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Open Source Gmail Alternatives

The best open source alternative to Gmail is Proton Mail. If that doesn't suit you, our users have ranked more than 50 alternatives to Gmail and 15 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Gmail are Tutanota, Posteo, Disroot and mailbox.org.

Gmail alternatives are mainly WebMail Providers but may also be Email Clients or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Gmail.
This page was last updated Mar 29, 2022
Gmail
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  1. Secure email with absolutely no compromises, brought to you by MIT and CERN scientists.

    Proton Mail vs Gmail opinions
    Almost everyone thinks Proton Mail is a great alternative to Gmail.
     all • positive • negative      relevance • date
    wookahn624

    More secure reliable than gmail.Also beautiful UI it's open source,free...

    Top positive comment  about 5 years ago
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    12
    JohnFastman

    Protonmail is free, open-source, encrypted (more private). Lacks: calendar & good contacts feature, but these are in the pipeline. Protonmail cannot by design data-mine your software for it's own profit; Gmail makes it's money by violating your privacy that way.

    Top positive comment  over 5 years ago
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    15

    Does not support POP/IMAP, forget about using it on Thunderbird or your favorite email client.

    Top negative comment  almost 3 years ago
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    -1
    dotonion

    Because of its privacy and powerful emailing platform!

    Positive comment 8 months ago
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    0
    Sandro_Linux

    Privacy respected and just better than gmail in so many ways

    Positive comment over 1 year ago
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    1
    RemovedUser

    What makes ProtonMail the best alternative to Gmail? It is more secure, private, no invasive ads, no surveillance and lot more.

    Positive comment over 1 year ago
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    5

    It has great encryption and is very easy to switch to. Would totally recommend!

    Positive comment almost 2 years ago
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    1
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    7 of 26 comments
  2. Tutanota is a free and open source web-mail client that focuses on privacy and security. It has open source iOS and an Android apps.

    Tutanota vs Gmail opinions
    Most users think Tutanota is a great alternative to Gmail.
     all • positive • negative      relevance • date
    RemovedUser

    Privacy-respecting company, and has open source client

    Top positive comment  almost 2 years ago
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    5
    RemovedUser

    I've tried some encrypted emails to replace Gmail, it turned out that Tutanota is perfect. All services accepted it without any problems, all messages arrived fast and the free plan gives 1GB of space. Also, the paid plans are generous and cheap.

    Top positive comment  over 4 years ago
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    7
    bybbo

    Replaced successfully G.Calendar G.Contacts for me. Cheap privacy first services with no compromise on the ease of use.

    Positive comment over 1 year ago
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    0

    Very nice minimalist ui and great security features

    Positive comment over 2 years ago
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    0

    Does not support POP/IMAP, you will not be able to use it with Thunderbird or another email client.

    Negative comment almost 3 years ago
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    21
    justinterested

    Tutanota is a great email provider with very good encryption (it uses end-to-end encryption like Signal – i.e. they cannot read your emails/gife them to the government, Gmail can!) and they don't sell any data. It is also very easy to use, it has a very nice app, a desktop client and a web client. There is really no reason why you wouldn't want to use it :)

    Positive comment over 3 years ago
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    7

    This is a very good free client. It gives you lots of functionality even at no cost.

    Positive comment over 4 years ago
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    2
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    7 of 10 comments


  3. Web- and IMAP-based email service. 2GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.

    Posteo vs Gmail opinions
    Almost everyone thinks Posteo is a great alternative to Gmail.

    Posteo has very good data encryption and privacy.

    Positive comment over 4 years ago
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    4
    RemovedUser

    Very comprehensive privacy, affordable price and sustainable practice. Also provide interface for notes, calendars and contacts sync.

    Positive comment about 4 years ago
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    3
    Ariana

    Love Posteo - very good encryption and very affordable: you pay with money, not with your data. If they also supported own domains, I'd move my professional mail there as well.

    Positive comment over 5 years ago
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    -1
    RemovedUser

    The most secure and private email on the market. As such, there is not free version. This is a good thing, it means they are not making money with your information.

    Positive comment about 3 years ago
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    2
  4. Disroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization.

    Almost everyone thinks Disroot is a great alternative to Gmail.
  5. mailbox.org offers a secure e-mail account for home and business use. The domain name, me@mailbox.org, is easy to remember and can be understood anywhere in the world. They have been operating e-mail accounts for more than 20 years and are a highly reliable service provider.

    mailbox.org vs Gmail opinions
    Almost everyone thinks mailbox.org is a great alternative to Gmail.

    Privacy oriented, good value for money, multiple e-mail aliases, works well with Thunderbird

    Positive comment over 1 year ago
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    0
    JohnFastman

    At the moment, Mailbox.org is probably the best Gmail alternative: 1) You pay for the service with money, not your privacy (no data mining), 2) Excellent integration of encryption, 3) excellent Calendar and Contacts (not on mobile yet), 4) Yubikey 2FA, 5) Data stored in Germany (better privacy laws).

    Positive comment over 5 years ago
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    2
    madmonk

    Best Gmail replacement at the moment. You get all the suite functions like the calendar, address book, cloud space, apps for a fair cheap price and the priceless privacy policy and encryption without losing IMAP capabilities as with some even more privacy focused email providers like Protonmail and Tutanota.

    Positive comment over 3 years ago
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    4


  6. Horde

    • FreeOpen Source
    • Online
    • Self-Hosted

    Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.

    Discontinued

    The last release (5.2.22) was in September 2017.

    Horde vs Gmail opinions
    Some users think Horde is a great alternative to Gmail, some don't.

    Horde is a mail client, not provider

    Negative comment over 6 years ago
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    6

    Horde is included in CPanel accounts as well as Roundcube and Squirrelmail.

    Positive comment almost 5 years ago
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    0
  7. Criptext

    • Free PersonalOpen Source
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone

    Finally, an email service that's built around your privacy. Get your @criptext.com email address and see what it's like to have peace of mind and privacy in every email you send.

    Discontinued

    Creator recently sent and email about going solo, but since then support has been unresponsive, as have nearly all new issues on github for a year now if not more...

  8. systemli.org

    • FreeOpen Source
    • Online

    Systemli.org is a left network and technics-collective that was founded in 2003. Our aim is to provide safe and trustworthy communication services. The project addresses political activists and people who have a particular need to protect their data.

    No screenshots yet
  9. Teknik Mail

    • Online

    Teknik was created to provide users with web services that they can trust. Services range from url shorteners to pastebins and encrypted file uploads.

    No screenshots yet
  10. Webmail Lite

    • FreeOpen Source
    • Online
    • Self-Hosted

    Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail application, which is fast and easy to use. Whether you need a free web browser based email client software for Windows ASP.

Showing 10 of 15 alternatives