Etar review: a calendar that stays on the phone
Etar is a free open-source Android calendar that can keep a schedule on the phone. See how sync works, what it stores, and how to install it.
Etar is a free open-source Android calendar that can keep a schedule on the phone. See how sync works, what it stores, and how to install it.
DAVx⁵ is open-source calendar sync for Android. Learn where contacts and events live, what the app costs, and how to set up the first account.
Tuta’s calendar comes encrypted the same way as its mail: appointment titles, locations and details are unreadable to the server, and the free tier includes it. German jurisdiction, open-source apps, no ads anywhere. Sharing calendars with outside users is limited by the encryption model, and it works best inside the Tuta ecosystem. The most private […]
EteSync syncs calendars, contacts and tasks between your devices through end-to-end encryption, open source with published security audits, and a self-host option for people who want the server too. It is infrastructure rather than an app: you keep using your calendar program, EteSync just moves the data safely. Some calendar apps integrate more smoothly than […]
Radicale is a tiny open-source CalDAV and CardDAV server: a single Python process serving your calendars and contacts to all your devices from your own machine or server. No interface, no company, no data leaving your control. Setup is command-line territory, and every device needs manual configuration. The purist’s choice, and famously light on resources.
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