Fastmail AlternativesOnly apps categorised as Calendar Apps

The best Calendar alternative to Fastmail is Proton Mail, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Fastmail and 11 are Calendar Apps so hopefully you can find a suitable replacement. Other interesting Calendar App alternatives to Fastmail are Tuta Mail, Posteo, Mailfence and Vivaldi Mail.

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Fastmail 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. These are just examples - use the filter bar below to find more specific alternatives to Fastmail.
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Alternatives list

  1. Proton Mail icon

    Proton Mail

     1055 likes

    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any device.

    99 Proton Mail alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Tor
    • Flathub
    • Snapcraft
    Proton Mail screenshot 1
     
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    4
    Proton Mail vs Fastmail Comments
    Gamliel Fishkin
    Positive
    5

    ProtonMail is a privacy-respecting email service.

    Ada Byron
    Positive
    0

    FastMail is great and is a good choice for many people. ProtonMail is most secure but it makes Proton not as user friendly. No bad choice, Proton most secure but not overly complicated to accomplish this. Tutanota is a happy medium. Fastmail is best for many. Doing something always better than nothing and Fastmail is happy medium many will stick with over getting tired of shortcomings of some others due to their privacy restrictions.

    Guest
    Positive
    0

    ProtonMail is an excellent, privacy supporting email provider. It's expensive but worthwhile

    Review by a new / low-activity user.
    3 of 4 comments
    • Proton Mail is Freemium and Open SourceFastmail is Paid and Proprietary
  2. Tuta Mail icon

    Tuta Mail

     542 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.

    105 Tuta Mail alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    • Android Tablet
    • Thunderbird
    Tuta Mail screenshot 1
     
    |
    3
    Tuta Mail vs Fastmail Comments
    Gamliel Fishkin
    Positive
    10

    Tutanota is a privacy-respecting email service.

    Guest
    Negative
    -2

    FastMail is an email service.

    Review by a new / low-activity user.
    philrj
    Negative
    -59

    Is an email client, not an email service provider.

    • Tuta Mail is Freemium and Open SourceFastmail is Paid and Proprietary
    • Tuta Mail is LightweightFastmail is not according to our users
  4. Posteo icon

    Posteo

     87 likes

    Web- and IMAP-based email service. 4GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.

    78 Posteo alternatives

    Cost / License

    • Paid
    • Open Source

    Application types

    Platforms

    • Online
    Drag and drop
     
  5. Ad
    Screenshot
    Proton Mail icon
    Proton Mail

    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any devi...

    https://proton.me
    Learn More
  6. Mailfence icon

    Mailfence

     65 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.

    73 Mailfence alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    Mailfence screenshot 1
     
  7. 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...

    103 Vivaldi Mail alternatives

    Cost / License

    • Free
    • Proprietary

    Application types

    Platforms

    • Online
    • Vivaldi
    Mail
     
  8. GMX icon

    GMX

     78 likes

    GMX Mail is a German-based free webmail service provided by GMX (Global Mail Exchange). In addition to an e-mail address, each GMX account includes a Mail Collector, Address Book, Organizer, and File Storage.

    64 GMX alternatives

    Cost / License

    • Free
    • Proprietary

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    GMX screenshot 1
     
  11. Kolab Now icon

    Kolab Now

     43 likes

    Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.

    77 Kolab Now alternatives

    Cost / License

    • Paid
    • Open Source

    Application types

    Platforms

    • Online
    • Software as a Service (SaaS)
    • DAVx5
    Kolab Now email
     
  12. Mailture icon

    Mailture

     Like

    Mailture, a secure, business-oriented email service, is made to cater to all your emailing needs. With top-notch collaboration and communication features, Mailture offers much more than your usual inbox.

    Cost / License

    • Paid
    • Proprietary

    Application types

    Alerts

    • Discontinued

    Platforms

    • Software as a Service (SaaS)
    Account Overview
     
  13. VFEmail icon

    VFEmail

     6 likes

    Free email with privacy and security.

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Online
     
11 of 11 Fastmail alternatives