Software · Internet & communication

Betterbird

A better version of Thunderbird.

Completely free
Windows and Linux
Open source
No account

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download from the official source

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Flathub, Winget (Windows Package Manager)
License: MPL-2.0 — Open source (copyleft)confirmed by Flathub, Comptoir du Libre, Winget (Windows Package Manager)
Open source: Yes
Commercial use: Yesconfirmed by Flathub, Official plan pages (pricing, licence, terms), Winget (Windows Package Manager)
Account required: Noconfirmed by Winget (Windows Package Manager)
Credit card required: Noconfirmed by Flathub, Winget (Windows Package Manager)
Watermark: Not applicable
Ads: not documented
Platforms: Windows and LinuxEstablished by Linux: Flathub · Windows: Winget
Publisher: Betterbird Project
Latest version: 153.6.0esr-bb12 (27 October 2026)
Latest activity: 28 October 2026
Source code: github.com/Betterbird/thunderbird-patches

At a glance

Betterbird is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (MPL-2.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

About

Betterbird is a fine-tuned version of Mozilla Thunderbird, Thunderbird on steroids, if you will. Betterbird is better than Thunderbird in three ways: It contains new features exclusive to Betterbird, it contains bug fixes exclusive to Betterbird and it contains fixes that Thunderbird may ship at a later stage.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 10 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 6 November 2026
Facts collected from Comptoir du Libre (source code, licence) — 6 November 2026
Facts collected from Winget (Windows Package Manager) (credit card, account, publisher, licence, free status, platforms, commercial use, version) — 6 November 2026
Last technical check: 5 November 2026
Description from Flathub — AppStream (Flathub)

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