compare
Mailspring vs Thunderbird for Android
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Mailspring | Thunderbird for Android |
|---|---|---|
| Language | TypeScript | Kotlin |
| Licence | GPL-3.0 | Apache-2.0 |
| Stars | 18k | 14k |
| Latest | 1.26.0 | K9MAIL_24_0 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | about 9 days between releases | about 1 day between releases |
| Active contributors | 23 commit authors 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 →
PartialMailspringDesktop mail for IMAP, Gmail and Office 365 accounts on Windows, macOS and Linux, without a calendar.
PartialThunderbird for AndroidMail for any IMAP or POP3 account on Android, with a unified inbox; no calendar.
Mailspring
- 1.26.02026-10-02This is a major sync reliability release - The sync engine now tracks every folder a message lives in, rather than forc…
- 1.25.02026-09-19Features:
- 1.24.12026-09-15On Linux, Mailspring 1.24.1 fixed accounts being lost after upgrading when the KWallet secret name changed. Mailspring…
- 1.24.02026-09-13Note: The Flatpak version of Mailspring now uses Portal for secret storage, and you may be prompted to re-authenticate…
- 1.23.02026-07-22Features:
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
Mailspring
unsigned The latest release, 1.26.0, 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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