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FairEmail alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave FairEmail: android only, and no Exchange ActiveSync support. We ranked 5 alternatives by how directly each one replaces FairEmail, then by reviews, real visits and how recently each app's facts were checked against its own website. Thunderbird currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Thunderbird logoThunderbirdOpen sourceYesWindows, macOS, Linux +15 of 566.5
2Proton Mail logoProton MailFree plan + paidYesWeb, Windows, macOS +35 of 562.6
  1. Thunderbird logo

    1. ThunderbirdTop pick

    Best for: Desktop users who want a free, private, customisable mail and calendar app

    Open sourceWindows, macOS, Linux, Android

    66.5

    score / 100

    Why switch from FairEmail

    Open-source Android client (formerly K-9 Mail) with a simpler setup.

    Pros

    • Free, open source and funded by donations, with no ads
    • Built-in OpenPGP, calendar, filters and many add-ons
    • Runs on Windows, Mac, Linux and Android

    Cons

    • No web version and no released iOS app yet
    • Add-ons sometimes break after major updates
    • Exchange setups can need extra configuration
    Visit Thunderbird 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 Thunderbird a good FairEmail alternative?

    Verified facts

    5 of 5 verified
    Desktop platforms
    Windows, Linux, macOS
    Checked Oct 25, 2026thunderbird.net(opens source in a new tab)
    Price
    Free, funded by donations
    Checked Oct 25, 2026thunderbird.net(opens source in a new tab)
    Mobile app
    Open-source Android app
    Checked Oct 25, 2026thunderbird.net(opens source in a new tab)
    Android app origin
    Formerly K-9 Mail
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Android app license
    Apache-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
  2. Proton Mail logo

    2. Proton Mail

    Best for: Privacy-minded people and teams who want encrypted email without running servers

    Free plan + paidOpen sourceWeb, Windows, macOS, Linux, iOS, Android

    62.6

    score / 100

    Why switch from FairEmail

    If privacy is the goal, an encrypted provider with its own Android app.

    Pros

    • End-to-end and zero-access encryption by default
    • Open-source, audited apps on every major platform
    • Bundles with Proton VPN, Drive, Calendar and Pass

    Cons

    • Free plan has little storage and one address
    • Search and third-party integrations are more limited than Gmail
    • Using desktop clients needs the paid Bridge app
    Visit Proton Mail 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 Proton Mail a good FairEmail alternative?

    Verified facts

    5 of 5 verified
    Free plan
    Yes
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    Mail Plus price
    $4.99/month, or $3.99/month billed yearly
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    Jurisdiction
    Switzerland
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    Open source
    Yes, independently audited
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    License (web clients)
    GPL-3.0
    Checked Oct 25, 2026github.com(opens source in a new tab)

The best FairEmail alternative for…

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

Thunderbird logo

Best FairEmail alternative for most people

Thunderbird

Open-source Android client (formerly K-9 Mail) with a simpler setup.

Thunderbird logo

Best FairEmail alternative for a free option

Thunderbird

Open-source Android client (formerly K-9 Mail) with a simpler setup.

Proton Mail logo

Best FairEmail alternative for a free plan you can upgrade

Proton Mail

If privacy is the goal, an encrypted provider with its own Android app.

Thunderbird logo

Best FairEmail alternative for open source

Thunderbird

Open-source Android client (formerly K-9 Mail) with a simpler setup.

BlueMail logo

Best FairEmail alternative for Mac

BlueMail

Free Android client with Exchange support and desktop versions.

Thunderbird logo

Best FairEmail alternative for Windows

Thunderbird

Open-source Android client (formerly K-9 Mail) with a simpler setup.

Thunderbird logo

Best FairEmail alternative for Linux

Thunderbird

Open-source Android client (formerly K-9 Mail) with a simpler setup.

Gmail logo

Best FairEmail alternative for iPhone and Android

Gmail

The default Android mail app, easier to use and supports other accounts too.

Proton Mail logo

Best FairEmail alternative for working in the browser

Proton Mail

If privacy is the goal, an encrypted provider with its own Android app.

FairEmail alternatives: common questions

What is the best alternative to FairEmail?

Thunderbird ranks first right now. Open-source Android client (formerly K-9 Mail) with a simpler setup. Proton Mail and BlueMail follow it in our ranking.

Is there a free alternative to FairEmail?

Yes. Thunderbird (open source), Proton Mail (free plan + paid), BlueMail (free plan + paid) and Gmail (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to FairEmail?

Yes: Thunderbird and Proton Mail.

Which FairEmail alternatives work on Linux?

Thunderbird, Proton Mail and BlueMail run on Linux.

Why do people switch from FairEmail?

The complaints we hear most: android only; no Exchange ActiveSync support; settings can overwhelm new users.

How is this list ranked?

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