compare
FairEmail vs Thunderbird for Android
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | FairEmail | Thunderbird for Android |
|---|---|---|
| Language | Java | Kotlin |
| Licence | GPL-3.0 | Apache-2.0 |
| Stars | 4.7k | 14k |
| Latest | 1.2338 | K9MAIL_24_0 |
| Last push | 2026-10-02 | 2026-10-06 |
| Release cadence | about 1 day between releases | about 1 day between releases |
| Active contributors | 1 commit author on the default branch in the last 90 days | 20+ commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace Microsoft Outlook. Alternatives to Microsoft Outlook →
PartialFairEmailPrivacy-focused mail for any IMAP or POP3 account on Android; no calendar.
PartialThunderbird for AndroidMail for any IMAP or POP3 account on Android, with a unified inbox; no calendar.
FairEmail
Thunderbird for Android
- THUNDERBIRD_25_0b12026-10-05Thunderbird Beta 25.0b1pre-release
- K9MAIL_24_02026-10-05K-9 Mail 24.0
- THUNDERBIRD_24_02026-10-05Thunderbird 24.0
- K9MAIL_23_12026-09-22K-9 Mail 23.1
- THUNDERBIRD_23_12026-09-22Thunderbird 23.1
FairEmail
unsigned The latest release, 1.2338, carries no signature GitHub could verify.
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Thunderbird for Android
unsigned The latest release, K9MAIL_24_0, carries no signature GitHub could verify.
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