# thunderbird/thunderbird-android

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

Repository: https://github.com/thunderbird/thunderbird-android
Canonical: https://ross.abutalabs.com/products/thunderbird-android
Homepage: https://thunderbird.net/mobile
Language: Kotlin
License: Apache-2.0
License Family: permissive
Topics: android, email, communication, mozilla
Last push: 2026-08-26T15:22:29+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 97, longevity 100
- inputs: {"age_days": 5689, "days_push": 7, "days_rel": 22, "gap_med": 0, "n_releases_24m": 50}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 13923, forks 2790 (observed 2026-08-28T04:11:05.067093+00:00)

## What it is
Thunderbird for Android is a free, open-source, privacy-focused email client for Android, formerly known as K-9 Mail and now part of the Mozilla Thunderbird project. It supports multiple accounts, a unified inbox, and OpenPGP end-to-end email encryption via OpenKeychain.

## Use cases
- manage multiple email accounts on android
- unified inbox for all my email
- open-source email app without ads or tracking
- send encrypted email with openpgp on android
- replace gmail app with a privacy-focused client
- k-9 mail successor app
- read work and personal email in one app

## When to choose
- you want a free, ad-free, open-source email app on Android
- you need to manage multiple accounts with a unified inbox
- you want OpenPGP end-to-end encryption support
- you prefer software backed by Mozilla and a large community

## When to avoid
- you need an iOS email client (Thunderbird for iOS is still in development)
- you want a heavily integrated commercial suite with calendar and contacts sync out of the box
- you need desktop email management

## Facets
- artifact type: application
- maturity: active
- function: email, security, cryptography
- domain: email, privacy, developer-tools, messaging-platforms
- platform: -
- tags: email-client, openpgp, k9-mail, unified-inbox, mozilla, open-source, android

## Member repositories
- thunderbird/thunderbird-android (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:05.067093+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:12:56.857565+00:00, confidence not recorded.
  - readme: https://github.com/thunderbird/thunderbird-android (fetched 2026-08-28T04:11:05.067093+00:00, sha 740b4fccb142)
  - homepage: https://thunderbird.net/mobile (fetched 2026-08-29T08:07:04.638515+00:00, sha 7c351fa6a445)
  - site_page: https://www.thunderbird.net/en-US/about (fetched 2026-08-29T08:07:04.644022+00:00, sha 08f27bf97907)
  - site_page: https://www.thunderbird.net/en-US/about/mission-statement (fetched 2026-08-29T08:07:04.646770+00:00, sha cc0f9a012bcb)
  - site_page: https://blog.thunderbird.net/ (fetched 2026-08-29T08:07:04.641630+00:00, sha 0374b68373ab)
  - site_page: https://www.thunderbird.net/en-US/thunderbird/releases (fetched 2026-08-29T08:07:04.648755+00:00, sha 95054ccc77ab)
- Data as of 2026-08-30T08:39:29.467469+00:00.