Proton Mail AlternativesOnly Free apps categorised as Calendar Apps

The best free Calendar alternative to Proton Mail is Tuta Mail, which is also Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Proton Mail and seven of them are free Calendar Apps so hopefully you can find a suitable replacement. Other interesting free Calendar App alternatives to Proton Mail are Mailfence, Infomaniak kMail, Vivaldi Mail and Mailo.

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Proton Mail alternatives are mainly Calendar Apps, but if you're looking for WebMail Providers or Email Clients you can filter on that. Other popular filters include Free, Open Source and Self-Hosted. These are just examples - use the filter bar below to find more specific alternatives to Proton Mail.
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Alternatives list

  1. Tuta Mail icon

    Tuta Mail

     528 likes

    Offers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.

    103 Tuta Mail alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    Tuta Mail screenshot 1
     
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    10
    Comments about Tuta Mail as an Alternative to Proton Mail
    Top Positive Comment
    Advik
    3

    Tutanota is end-to-end encrypted, as well offers 1 GB mail storage on free plan. The pro plans are cheap compared to protonmail, so it's better for low budget users

    Conner Vieira
    Positive
    -2

    Tutanota has historically been a lot more transparent, and arguably has been more honest about issues and plans

    Ada Byron
    Positive
    1

    I use both, ProtonMail is more secure but also more expensive and not as user-friendly. You cannot beat the price of Tutanota for service they provide.

    3 of 10 comments
    Tuta Mail icon
    Tuta Mail icon
    • Tuta Mail is Freemium and Open SourceProton Mail is also Freemium and Open Source
    • Tuta Mail is LightweightProton Mail is not according to our users
  2. Mailfence icon

    Mailfence

     64 likes

    This secure email platform offers end-to-end encryption, a comprehensive suite with Calendar and Documents. Mailfence is inter-operable with OpenPGP services, features digital signatures, provides keystores, and available as a PWA for mobile independence while ensuring no ads, trackers, or surveillance.

    71 Mailfence alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    Mailfence screenshot 1
     
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    7
    Comments about Mailfence as an Alternative to Proton Mail
    Top Positive Comment
    PhmNguynHngThnh
    5

    Mailfence offers more functionality than Proton mail with Calendar, Document, Chat, and Group functionality. Moreover, the price is much lower than other competitors.

    Top Negative Comment
    Guest
    2

    Costs money to use with 3rd party programs.

    Review by a new / low-activity user.
    Guest
    Positive
    1

    because its free and don't need any pay and don't want phone number to sign in

    Review by a new / low-activity user.
    3 of 7 comments
    Mailfence icon
    Mailfence icon
    • Mailfence is Freemium and ProprietaryProton Mail is Freemium and Open Source
  4. Infomaniak kMail icon

    Infomaniak kMail

     42 likes

    Privacy-focused Swiss email system provides 20 GB free storage, supports custom domains and unlimited storage, syncs contacts and calendars, is ad-free, and is part of a secure productivity suite used by over a million users across Europe on all devices.

    42 Infomaniak kMail alternatives

    Cost / License

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
  5. Ad
  6. Vivaldi Mail icon

    Vivaldi Mail

     34 likes

    Vivaldi Mail is a free email service with no ads and no strings attached developed by Vivaldi Technologies. It also offers contacts and calendar features, search capabilities, folders management, WEB/POP/IMAP access, 10GB of storage capacity, 20 MB of maximum attachment size...

    101 Vivaldi Mail alternatives

    Cost / License

    • Free
    • Proprietary

    Application types

    Platforms

    • Online
    • Vivaldi
    Mail
     
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    1
    Comments about Vivaldi Mail as an Alternative to Proton Mail
    John Fastman
    Positive
    0

    Vivaldi mail offers PGP-based email encryption, similar to Protonmail. But the web client is much less well developed. However, unlike Protonmail (at the time of writing), they allow you to import your own PGP keys, which is nice (a feature Protonmail users have been demanding for years).

    Vivaldi Mail icon
    Vivaldi Mail icon
    • Vivaldi Mail is Free and ProprietaryProton Mail is Freemium and Open Source
  8. VFEmail icon

    VFEmail

     6 likes

    Free email with privacy and security.

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
     
  10. mail2world icon

    mail2world

     2 likes

    the free email that has everyone talking!.

    74 mail2world alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
     
7 of 7 Proton Mail alternatives