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.
I’ve been using Kalender Sync to connect our shared iCloud family calendar with ChatGPT, and it’s made organizing our family life so much easier!
What really stands out is the team behind it. Paul and Julius genuinely listen to feedback and are always happy to help. Great product, great support — congrats on the launch! 🙌
The “busy only” option is the bit that wins me over. A personal appointment should block the time without sharing my life story with colleagues. Congrats on the launch!
Hey everyone, Julius here, the other half of Kalender Sync 👋 And thanks to everyone we've already heard from today!
Paul already told the story, but I want to add my share to it.
We built this for ourselves. We both work across several companies at once, each with its own calendar, and we were tired of double bookings and copying appointments around by hand. That pain is gone for us now, and honestly that alone made it worth it. 🙃
What I'm most excited about, though: you can set up and manage your syncs entirely through your agent. Because let's be honest, who actually enjoys spending time in their calendar settings? Maybe I should go touch some grass instead ;)
Another thing that makes me really happy is that we cover so many calendar providers. A good share of our users aren't on Google or Microsoft or Apple at all. They're on GMX, WEB.DE, mailbox.org, kSuite and others. Those providers will probably wait a long time for native AI features.
The feedback from exactly these users has been incredibly kind, and it's a big reason we're here today. Thank you to everyone who tested early, reported bugs and stuck with us 💙
If your calendar provider is one that usually gets forgotten, I'd love to hear which one. And if you're juggling calendars across several jobs, tell us how you handle it today. Any questions? Fire away!
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 68 upvotes and 13 comments, placing #26 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.
Kalender Sync was featured in Productivity (663.7k followers), Calendar (32.1k followers) and Artificial Intelligence (481.7k followers) on Product Hunt. Together, these topics include over 306.8k products, making this a competitive space to launch in.
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.
Want to see how Kalender Sync stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
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.