Built for calendar chaos
We experienced the frustration of managing multiple calendars firsthand. So we built the solution we wished existed.
The Problem We Solved
Like many professionals, we juggled multiple calendars: work Gmail, personal Apple Calendar, shared team calendars. The constant manual copying was exhausting. Existing solutions were either too complex, privacy-invasive, or unreliable.
We wanted something simple: keep our calendars in sync without revealing sensitive information. No booking widgets, no scheduling tools, no unnecessary features. Just perfect synchronization.
Caltsu is the calendar sync tool we built for ourselves, and now we're sharing it with anyone who faces the same challenge.
What Drives Us
By the Numbers
Our Commitment to You
We will never compromise on privacy, reliability, or simplicity. Caltsu will always focus on doing one thing extraordinarily well: keeping your calendars perfectly in sync.
Built by Calendar Users, for Calendar Users
We use Caltsu every day to manage our own calendar chaos. When we improve the product, we're solving our own problems first. That keeps us focused on what actually matters.