Open Source Gmail Alternatives

    The best open source alternative to Gmail is ProtonMail, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Gmail and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Gmail are Tutanota (Freemium, Open Source), Posteo (Paid, Open Source), Disroot (Free, Open Source) and Horde (Free, Open Source).

    The list of alternatives was last updated Apr 22, 2021

    Platforms

    • Online
    • iPhone
    • Android
    • iPad
    • Windows
    • Mac
    • Android Tablet
    • Linux
    • Self-Hosted
    • Software as a Service (SaaS)
    • Windows S
    • Chrome OS
    • OpenPGP
    • Android Wear
    • Kindle Fire
    • F-Droid
    • S/MIME
    • PureOS (Purism)
    • Blackberry 10
    • Windows Phone

    Features

    • Encrypted Email
    • Support for IMAP
    • POP3 Support
    • Privacy focused
    • Ad-free
    • CalDAV
    • Calendar
    • Custom domain
    • Email Server
    • PGP Encryption
    • Privacy protection
    • CardDAV
    • End-to-End Encryption
    • Multiple Account support
    • Integrated Spam Protection
    • SMTP
    • Built-in Calendar
    • Two factor authentication
    • Web-Based
    • Unified inbox

    License

    × Clear
    • Free
    • Open Source
    • Paid
    All Filters

    • Secure email with absolutely no compromises, brought to you by MIT and CERN scientists. View 76 alternatives to ProtonMail
      Almost everyone thinks ProtonMail is a great alternative to Gmail.
      • FreemiumOpen Source
      • Online
      • Android
      • iPhone
      • iPad
      ProtonMail vs Gmail
      pros, cons and recent comments
       all • positive • negative      relevance • date
      PavlinaKellerova One of the best options if you are concerned about privacy and want to de-Google your life.
      Top positive comment  over 2 years ago

      13
      wookahn624 More secure reliable than gmail.Also beautiful UI it's open source,free...
      Top positive comment  about 4 years ago

      11
      Does not support POP/IMAP, forget about using it on Thunderbird or your favorite email client.
      Top negative comment  almost 2 years ago

      -5
      Sandro_Linux Privacy respected and just better than gmail in so many ways
      Positive comment 6 months ago

      0
      Jinmori_Original What makes ProtonMail the best alternative to Gmail? It is more secure, private, no invasive ads, no surveillance and lot more.
      Positive comment 7 months ago

      1
      It has great encryption and is very easy to switch to. Would totally recommend!
      Positive comment 9 months ago

      0
      Open source secure and private and if you you forgot your password you can reset it but you wil not be able to see your old emails that is helpfull when you are forced to open your emails
      Positive comment 9 months ago

      1
      Show more comments
      7 of 25 comments
    • 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. View 70 alternatives to Tutanota
      Most users think Tutanota is a great alternative to Gmail.
      • FreemiumOpen Source
      • Online
      • Android
      • iPhone
      • iPad
      • Self-Hosted
      • F-Droid
      Tutanota vs Gmail
      pros, cons and recent comments
       all • positive • negative      relevance • date
      RemovedUser Privacy-respecting company, and has open source client
      Top positive comment  10 months ago

      3
      onuni Tutanota is the best choice, because it is simple and run by an awesome team. Even the Premium prices are very affordable.
      Top positive comment  over 4 years ago

      6
      Does not support POP/IMAP, you will not be able to use it with Thunderbird or another email client.
      Top negative comment  almost 2 years ago

      14
      bybbo Replaced successfully G.Calendar G.Contacts for me. Cheap privacy first services with no compromise on the ease of use.
      Positive comment 6 months ago

      0
      Very nice minimalist ui and great security features
      Positive comment over 1 year ago

      0
      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 2 years ago

      7
      This is a very good free client. It gives you lots of functionality even at no cost.
      Positive comment over 3 years ago

      2
      Show more comments
      7 of 10 comments


    • Web- and IMAP-based email service. 2GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used. View 57 alternatives to Posteo
      Almost everyone thinks Posteo is a great alternative to Gmail.
      • Online
      Posteo vs Gmail
      pros, cons and recent comments
      RemovedUser Very comprehensive privacy, affordable price and sustainable practice. Also provide interface for notes, calendars and contacts sync.
      Positive comment about 3 years ago

      3
      Posteo has very good data encryption and privacy.
      Positive comment over 3 years ago

      4
      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 2 years ago

      2
      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 about 4 years ago

      -1
    • Disroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization. View 20 alternatives to Disroot
      Almost everyone thinks Disroot is a great alternative to Gmail.
    • Horde Groupware is a free, enterprise ready, browser based collaboration suite. View 41 alternatives to Horde
      Some users think Horde is a great alternative to Gmail, some don't.
      • FreeOpen Source
      • Online
      • Self-Hosted
      Horde vs Gmail
      pros, cons and recent comments
      Horde is a mail client, not provider
      Negative comment over 5 years ago

      5
      Horde is included in CPanel accounts as well as Roundcube and Squirrelmail.
      Positive comment over 3 years ago

      0


    • Finally, an email service that's built around your privacy. Get your @criptext. View 17 alternatives to Criptext
      No screenshots yet
      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Android
      • iPhone
    • Teknik was created to provide users with web services that they can trust. Services range from url shorteners to pastebins and encrypted file uploads. View 71 alternatives to Teknik Mail
      No screenshots yet
      • Online
    • Open SourceWebMail 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... View 31 alternatives to Webmail Lite
      • FreeOpen Source
      • Online
      • Self-Hosted
    • Librem Mail – end-to-end encrypted email used by nearly everybody already* Email client with support for IMAP and POP3* Encrypt and sign your emails with OpenKeychain*... View 41 alternatives to Librem Mail
      • FreeOpen Source
      • Android
      • Android Tablet
      • PureOS (Purism)
    • Fripost – the Free Email Association. View 29 alternatives to Fripost
      No screenshots yet
      • Online
    Showing 10 of 14 alternatives