Cal.com is a powerful open-source scheduling tool. Caltsu is a privacy-first calendar sync service. They solve different problems, but often get compared. Here's a clear breakdown.
Caltsu is built for syncing, not storing. We never access your event details, only their busy/free status. Your private information stays private.
For European businesses or anyone concerned with data residency, Caltsu is the simple choice. All data processing happens in the EU.
Caltsu does one thing perfectly: it keeps your calendars in sync in real-time. No extra features to complicate things. Just a reliable, fast sync engine that merges your availability across all your accounts.
Cal.com is the market leader for scheduling links. It offers workflows, team scheduling, and countless customizations for booking meetings.
As an open-source tool, Cal.com gives you total control. You can inspect the code, contribute, or self-host it on your own infrastructure for maximum data ownership.