Skip to content
Alternatives.toolsSubmit a tool
Proton Mail logo

Open source Proton Mail alternatives

Top Email Clients & Providers like Proton Mail

The most popular alternative to Proton Mail is Tuta, which has a free version. Other great alternatives to Proton Mail are Thunderbird.

Most alternatives to Proton Mail are in the Email Clients & Providers category, compared here by price, platform and features.

Proton Mail alternatives
AllFreeOpen source
2 apps

All Proton Mail alternatives

  1. Tuta

    4.7(3.7K) · App Store

    Tuta, formerly Tutanota, is an open-source encrypted email and calendar service based in Germany. It encrypts mailbox contents end to end, including subject lines and contacts, and uses post-quantum cryptography for new accounts. Because it relies on its own encryption, it works through Tuta's apps rather than IMAP clients. A free plan exists, and paid plans add custom domains and more aliases.

    7 Tuta alternatives

    Pros

    • Encrypts subjects and contacts, not just message bodies
    • Post-quantum cryptography for new accounts
    • Open source apps and a free plan, with servers in Germany

    Cons

    • No IMAP support, so you must use Tuta’s own apps
    • Free plan is limited in storage and features
    • Fewer integrations and features than mainstream providers
    Cost / License
    FreemiumOpen source
    Categories
    Email Clients & Providers
    Platforms
    WebWindowsMacLinuxiPhoneAndroid
    Features
    Calendar viewCustom email domainEmail aliasesEnd-to-end encryptionGDPR compliant
    Visit websiteMore about Tuta

  2. Thunderbird

    Thunderbird is a free and open-source email client for Windows, macOS and Linux, with an Android app based on K-9 Mail. It manages multiple accounts in a unified inbox and includes a calendar, address book, chat and built-in OpenPGP encryption. Add-ons and themes customize it extensively, and it is developed by MZLA Technologies, a Mozilla Foundation subsidiary funded by user donations.

    9 Thunderbird alternatives

    Pros

    • Free and open source, funded by donations rather than ads
    • Built-in OpenPGP encryption, calendar and address book
    • Highly customizable with add-ons and themes

    Cons

    • Interface feels busier than minimalist modern clients
    • Getting the most out of it takes some setup and add-ons
    Cost / License
    FreeOpen source
    Categories
    Email Clients & Providers
    Platforms
    WindowsMacLinuxAndroid
    Features
    Ad-freeCalendar viewEnd-to-end encryptionOffline modePlugins & extensionsUnified inbox
    Visit websiteMore about Thunderbird

Proton Mail vs its alternatives at a glance

Pricing, platforms and the key features of Proton Mail, compared with its most popular alternatives.

Proton Mail vs its alternatives at a glance
AppPricingPlatformsCustom email domainEmail aliasesEnd-to-end encryptionSend laterTracker blocking
Proton MailFreemiumOpen sourceWeb, Windows, Mac, Linux, iPhone, Android
TutaFreemiumOpen sourceWeb, Windows, Mac, Linux, iPhone, Android
ThunderbirdFreeOpen sourceWindows, Mac, Linux, Android

Proton Mail alternatives: frequently asked questions

What is the best alternative to Proton Mail?

The most popular alternative to Proton Mail is Tuta: Encrypted email and calendar from Germany. Other great alternatives are Thunderbird.

Is there a free alternative to Proton Mail?

Yes, 2 alternatives are free or have a free plan, including Tuta and Thunderbird.

Is there an open source alternative to Proton Mail?

Yes, 2 open source alternatives are listed, including Tuta and Thunderbird.

Is Proton Mail free?

Proton Mail has a free plan, with paid plans that unlock more features.

Compare Proton Mail with its alternatives

Sponsored listings and products made by the publisher of this site are always labeled. How we rank · Know a good alternative? Submit it