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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

#AppPricingOpen sourcePlatformsVerified factsScore
1Mailspring logoMailspringFree plan + paidYesmacOS, Windows, Linux4 of 466.5
2eM Client logoeM ClientFree plan + paidNoWindows, macOS4 of 462.6
3BlueMail logoBlueMailFree plan + paidNoWindows, macOS, Linux +24 of 453.6
  1. Mailspring logo

    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. eM Client logo

    2. eM Client

    Best for: Windows and Mac users who want Outlook-level features without Outlook

    Free plan + paidWindows, macOS

    62.6

    score / 100

    Why switch from Thunderbird

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

    Pros

    • Mail, calendar, tasks and contacts in one desktop app
    • Built-in PGP and strong Exchange support
    • Option to buy a one-time license

    Cons

    • Free version limited to home use and two accounts
    • No Linux version
    • Business licensing is per device
    Visit eM Client Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    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 eM Client a good Thunderbird alternative?

    Verified facts

    4 of 4 verified
    Free version
    Home use, 1 device, 2 accounts
    Checked Oct 25, 2026emclient.com(opens source in a new tab)
    Platforms
    Windows and macOS
    Checked Oct 25, 2026emclient.com(opens source in a new tab)
    Free trial
    30 days
    Checked Oct 25, 2026emclient.com(opens source in a new tab)
    License options
    Yearly subscription or one-time payment
    Checked Oct 25, 2026emclient.com(opens source in a new tab)
  3. BlueMail logo

    3. BlueMail

    Best for: People who want the same free mail app on every device, including Linux

    Free plan + paidWindows, macOS, Linux, iOS, Android

    53.6

    score / 100

    Why switch from Thunderbird

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

    Pros

    • Runs on iOS, Android, Mac, Windows and Linux
    • Free personal plan with unlimited accounts
    • Built-in PGP encryption

    Cons

    • Busy interface with many options
    • Some sync goes through the vendor's servers
    • Upgrade prompts in the free version
    Visit BlueMail Details and reviews
    How this score is calculated
    Editorial fit ×0.357
    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 BlueMail a good Thunderbird alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Yes, unlimited accounts
    Checked Oct 25, 2026bluemail.me(opens source in a new tab)
    Platforms
    iOS, Android, macOS, Windows, Linux
    Checked Oct 25, 2026bluemail.me(opens source in a new tab)
    Encryption
    PGP
    Checked Oct 25, 2026bluemail.me(opens source in a new tab)
    Plus free trial
    7 days
    Checked Oct 25, 2026bluemail.me(opens source in a new tab)

The best Thunderbird alternative for…

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

Mailspring logo

Best Thunderbird alternative for most people

Mailspring

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

FairEmail logo

Best Thunderbird alternative for a free option

FairEmail

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

eM Client logo

Best Thunderbird alternative for a free plan you can upgrade

eM Client

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

Geary logo

Best Thunderbird alternative for open source

Geary

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

NeoMutt logo

Best Thunderbird alternative for Mac

NeoMutt

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

BlueMail logo

Best Thunderbird alternative for Windows

BlueMail

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

Mailspring logo

Best Thunderbird alternative for Linux

Mailspring

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

BlueMail logo

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.