You have a dentist visit on Tuesday, a birthday on Friday and a work shift that repeats every second week. Fossify Calendar, from the developer Fossify, is built for that kind of schedule and runs on Android 8.0 or newer. It is free, carries no ads, and its source code is public on GitHub under the GPL-3.0-only licence.
Cluttered calendars and the privacy question
Many calendar apps ask for broad permissions or show ads next to your appointments. Fossify Calendar is aimed at people who want to avoid that. It is ad-free, and the developer says there is no tracking and no intrusive permissions.
The app belongs to the calendar-apps category and is tagged open-source and no-ads. It is free. The code is hosted at github.com/FossifyOrg/Calendar, so anyone can read what the app does.
Repeat rules, sync accounts and five views
Events can carry a time, a duration, reminders and advanced repetition rules. That covers the biweekly shift example above. Reminders can use custom sounds, looping audio streams and vibration, and the app supports themes.
For syncing, the developer names Google Calendar, Outlook, Nextcloud and Exchange, plus others. You can switch between daily, weekly, monthly, yearly and event views, and event filters help narrow the list. Holidays and special dates such as birthdays and anniversaries can be imported. Home screen widgets are included, with colour themes.
The app follows a Material Design layout.
What to check before installing version 1.12.1
The current version is 1.12.1, updated on October 27, 2026. The package ID is org.fossify.calendar, and the download is 7.8 MB. Your device needs Android 8.0 or later, so older phones are ruled out.
Sync with outside services depends on those accounts being set up on your device. If you use a different calendar today, test the import and sync on a spare calendar first.
Alternatives for comparison include Google Calendar and Samsung Calendar. Both are broader platform products, while this app is a small open-source option.
Fossify Calendar pros and cons
Pros
- No ads, and it is free
- Source code is public on GitHub under GPL-3.0-only
- Syncs with Google Calendar, Outlook, Nextcloud and Exchange, per the description
- Daily, weekly, monthly, yearly and event views plus event filters
- Small download at 7.8 MB
Cons
- Requires Android 8.0 or newer
- No Google Play rating or install figures to compare
- Version 1.12.1 is the current release
Is Fossify Calendar safe?
The APK on this page is the unmodified file, kept with its checksum and signature details. Its SHA-256 is dae815ce83285facf9fd8648b8c4f039700d95126325db124521eba479b270ba, so you can compare it with your download before installing. The calendar code is published under GPL-3.0-only, so anyone can inspect it, and the app shows no ads.
How to install Fossify Calendar
- Download the APK with the button on this page and wait for it to finish.
- Compare the file with the SHA-256 checksum shown here if you want to confirm it arrived intact.
- Open the file on your phone and allow installs from this source when Android asks.
- Finish the install, then open Fossify Calendar from your app drawer.
