Betterbird

Spec sheet

Purpose

The project aims to improve the Thunderbird user experience by fixing bugs and adding features.Read 11 Oct 2026 · betterbird.eu

Product

Betterbird is a fine-tuned soft fork of Mozilla Thunderbird that follows Thunderbird Extended Support Releases.Read 11 Oct 2026 · betterbird.eu

Platforms

Downloads are available for Windows, Linux, and Mac; current Mac builds are not notarised.Read 11 Oct 2026 · betterbird.eu

Free plan

YesRead 20 Sep 2026 · betterbird.eu

Integrations

The project says 98% of add-ons that run in Thunderbird will run in Betterbird, and add-ons can be installed from addons.thunderbird.net.Read 11 Oct 2026 · betterbird.eu

Security

The project says no telemetry or crash reports are submitted, while add-on updates and blocklists are downloaded from Mozilla sites.Read 11 Oct 2026 · betterbird.eu

Support

The team helps with bugs but says it cannot provide ordinary account setup, profile management, configuration, or individual troubleshooting support for free.Read 11 Oct 2026 · betterbird.eu

App coverage

desktopRead 20 Sep 2026 · betterbird.eu

Calendar tools

YesRead 20 Sep 2026 · betterbird.eu

Code signing

The project says Windows binaries have been signed with a code-signing certificate since February 2026.Read 11 Oct 2026 · betterbird.eu

Compatibility

Betterbird is designed to share a profile with the matching Thunderbird ESR version, though Thunderbird does not recognize Betterbird complex search terms.Read 11 Oct 2026 · betterbird.eu

Data handling

Betterbird says email content is sent to the user's configured mail servers and not to Betterbird, Mozilla, or unrelated external servers.Read 11 Oct 2026 · betterbird.eu

Limits

The project says profiles on network drives are only partly supported and profiles in Dropbox folders do not work.Read 11 Oct 2026 · betterbird.eu

Mail handling

Features include changing message threading, attaching recent files, and showing attachments above the message.Read 11 Oct 2026 · betterbird.eu

Mail views

Betterbird includes a multi-line message view, vertical tabs, account colors, and additional window layouts.Read 11 Oct 2026 · betterbird.eu

Scheduled sending

YesRead 20 Sep 2026 · betterbird.eu

Search

Betterbird supports complex search terms and regular expressions in search terms.Read 11 Oct 2026 · betterbird.eu

Security updates

The project warns against using old versions because they have unpatched security vulnerabilities.Read 11 Oct 2026 · betterbird.eu

Source code

The project administers a public GitHub repository for its Betterbird changes to Thunderbird.Read 11 Oct 2026 · betterbird.eu

Unified inbox

YesRead 20 Sep 2026 · betterbird.eu

Plans and prices

Every Betterbird plan and price →

Where Specifiction places it

• Email clients#31 of 1428.4