# Birthday Adapter (open-source calendar and contacts app)

> Birthday Adapter is a free, open-source calendar and contacts app for Android. See birthdays and other events from your contacts in your calendar. It has 158 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid and Google Play.

Birthday Adapter brings birthdays, anniversaries, and other events from your contacts to your Android calendars. Unlike other apps, it creates a dedicated calendar within your system, so you can view all your contact dates alongside your daily schedule in your favorite calendar app. FEATURES * Address Book Based: Store birthdays directly in your contacts - no manual lists to maintain or duplicate entries to manage. * Filtering: Choose which accounts or contact groups you want to see in your calendar.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/SufficientlySecure/birthday-calendar |
| Platforms | Android |
| Built with | Java |
| GitHub stars | 158 |
| License | GPL-3.0-only (open source) |
| F-Droid | https://f-droid.org/packages/org.birthdayadapter/ (package org.birthdayadapter) |
| F-Droid anti-features | none flagged |
| Google Play | https://play.google.com/store/apps/details?id=fr.heinisch.birthdayadapter |
| App Store | not linked |
| Website | none listed |
| Official | no |
| Category | Calendar & contacts |
| Latest release | v3.13 (Jun 10, 2026) |
| Last commit | Aug 23, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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Canonical page: https://appsgit.com/mobile-apps/birthday-adapter
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