ordinary conversation. The difference is that ChatGPT can now look into the calendars you granted instead of guessing.

See the day

You ask once and get a summary across every account. No more switching between Outlook, Google and the private calendar.

  • What is still on today?
  • What does my week look like?
  • Anything important on Friday?

Find free time

Asking for a free window saves the most time. ChatGPT checks every connected calendar at once and only suggests times that are genuinely free.

  • Where do I have two hours in one piece this week?
  • When does a meeting with Lisa fit?
  • Offer three times for a first call.

Create events

If you allow creating for a calendar, ChatGPT doesn't just write the suggestion, it books the event in the right calendar as well.

  • Put the call on Tuesday at 10.
  • Block 7 to 8 in the morning for the gym.
  • Add the dentist on the 3rd at 9.

Wall of Love

Don't just take our word for it.

Our users are our best and most honest ambassadors. See why they wouldn't go back.

Felix Hehn
Felix Hehn Founder, multi-company operator
„With three companies I used to dig through three calendars whenever somebody asked for a meeting. Today I ask once and get an answer that already accounts for all of them."
Louis Hügle
Louis Hügle Self-employed electrician
„I am on job sites all day and rarely near a computer. When a customer calls, I just say the appointment into my phone afterwards and it lands in the right calendar with the address."
Julius Richter
Julius Richter Software developer (employed + freelance)
„I am in the terminal anyway, so that is where I plan now. One sentence and the four hours for the rebuild are in my calendar without me switching windows."
Leonid Schmidt
Leonid Schmidt Marketing manager
„I started by only letting it look things up, because I was sceptical. These days it prepares half my week and I mostly just correct things."
Oliver Hasenzahl
Oliver Hasenzahl Lecturer & manager
„I am honestly not a tech person and did not want anything complicated. I type in when I would like to hold office hours and get three suggestions that actually work."
Luis Otterbeck
Luis Otterbeck Self-employed & agency
„Sending clients meeting options was always the task that got left for later. Now the email comes back written and already checked against the agency and project calendars."

FAQ

Frequently asked questions about ChatGPT

What is ChatGPT allowed to do in my calendar?

Only what you allow, and separately per calendar. The switch for creating events starts off, and plenty of people let ChatGPT look first.

Every query and every event is logged with a timestamp in the app. If something looks odd, you end the connection there with one click.

What the assistant may do

Connect your other agents too

Kalender Sync sits behind an open interface, so whatever else you use reaches the same calendars in the same way. Every agent gets its own access with its own visibility, and you can end each one separately.

Ready for a ChatGPT that knows your schedule?

Connect ChatGPT now

Currently supported providers

GoogleMicrosoftApple iCloudKKSuiteGMXWEB.DEmailbox.orgiCal-Feeds