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The Best Open Source Gmail AlternativesTop WebMail Providers & Email Clients like Gmail

The best open source alternative to Gmail is Proton Mail. If that doesn't suit you, our users have ranked more than 100 alternatives to Gmail and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Gmail are Tuta Mail, Posteo, Disroot and Infomaniak kMail.

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Most Gmail alternatives are WebMail Providers, but you can also narrow the list to Email Clients or Calendar Apps. Other popular filters are Free, Open Source, Android, EU and Self-Hosted. You can also filter for EU-based alternatives if you prefer software from the European Union.
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  1. Copy a direct link to this comment to your clipboard

    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.

    113 Proton Mail alternatives

    Cost / License

    Application typeApplication types

    Origin

    • CH flagSwitzerland

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Snapcraft
    • Flathub
    • OpenAPK
    • Tor
    Good alternative?Is Proton Mail a good alternative to Gmail?
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    35comments
    Proton Mail vs Gmail Comments

    Top Positive Comment by John Fastman ·

    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.

    Positive comment by Raposu ·

    Better than Gmail but i prefer tuta because they are more focused in FOSS alternatives, where as proton have some propietary services and didn't care as much of other stuff (as windows usage) But great improvement over gmail, for sure!

    Positive comment by Shaz Shah ·

    Proton Mail is my primary email and I have been moving away from GMail. In fact I do pay for it.

    Proton Mail has been reliable and their support has been great. The UI is different and pleasant, and they have apps that cater for different platforms (Windows, macOS, Android, etc).

    3 of 35 comments

    • Proton Mail is Freemium and Open SourceGmail is Free and Proprietary
    • Proton Mail is Privacy focusedGmail is not according to our users
  2. Copy a direct link to this comment to your clipboard

    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.

    113 Tuta Mail alternatives

    Cost / License

    Application typeApplication types

    Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Flathub
    • F-Droid
    • OpenAPK
    • Thunderbird
    • DE flagGermany
    • European Union flagEU
    Tuta Mail screenshot 1
    Tuta Mail screenshot 2
    Tuta Mail screenshot 3
    Good alternative?Is Tuta Mail a good alternative to Gmail?
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    14comments
    Tuta Mail vs Gmail Comments

    Top Positive Comment by 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 :)

    Top Negative Comment by Guest ·

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

    Positive comment by Raposu ·

    Works great and it will be a great substitute for someone looking to fully degoogle (They even use their own push service rather than Playstore's and they always support FOSS stuff as Linux, GrapheneOS and others...) If you just want your own mail and calendar this is perfect, E2EE. without AI and with their own apps :D

    3 of 14 comments

    • Tuta Mail is Freemium and Open SourceGmail is Free and Proprietary
    • Tuta Mail is Privacy focused and LightweightGmail is not according to our users
  4. Copy a direct link to this comment to your clipboard

    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

    Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Online
    • DE flagGermany
    • European Union flagEU
    Drag and drop
    Good alternative?Is Posteo a good alternative to Gmail?
    |
    7comments
    Posteo vs Gmail Comments

    Top Positive Comment by Raposu ·

    Works well but it isn't for beginners (normies). Use this if you are tech-savy

    Top Negative Comment by Guest ·

    Lack of labels - only folders. Poor and broken search function on web client (seems to scramble email details in results?) Unable to send through external addresses. Does not group multiple separate emails from same sender. No multiple star colours

    Positive comment by venture2935 ·

    Not as robust as Gmail but good enough if all you need is basic stuff.

    Cheap and focused on renewables

    3 of 7 comments

    • Posteo is Paid and Open SourceGmail is Free and Proprietary
    • Posteo is Privacy focused and Security-focusedGmail is not according to our users
  6. Copy a direct link to this comment to your clipboard

    Disroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization.

