Birthday Adapter
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.
github.com/SufficientlySecure/birthday-calendar (opens in a new tab)
About Birthday Adapter
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.
Privacy and F-Droid
F-Droid builds Birthday Adapter from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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What is Birthday Adapter?
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.
Is Birthday Adapter free and open source?
Yes. Birthday Adapter's source code is public on GitHub under the GPL-3.0-only license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Birthday Adapter?
You can install Birthday Adapter from F-Droid (package org.birthdayadapter) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: v3.13).
Is Birthday Adapter still maintained?
The repository's most recent commit was on Aug 23, 2026. Its F-Droid listing was last updated on Aug 26, 2026. appsgit only lists apps whose repository had a commit in the last six months.