There is no OpenCalendar server. Nothing leaves your phone unless you ask.
Everything is stored on the device, in a database encrypted with AES-256. The key lives in Android secure storage and never leaves it.
Android cloud backup is turned off: your appointments never end up in Google Drive. Need a backup? The app creates a file encrypted with a passphrase you choose.
No sign-up, no analytics, no crash reporting, no advertising and no third-party SDK that sends data.
A map, an import. Every connection is written to a log you can read whenever you want.
One tap turns every title into "Busy". The app hides itself in the recent-apps switcher and blocks screenshots.
Anything you mark as protected stays hidden until you unlock it, and never shows up in the widgets.
Month, week, day and agenda, with per-calendar colours and priorities you can tell apart by shape, not just colour.
Export your calendar from Google and pick the .zip in the app. It is read on your phone, offline, and you can import again without duplicates.
Up to five reminders per event: at the start, 15 or 30 minutes before, the day before, a week before…
Agenda, month and week on your home screen. Move between months or weeks without opening the app.
Menstrual cycle log with prediction, in a protected calendar. Do not need it? Turn it off and it disappears from the whole app.
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