    47 Disroot alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Origin

    • NL flagNetherlands
    • European Union flagEU

    Platforms

    • Online
    • F-Droid
    • NL flagNetherlands
    • European Union flagEU
    Disroot screenshot 1
    Good alternative?Is Disroot a good alternative to Gmail?
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    1comment
    Disroot vs Gmail Comments

    Positive comment by Infinity64 ·

    It's open-source, easy to use, compatible with IMAP, and not spying on you. To top it off, it also supports encryption and PGP!

    1 of 1 comments

    • Disroot is Free and Open SourceGmail is Free and Proprietary
    • Disroot is Privacy focused and DecentralizedGmail is not according to our users
  7. Copy a direct link to this comment to your clipboard

    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

    Application typeApplication types

    Origin

    • CH flagSwitzerland

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Good alternative?Is Infomaniak kMail a good alternative to Gmail?
    |
    3comments
    Infomaniak kMail vs Gmail Comments

    Positive comment by Guest ·

    You have all the functions you need in workspace, like Gmail. Fully customizable, high security. This product is professional. I use it since 2 year, and I don't want to return to Gmail. Only one point : you need a domain name. But it's more original like a Gmail.com address...

    Positive comment by hb9vaf ·

    I very good alternative for mail, contact & agenda

    Positive comment by ImSebi ·

    Much better than Gmail. And now you don't need a domain anymore, it's free for everyone.

    3 of 3 comments

    • Infomaniak kMail is Freemium and Open SourceGmail is Free and Proprietary
    • Infomaniak kMail is Privacy focusedGmail is not according to our users
  9. Copy a direct link to this comment to your clipboard

    Cloudflare Workers-based email solution providing multiple address generation, attachment storage via R2, responsive web interface, RBAC management, Resend bulk email, Telegram or third-party forwarding, verification code recognition, and ECharts analytics.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Origin

    • CN flagChina

    Platforms

    • Self-Hosted
    Good alternative?Is Cloud Mail a good alternative to Gmail?
  10. Copy a direct link to this comment to your clipboard

    Forward Email is the best email service, encrypted email service, and fastest email service. It supports unlimited domains and aliases for no extra cost. It uses quantum safe ChaCha20-Poly1305 encryption and offers SMTP, IMAP, POP3, email webhooks, email regular expressions...

    46 Forward Email alternatives

    Cost / License

    Application type

    Origin

    • US flagUnited States

    Platforms

    • Self-Hosted
    • Online
    • US flagUnited States
    Forward Email screenshot 1
    Good alternative?Is Forward Email a good alternative to Gmail?
  11. Copy a direct link to this comment to your clipboard

    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.

    86 Kolab Now alternatives

    Cost / License

    • Paid
    • Open Source

    Application typeApplication types

    Origin

    • CH flagSwitzerland

    Platforms

    • Online
    • Software as a Service (SaaS)
    • DAVx5
    Good alternative?Is Kolab Now a good alternative to Gmail?
  12. Copy a direct link to this comment to your clipboard

    Swisscows.email is another product of Swisscows AG. This product offers you secure email traffic. With Swisscows.email you can send your emails encrypted so that absolutely no one can read them. The service is comparable to a letter that is protected from prying eyes in an...

    64 Swisscows.email alternatives

    Cost / License

    • Paid
    • Open Source

    Application typeApplication types

    Origin

    • CH flagSwitzerland

    Platforms

    • Online
    • iPhone
    • iPad
    • Android
    • Android Tablet
    Good alternative?Is Swisscows.email a good alternative to Gmail?
  14. Copy a direct link to this comment to your clipboard

    Galae is a secure email service focused on deliverability, self-management and interoperability. It totally relies on free/libre opensource software.

    57 Galae alternatives

    Cost / License

    Application type

    Origin

    • FR flagFrance
    • European Union flagEU

    Platforms

    • Online
    • Software as a Service (SaaS)
    Good alternative?Is Galae a good alternative to Gmail?
  15. Copy a direct link to this comment to your clipboard

    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.

    25 systemli.org alternatives

    Cost / License

    • Free
    • Open Source

    Platforms

    • Online
    Good alternative?Is systemli.org a good alternative to Gmail?
12 of 22 Gmail alternatives

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