Proton Mail AlternativesOnly apps categorised as Calendar Apps

Alternatives list

1. 

   

   Mailfence

   Sponsored

   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.

   78 Mailfence alternatives

   Cost / License

   • Freemium
   • Proprietary

   Application typeApplication types

   • WebMail Provider
   • Email Client

   Origin

   • Belgium
   • EU

   Platforms

   • Online
   • Android
   • iPhone
   • Android Tablet
   • iPad

   • Belgium
   • EU

   

   

   

   +9

   

   Visit Mailfence  
2. 

   

   Tuta Mail

    581 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.

   112 Tuta Mail alternatives

   Cost / License

   • Freemium
   • Open Source (GPL-3.0)

   Application typeApplication types

   • WebMail Provider
   • Email Client

   Origin

   • Germany
   • EU

   Platforms

   • Mac
   • Windows
   • Linux
   • Online
   • Android
   • iPhone
   • Android Tablet
   • iPad
   • Flathub
   • F-Droid
   • Thunderbird
   • OpenAPK

   • Germany
   • EU

   

   

   

   +1

   

   More about Tuta Mail  

   

   Good alternative?Is Tuta Mail a good alternative to Proton Mail?

    

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   10comments

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   Tuta Mail vs Proton Mail Comments

   Top Positive Comment by Belsima · May 21, 2018

   Functions on secure browsers like Klar and Tor.

   Positive comment by Advik · Feb 1, 2022

   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

   Positive comment by Conner Vieira · Sep 13, 2021

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

   3 of 10 comments

   

   

   • 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
3. 

   

   Posteo

    92 likes

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

   85 Posteo alternatives

   Cost / License

   • Paid
   • Open Source

   Application typeApplication types

   • WebMail Provider
   • Email Client

   Origin

   • Germany
   • EU

   Platforms

   • Online

   • Germany
   • EU

   

   

   

   +9

   

   More about Posteo  

   

   Good alternative?Is Posteo a good alternative to Proton Mail?

    

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   1comment

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   Posteo vs Proton Mail Comments

   Positive comment by John Fastman · Apr 28, 2018

   Posteo could be a good Protonmail alternative. It offers email encryption in a similar way: Posteo's people, government surveillance and successful hackers won't get into your email content. It also offers a calendar feature, which protonmail users have been crying out for for years.

   1 of 1 comments

   

   

   • Posteo is Paid and Open SourceProton Mail is Freemium and Open Source
   • Posteo is Security-focusedProton Mail is not according to our users
5. 

   

   mailbox

    77 likes

   E-mail inbox, online office, cloud storage, and video conferencing. Business or personal plans. From 1 € /month (1.10 USD).

   90 mailbox alternatives

   Cost / License

   • Paid
   • Proprietary (AGPL-3.0)

   Application typeApplication types

   • WebMail Provider
   • Email Client

   Origin

   • Germany
   • EU

   Platforms

   • Online

   • Germany
   • EU

   

   

   

   +3

   

   More about mailbox  

   

   Good alternative?Is mailbox a good alternative to Proton Mail?

    

   |

   1comment

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   mailbox vs Proton Mail Comments

   Positive comment by John Fastman · Dec 24, 2016

   Mailbox.org is a partial replacement for Protonmail. It offers a fully functional email solution (email, calendar, contacts), but with the added benefits of PGP encryption support (you can handle the keys or let them do it). It also allows you to send links to people who don't use PGP if you want to send private messages. For the encryption, it's a bit like Protonmail. For everything else, it's like a privacy-respecing Gmail alternative.

   1 of 1 comments

   

   

   • mailbox is Paid and ProprietaryProton Mail is Freemium and Open Source
   • mailbox is Security-focusedProton Mail is not according to our users
6. Ad

   

   

   Infomaniak kMail

   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 acro...

   https://www.infomaniak.com

   Learn More
7. 

   

   Fastmail

    82 likes

   Fastmail offers secure email hosting with comprehensive webmail services, including IMAP, POP, and SMTP protocols. It supports file sharing, shared folders, large mailboxes, instant messaging, and is compatible with popular email programs. Excellent for businesses with compliance features.

