Content and publishing · Independent · 24 Oct 2026

thunderbird/thunderbird-android

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

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In simple English

This is an email app for your phone that keeps your private data away from big tech companies. You can check all your email accounts in one single inbox or keep them separate. It costs nothing to download and use. The team behind it builds on the older K-9 Mail project to give you a reliable experience. You do not need to pay anything or run a server to use it.

What it is

Thunderbird for Android is a privacy-focused mobile email client built on open-source code and supported by donations. It lets you connect multiple email services and manage your messages without ads or data tracking.

What it is good for

This app removes the need to use default phone mail apps that track your reading habits and show advertisements.

Stars14k
LicenceApache-2.0
LatestK9MAIL_24_0 (2026-10-05)checked 24 Oct 2026
Last code change2026-10-22
Written inKotlin
Setup effort
1 / 5
Payoff
4 / 5
Good
  • Brings multiple email accounts together into a single unified inbox.
  • Focuses on user privacy without tracking your personal data.
  • Free to use and built on open-source code with active development.
Watch for
  • Requires an Android phone to run.
  • May take some time to configure multiple custom email servers.
  • Relies entirely on donations and community support for updates.
Replaces

Default smartphone email apps

Works well with

Mozilla Thunderbird

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How to get it

Download Thunderbird for Android directly from Google Play, F-Droid, or the GitHub releases page.

Independent: reviewed for Repo Radar outside the daily editions. Every independent repository

On Stack Radar: Productivity & Collaboration › Email & Team Communication › Email Clients.

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