Gmail AlternativesOnly Open Source apps categorised as WebMail Providers

The best open source WebMail Provider alternative to Gmail is Proton Mail. If that doesn't suit you, our users have ranked more than 50 alternatives to Gmail and 14 are open source WebMail Providers so hopefully you can find a suitable replacement. Other interesting open source WebMail Provider alternatives to Gmail are Tuta Mail, Posteo, Disroot and Infomaniak kMail.

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Gmail alternatives are mainly WebMail Providers, but if you're looking for Email Clients or Calendar Apps you can filter on that. Other popular filters include Open Source, Free, Android + Free, Android, Android + Open Source, EU and Linux. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Gmail.
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Alternatives list

  1. Proton Mail icon

    Proton Mail

     1017 likes
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    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.

    98 Proton Mail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Tor
    • Flathub
    • Snapcraft
    Proton Mail screenshot 1
     
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    34
    428
    Comments about Proton Mail as an Alternative to Gmail
    Comment summary: ProtonMail is praised for its open-source nature, strong privacy features, and encryption, setting it apart from Gmail. Users appreciate its ad-free experience and security focus, with many endorsing it as a free and reliable alternative. Although some note its slower feature development and limited free storage, many consider the Swiss-based service to provide substantial user data protection, leading to strong recommendations for those concerned about privacy.
    Top Positive Comment
    John Fastman
    19

    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.

    Shaz Shah
    Positive
    1

    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).

    Charlignon
    1

    Protonmail is pretty great for all reasons listed. BUT it has two major drawbacks that you need to be aware of :

    • Account may be deleted due to inactivity (1 year - free plan) -SMTP (for apps like K9 mails or Thunderbird) requires additional setup, and is not available on mobile devices These were deal breakers for my use cases
    Show more comments
    3 of 34 comments
    Gmail Icon
    Proton Mail icon

    • Almost everyone thinks Proton Mail is a great Gmail alternative.

    • Proton Mail is the most popular Web-based, Windows, Android & Mac alternative to Gmail.

    • Proton Mail is the most popular Open Source & free alternative to Gmail.

    • Proton Mail is Freemium and Open SourceGmail is Free and Proprietary
    • Proton Mail is Privacy focusedGmail is not according to our users
  2. Tuta Mail icon

    Tuta Mail

     516 likes
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    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.

    103 Tuta Mail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    Tuta Mail screenshot 1
     
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    13
    157
    Comments about Tuta Mail as an Alternative to Gmail
    Comment summary: Tutanota is generally praised for its privacy-focused approach, offering end-to-end encryption and not selling user data, which contrasts with Gmail's monetization model. Users appreciate the easy-to-use interface, minimal design, and affordable premium plans. However, there are some concerns about occasional account deletion and the lack of POP/IMAP support, which limits compatibility with some email clients like Thunderbird.
    Top Positive Comment
    justinterested
    8

    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
    kendo friendo
    1

    AVOID. Deleted my account for not using it, but I had it tied to important accounts. The only way to get the email address back is to buy a paid account.

    alttosgt
    Positive
    0

    Tuta Mail is NOT self hosted despite claim on AlternativeTo

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    3 of 13 comments
    Gmail Icon
    Tuta Mail icon

    • Almost everyone thinks Tuta Mail is a great Gmail alternative.

    • 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. Posteo icon

    Posteo

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

    74 Posteo alternatives

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

    • Online
    Drag and drop
     
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    5
    35
    Comments about Posteo as an Alternative to Gmail
    Top Positive Comment
    RemovedUser
    1

    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.

    Review by a new / low-activity user.
    Top Negative Comment
    Guest
    0

    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

    Review by a new / low-activity user.
    RemovedUser
    Positive
    3

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

    Review by a new / low-activity user.
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    3 of 5 comments
    Gmail Icon
    Posteo icon

    • Almost everyone thinks Posteo is a great Gmail alternative.

    • Posteo is Paid and Open SourceGmail is Free and Proprietary
    • Posteo is Privacy focused and Security-focusedGmail is not according to our users
  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. Disroot icon

    Disroot

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

    44 Disroot alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • F-Droid
    Disroot screenshot 1
     
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    1
    24
    Comments about Disroot as an Alternative to Gmail
    Infinity64
    Positive
    1

    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!

    Gmail Icon
    Disroot icon

    • Almost everyone thinks Disroot is a great Gmail alternative.

    • Disroot is Free and Open SourceGmail is Free and Proprietary
    • Disroot is Privacy focusedGmail is not according to our users
  7. Infomaniak kMail icon

    Infomaniak kMail

     38 likes
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    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.

    42 Infomaniak kMail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
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    3
    Comments about Infomaniak kMail as an Alternative to Gmail
    ImSebi
    Positive
    0

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

    hb9vaf
    Positive
    0

    I very good alternative for mail, contact & agenda

    Review by a new / low-activity user.
    Guest
    Positive
    1

    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...

    Review by a new / low-activity user.
    Gmail Icon
    Infomaniak kMail icon
    • Infomaniak kMail is Freemium and Open SourceGmail is Free and Proprietary
    • Infomaniak kMail is Privacy focusedGmail is not according to our users
  8. Forward Email icon

    Forward Email

     6 likes
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    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...

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Online
    Forward Email screenshot 1
     

    • Forward Email is the most popular Self-Hosted alternative to Gmail.

    • Forward Email is Freemium and Open SourceGmail is Free and Proprietary
    • Forward Email is Privacy focusedGmail is not according to our users
  10. Zero Email icon

    Zero Email

     4 likes
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    Zero is an open-source AI email solution that gives users the power to self-host their own email app while also integrating external services like Gmail and other email providers. Our goal is to modernize and improve emails through AI agents to truly modernize emails.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Docker
    Zero Email screenshot 1
     
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    1
    Comments about Zero Email as an Alternative to Gmail
    TheEmperorArt
    Negative
    1

    I might be missing something, but Zero Email requires you to have a google account/email to use. This is not a replacement.

    Gmail Icon
    Zero Email icon
    • Zero Email is Free and Open SourceGmail is Free and Proprietary
  11. Galae icon

    Galae

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

    Cost / License

    • Subscription
    • Open Source

    Application type

    Platforms

    • Online
    • Software as a Service (SaaS)
     
  12. Webmail Lite icon

    Webmail Lite

     17 likes
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    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.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    Afterlogic Webmail Lite
     
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    1
    Comments about Webmail Lite as an Alternative to Gmail
    Rasheed AZ
    Negative
    1

    Webmail lite is a front end for email servers. They're not an email provider!

    Gmail Icon
    Webmail Lite icon
    • Webmail Lite is Free and Open SourceGmail is Free and Proprietary
    • Webmail Lite is LightweightGmail is not according to our users
  13. Fripost icon

    Fripost

     5 likes
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    Fripost – the Free Email Association. Fripost organize the people who want an alternative to "free" e-mail services where you are constantly under surveillance and personal data is handed over to third parties.

    Cost / License

    • Paid
    • Open Source

    Application types

    Platforms

    • Online
     
  14. Iroco icon

    Iroco

     Like
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    Opensource email which cares about your privacy. Developed and hosted in France.

    Cost / License

    • Subscription
    • Open Source

    Application type

    Platforms

    • Online
     
  15. Inout Webmail icon

    Inout Webmail

     Like
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    Developed to assist small/medium sized business for business emails just like Gmail or Outlook.

    Cost / License

    • Pay once
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    Inout Webmail screenshot 1
     
12 of 14 Gmail alternatives