   85 Fastmail alternatives

   Cost / License

   • Paid
   • Proprietary

   Application typeApplication types

   • WebMail Provider
   • Mail Server

   Origin

   • Australia

   Platforms

   • Mac
   • Windows
   • Linux
   • Online
   • Android
   • iPhone
   • Android Tablet
   • iPad
   • Flathub
   • Flatpak

   • Australia

   

   

   

   +6

   

   More about Fastmail  

   

   Good alternative?Is Fastmail a good alternative to Proton Mail?

    
8. 

   

   Infomaniak kMail

    51 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.

   Cost / License

   • Freemium
   • Open Source (GPL-3.0)

   Application typeApplication types

   • WebMail Provider
   • Email Client

   Origin

   • Switzerland

   Platforms

   • Online
   • Android
   • iPhone
   • Android Tablet
   • iPad
   • F-Droid

   • Switzerland

   

   

   

   +8

   

   More about Infomaniak kMail  

   

   Good alternative?Is Infomaniak kMail a good alternative to Proton Mail?

    
10. 

    

    Vivaldi Mail

     36 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...

    108 Vivaldi Mail alternatives

    Cost / License

    • Free
    • Proprietary

    Application typeApplication types

    • WebMail Provider
    • Email Client

    Origin

    • Norway

    Platforms

    • Online
    • Vivaldi

    • Norway

    

    

    

    +2

    

    More about Vivaldi Mail  

    

    Good alternative?Is Vivaldi Mail a good alternative to Proton Mail?

     

    |

    1comment

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    Vivaldi Mail vs Proton Mail Comments

    Positive comment by John Fastman · Apr 28, 2018

    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).

    1 of 1 comments

    

    

    • Vivaldi Mail is Free and ProprietaryProton Mail is Freemium and Open Source
11. 

    

    Mailo

     26 likes

    The mail service which respects you.

    91 Mailo alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application typeApplication types

    • WebMail Provider
    • Email Client

    Origin

    • France
    • EU

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • OpenPGP

    • France
    • EU

    

    

    

    +3

    

    More about Mailo  

    

    Good alternative?Is Mailo a good alternative to Proton Mail?

     
12. 

    

    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.

    Cost / License

    • Paid
    • Open Source

    Application typeApplication types

    • WebMail Provider
    • Mail Server

    Origin

    • Switzerland

    Platforms

    • Online
    • Software as a Service (SaaS)
    • DAVx5

    • Switzerland

    

    

    

    More about Kolab Now  

    

    Good alternative?Is Kolab Now a good alternative to Proton Mail?

     
13. 

    

    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 typeApplication types

    • WebMail Provider
    • Email Client

    Origin

    • United Kingdom

    Alerts

    • Discontinued

    Platforms

    • Software as a Service (SaaS)

    • United Kingdom

    

    More about Mailture  

    

    Good alternative?Is Mailture a good alternative to Proton Mail?

     
14. 

    

    mail2world

     3 likes

    the free email that has everyone talking!.

    72 mail2world alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application typeApplication types

    • WebMail Provider
    • Calendar

    Origin

    • United States

    Platforms

    • Online

    

    Good alternative?Is mail2world a good alternative to Proton Mail?

     
15. 

    

    VFEmail

     6 likes

    Free email with privacy and security.

    55 VFEmail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application typeApplication types

    • WebMail Provider
    • Calendar

    Platforms

    • Online

    

    Good alternative?Is VFEmail a good alternative to Proton Mail?

     
16. 

    

    LC-Connect

     Like

    Secure all-in-one collaboration platform that combines email, calendars, tasks, contacts, chat, and video meetings for teams and businesses.

    Cost / License

    • Paid
    • Proprietary

    Application typeApplication types

    • WebMail Provider
    • Email Client

    Origin

    • Germany
    • EU

    Platforms

    • Online
    • Software as a Service (SaaS)

    • Germany
    • EU

    

    

    

    More about LC-Connect  

    

    Good alternative?Is LC-Connect a good alternative to Proton Mail?