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Proton Mail alternatives: 6 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Proton Mail: free plan has little storage and one address, and search and third-party integrations are more limited than Gmail. We ranked 6 alternatives by how directly each one replaces Proton Mail, then by reviews, real visits and how recently each app's facts were checked against its own website. Tuta currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Tuta logoTutaFree plan + paidYesWeb, Windows, macOS +34 of 466.5
2Fastmail logoFastmailPaidNoWeb, iOS, Android5 of 562.6
3StartMail logoStartMailPaidNoWeb, iOS, Android4 of 457.2
  1. Tuta logo

    1. TutaTop pick

    Best for: People who want the most encryption for the least money and accept using Tuta's own apps

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

    66.5

    score / 100

    Why switch from Proton Mail

    Encrypts more of the mailbox, including subject lines and calendar, at a lower price.

    Pros

    • Encrypts subjects, contacts and calendars, not just bodies
    • Open-source apps on desktop, mobile and web
    • Low-cost paid plans with custom domains

    Cons

    • No IMAP, so third-party mail apps are not supported
    • Search and filtering are basic
    • Free plan has very little storage
    Visit Tuta Compare with Proton MailDetails 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 Tuta a good Proton Mail alternative?

    Verified facts

    4 of 4 verified
    Storage (Free / Revolutionary / Legend)
    1 GB / 20 GB / 500 GB
    Checked Oct 25, 2026tuta.com(opens source in a new tab)
    Encryption
    End-to-end, post-quantum
    Checked Oct 25, 2026tuta.com(opens source in a new tab)
    Family member add-on
    €3 per user/month (Revolutionary)
    Checked Oct 25, 2026tuta.com(opens source in a new tab)
    License
    GPL-3.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
  2. Fastmail logo

    2. Fastmail

    Best for: People and families who want private, ad-free email on their own domain

    PaidWeb, iOS, Android

    62.6

    score / 100

    Why switch from Proton Mail

    Not end-to-end encrypted, but faster search, better calendars and standard IMAP access.

    Pros

    • Fast web app with excellent search
    • Masked Email aliases and easy custom domains
    • Standard IMAP, CalDAV and JMAP support for any client

    Cons

    • No free plan
    • Not end-to-end encrypted
    • No desktop apps of its own
    Visit Fastmail 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 Fastmail a good Proton Mail alternative?

    Verified facts

    5 of 5 verified
    Free trial
    30 days
    Checked Oct 25, 2026fastmail.com(opens source in a new tab)
    Founded
    1999
    Checked Oct 25, 2026fastmail.com(opens source in a new tab)
    Headquarters
    Melbourne, Australia
    Checked Oct 25, 2026fastmail.com(opens source in a new tab)
    Masked Email
    Yes
    Checked Oct 25, 2026fastmail.com(opens source in a new tab)
    Data location
    EU or USA
    Checked Oct 25, 2026fastmail.com(opens source in a new tab)
  3. StartMail logo

    3. StartMail

    Best for: People who want private email with lots of aliases and simple encryption

    PaidWeb, iOS, Android

    57.2

    score / 100

    Why switch from Proton Mail

    Dutch private email with unlimited aliases and works with any IMAP client.

    Pros

    • Unlimited aliases on all plans
    • Password-protected encrypted email to anyone
    • IMAP support for any mail app

    Cons

    • No free plan
    • Fewer features and add-on services than Proton
    • Stored mail not end-to-end encrypted by default
    Visit StartMail Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    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 StartMail a good Proton Mail alternative?

    Verified facts

    4 of 4 verified
    Personal plan
    $59.88 per year
    Checked Oct 25, 2026startmail.com(opens source in a new tab)
    Free trial
    7 days
    Checked Oct 25, 2026startmail.com(opens source in a new tab)
    Aliases
    Unlimited
    Checked Oct 25, 2026startmail.com(opens source in a new tab)
    Jurisdiction
    Netherlands
    Checked Oct 25, 2026startmail.com(opens source in a new tab)

The best Proton Mail alternative for…

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

Tuta logo

Best Proton Mail alternative for most people

Tuta

Encrypts more of the mailbox, including subject lines and calendar, at a lower price.

Mailfence logo

Best Proton Mail alternative for a free plan you can upgrade

Mailfence

Belgian encrypted email with OpenPGP keys you control and a free plan.

Tuta logo

Best Proton Mail alternative for open source

Tuta

Encrypts more of the mailbox, including subject lines and calendar, at a lower price.

Tuta logo

Best Proton Mail alternative for Mac

Tuta

Encrypts more of the mailbox, including subject lines and calendar, at a lower price.

Tuta logo

Best Proton Mail alternative for Windows

Tuta

Encrypts more of the mailbox, including subject lines and calendar, at a lower price.

Tuta logo

Best Proton Mail alternative for Linux

Tuta

Encrypts more of the mailbox, including subject lines and calendar, at a lower price.

Fastmail logo

Best Proton Mail alternative for iPhone and Android

Fastmail

Not end-to-end encrypted, but faster search, better calendars and standard IMAP access.

mailbox.org logo

Best Proton Mail alternative for working in the browser

mailbox.org

German provider with PGP support and an office suite, priced per user.

Proton Mail alternatives: common questions

What is the best alternative to Proton Mail?

Tuta ranks first right now. Encrypts more of the mailbox, including subject lines and calendar, at a lower price. Fastmail and mailbox.org follow it in our ranking.

Is there a free alternative to Proton Mail?

Yes. Tuta (free plan + paid) and Mailfence (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Proton Mail?

Yes: Tuta.

Which Proton Mail alternatives work on Linux?

Tuta runs on Linux.

Why do people switch from Proton Mail?

The complaints we hear most: 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.

How is this list ranked?

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