# Thunderbird for Android

> Open-source email app for Android

Formerly K-9 Mail.

- Source: https://github.com/thunderbird/thunderbird-android
- Homepage: https://thunderbird.net/mobile
- License: Apache-2.0
- Language: Kotlin
- Stars: 14056
- Forks: 2829
- Contributors: 541
- Last commit: 2026-10-02
- Latest release: K9MAIL_23_1 (2026-09-22)
- Purpose: Communication
- Runs on: Mobile
- For: Personal

## Worth score: 80/100

How much DigGitHub recommends it, from activity, adoption, docs, license and security signals.

- Popularity: 21/25
- Momentum: 10/20
- Maintenance: 25/25
- Community: 13/15
- Readiness: 11/15

## Alternatives

- [ntfy](https://diggithub.com/binwiederhier/ntfy.md): Push notifications to phone or desktop with a simple POST
- [Folo](https://diggithub.com/RSSNext/Folo.md): AI-powered RSS reader
- [SimpleX Chat](https://diggithub.com/simplex-chat/simplex-chat.md): Private messenger without user IDs
- [Rocket.Chat](https://diggithub.com/RocketChat/Rocket.Chat.md): Communications platform with full data control
- [Signal for Android](https://diggithub.com/signalapp/Signal-Android.md): Private messenger for Android
- [bitchat](https://diggithub.com/permissionlesstech/bitchat.md): Bluetooth mesh chat
- [RTranslator](https://diggithub.com/niedev/RTranslator.md): Real-time translation app for Android
- [Mastodon](https://diggithub.com/mastodon/mastodon.md): Self-hosted social network in the fediverse

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Source page: https://diggithub.com/thunderbird/thunderbird-android
Updated: 2026-10-03