# Thunderbird Beta for Testers (open-source email app)

> Thunderbird Beta for Testers is a free, open-source email app for Android. Thunderbird is a 100% open source, privacy focused email app. It has 14,192 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.

Help make the next Thunderbird release as awesome as possible by downloading Thunderbird Beta and getting early access to the latest features and bug fixes before they're officially released. Your testing and feedback are important, so please report bugs, rough edges, and share your thoughts with us! Find our bug tracker, source code, and wiki at We’re always happy to welcome new developers, designers, documenters, translators, bug triagers and friends. Visit us at to get started. Thunderbird is a powerful, privacy-focused email app. Effortlessly manage multiple email accounts from one app, with a Unified Inbox option for maximum productivity.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/thunderbird/thunderbird-android |
| Platforms | Android |
| Built with | Kotlin |
| GitHub stars | 14,192 |
| License | Apache-2.0 (open source) |
| F-Droid | https://f-droid.org/packages/net.thunderbird.android.beta/ (package net.thunderbird.android.beta) |
| F-Droid anti-features | none flagged |
| Google Play | https://play.google.com/store/apps/details?id=net.thunderbird.android.beta |
| App Store | not linked |
| Website | https://thunderbird.net |
| Official | yes (published by the organization behind the product) |
| Category | Email clients |
| Latest release | K9MAIL_24_0 (Oct 5, 2026) |
| Last commit | Nov 6, 2026 |

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

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