Sync your calendars & connect them to ChatGPT, Claude & Co.
Keep Google, Outlook, iCloud and supported CalDAV calendars in sync, one-way or two-way. Choose what gets copied: busy only, title and time, or full details. Connect the same calendars to ChatGPT and Claude to check availability, find events and create new ones. Built for people juggling work, personal and client calendars, including GMX, WEB.DE, mailbox.org and kSuite. Set it up in minutes or by simply asking your agent.
Hey Product Hunt! I'm Paul, and together with Julius I build Kalender Sync.
We work across several ventures at once. That means work, personal and client calendars, spread across different providers. People kept booking over private appointments because one calendar showed us as free. And keeping everything up to date by hand got old fast. 🙃
We couldn't find a tool that handled this the way we wanted. So we built one. What Kalender Sync does:
Keeps your calendars in sync, one-way or two-way. Google, Outlook, iCloud and supported CalDAV calendars.
You decide what gets copied. Busy only, title and time, or full details. Your dentist appointment can block your work calendar without anyone seeing what it is.
Supports the providers others skip. GMX, WEB.DE, mailbox.org and kSuite work too, not just the big three.
Connects to ChatGPT, Claude and many more. Link the same calendars to your assistant to check availability, find events, create new ones and manage your syncs across all of them.
Ready in minutes. Set it up yourself, or simply ask your agent to do it for you.
We'd love your feedback. Which calendars are you juggling right now, and where does your current setup fall short? Julius and I are here all day to answer questions!
🎁 Launch offer: Code PH50 gives you 50% off the first annual bill of a new Basic or Professional subscription.
About Kalender Sync on Product Hunt
“Sync your calendars & connect them to ChatGPT, Claude & Co.”
Kalender Sync launched on Product Hunt on October 22nd, 2026 and earned 64 upvotes and 9 comments, placing #25 on the daily leaderboard. Keep Google, Outlook, iCloud and supported CalDAV calendars in sync, one-way or two-way. Choose what gets copied: busy only, title and time, or full details. Connect the same calendars to ChatGPT and Claude to check availability, find events and create new ones. Built for people juggling work, personal and client calendars, including GMX, WEB.DE, mailbox.org and kSuite. Set it up in minutes or by simply asking your agent.
On the analytics side, Kalender Sync competes within Productivity, Calendar and Artificial Intelligence — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how Kalender Sync performed against the three products that launched closest to it on the same day.
Who hunted Kalender Sync?
Kalender Sync was hunted by Paul Koch. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Kalender Sync including community comment highlights and product details, visit the product overview.
Paul Koch
Hey Product Hunt! I'm Paul, and together with Julius I build Kalender Sync.
We work across several ventures at once. That means work, personal and client calendars, spread across different providers. People kept booking over private appointments because one calendar showed us as free. And keeping everything up to date by hand got old fast. 🙃
We couldn't find a tool that handled this the way we wanted. So we built one. What Kalender Sync does:
Keeps your calendars in sync, one-way or two-way. Google, Outlook, iCloud and supported CalDAV calendars.
You decide what gets copied. Busy only, title and time, or full details. Your dentist appointment can block your work calendar without anyone seeing what it is.
Supports the providers others skip. GMX, WEB.DE, mailbox.org and kSuite work too, not just the big three.
Connects to ChatGPT, Claude and many more. Link the same calendars to your assistant to check availability, find events, create new ones and manage your syncs across all of them.
Ready in minutes. Set it up yourself, or simply ask your agent to do it for you.
Try it for free at kalender-sync.de, or connect it directly to Claude or ChatGPT.
Shipped with love from Munich 🥨💙
We'd love your feedback. Which calendars are you juggling right now, and where does your current setup fall short? Julius and I are here all day to answer questions!
🎁 Launch offer: Code PH50 gives you 50% off the first annual bill of a new Basic or Professional subscription.