Thunderbird alternatives: 6 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Thunderbird: no web version and no released iOS app yet, and add-ons sometimes break after major updates. We ranked 6 alternatives by how directly each one replaces Thunderbird, then by reviews, real visits and how recently each app's facts were checked against its own website. Mailspring currently ranks first.

Quick comparison

#	App	Pricing	Open source	Platforms	Verified facts	Score
1	Mailspring	Free plan + paid	Yes	macOS, Windows, Linux	4 of 4	66.5
2	NeoMutt	Open source	Yes	Linux, macOS	4 of 4	55.3

1. MailspringTop pick
Best for: Desktop users, especially on Linux, who want a modern free client
Free plan + paidOpen sourcemacOS, Windows, Linux
66.5
score / 100
Why switch from Thunderbird
An open-source desktop client with a more modern look and optional Pro features.
Pros
Free and open source on Mac, Windows and Linux
Clean interface with themes and keyboard shortcuts
Pro adds tracking, templates and send later at a low price
Cons
No mobile apps
Small team, so features arrive slowly
Limited native Exchange support
Visit Mailspring Details and reviews
How this score is calculated
Editorial fit ×0.3100
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.1585
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is Mailspring a good Thunderbird alternative?
Verified facts
4 of 4 verified
License
GPL-3.0
Checked Oct 25, 2026github.com(opens source in a new tab)
Pro price
$8 per month
Checked Oct 25, 2026getmailspring.com(opens source in a new tab)
Platforms
Mac, Windows, Linux
Checked Oct 25, 2026getmailspring.com(opens source in a new tab)
Pro features
Read receipts, link tracking, send later
Checked Oct 25, 2026getmailspring.com(opens source in a new tab)
2. NeoMutt
Best for: Developers and terminal users who want a fast, scriptable mail client
Open sourceLinux, macOS
55.3
score / 100
Why switch from Thunderbird
A terminal mail reader for people who want full keyboard control and scripting.
Pros
Fully keyboard-driven and highly scriptable
Works with IMAP, Maildir and tools like notmuch
Free, open source and very lightweight
Cons
Steep learning curve and lengthy setup
HTML email is awkward in a terminal
No graphical interface or mobile version
Visit NeoMutt Details and reviews
How this score is calculated
Editorial fit ×0.363
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.1585
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Is NeoMutt a good Thunderbird alternative?
Verified facts
4 of 4 verified
License
GPL-2.0
Checked Oct 25, 2026github.com(opens source in a new tab)
Type
Command-line mail reader
Checked Oct 25, 2026neomutt.org(opens source in a new tab)
Origin
Fork of Mutt
Checked Oct 25, 2026neomutt.org(opens source in a new tab)
Configuration
Highly configurable, with sample config files
Checked Oct 25, 2026neomutt.org(opens source in a new tab)

The best Thunderbird alternative for…

The highest-ranked app in this list for each need.

Best Thunderbird alternative for most people

Mailspring

An open-source desktop client with a more modern look and optional Pro features.

Best Thunderbird alternative for a free option

FairEmail

Open-source, privacy-focused Android client with very deep settings.

Best Thunderbird alternative for a free plan you can upgrade

eM Client

A polished Windows and Mac client with strong Exchange and calendar support.

Best Thunderbird alternative for open source

Geary

A lighter, conversation-based open-source client for the GNOME desktop.

Best Thunderbird alternative for Mac

NeoMutt

A terminal mail reader for people who want full keyboard control and scripting.

Best Thunderbird alternative for Windows

BlueMail

A free cross-platform client that also covers iOS, which Thunderbird does not yet.

Best Thunderbird alternative for Linux

Mailspring

An open-source desktop client with a more modern look and optional Pro features.

Best Thunderbird alternative for iPhone and Android

BlueMail

A free cross-platform client that also covers iOS, which Thunderbird does not yet.

Thunderbird alternatives: common questions

What is the best alternative to Thunderbird?

Mailspring ranks first right now. An open-source desktop client with a more modern look and optional Pro features. eM Client and FairEmail follow it in our ranking.

Is there a free alternative to Thunderbird?

Yes. Mailspring (free plan + paid), eM Client (free plan + paid), FairEmail (open source) and Geary (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Thunderbird?

Yes: Mailspring, FairEmail, Geary and NeoMutt.

Which Thunderbird alternatives work on Linux?

Mailspring, Geary, NeoMutt and BlueMail run on Linux.

Why do people switch from Thunderbird?

The complaints we hear most: no web version and no released iOS app yet; add-ons sometimes break after major updates; exchange setups can need extra configuration.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Thunderbird, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.