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

Alternatives list

1. 

   

   Proton Mail

    1136 likes

   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.

   111 Proton Mail alternatives

   Cost / License

   • Freemium
   • Open Source (GPL-3.0)

   Application typeApplication types

   • WebMail Provider
   • Email Client

   Origin

   • Switzerland

   Platforms

   • Mac
   • Windows
   • Linux
   • Online
   • Android
   • iPhone
   • iPad
   • Snapcraft
   • Flathub
   • Tor
   • OpenAPK

   • Switzerland

   

   

   

   +9

   

   More about Proton Mail  

   

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

    

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   35comments

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   Proton Mail vs Gmail Comments

   Top Positive Comment by John Fastman · Dec 20, 2016

   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 · Sep 4, 2026

   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 · May 21, 2025

   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. 

   

   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 Gmail?

    

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   14comments

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   Tuta Mail vs Gmail Comments

   Top Positive Comment by justinterested · Jan 6, 2019

   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 · Jul 14, 2019

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

   Positive comment by Raposu · Sep 4, 2026

   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. 

   

   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 Gmail?

    

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   7comments

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   Posteo vs Gmail Comments

   Top Positive Comment by Raposu · Sep 10, 2026

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

   Top Negative Comment by Guest · Sep 12, 2024

   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 · Aug 26, 2026

   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
5. Ad

   

   

   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

    124 likes

   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

   • WebMail Provider

   Origin

   • Netherlands
   • EU

   Platforms

   • Online
   • F-Droid

   • Netherlands
   • EU

   

   

   More about Disroot  

   

   Good alternative?Is Disroot a good alternative to Gmail?

    

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   1comment

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   Disroot vs Gmail Comments

   Positive comment by Infinity64 · Nov 2, 2022

   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. 

   

   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 Gmail?

    

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   3comments

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   Infomaniak kMail vs Gmail Comments

   Positive comment by Guest · Oct 10, 2017

   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 · Sep 24, 2025

   I very good alternative for mail, contact & agenda

   Positive comment by ImSebi · Feb 16, 2022

   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. 

   

   Cloud Mail

    3 likes

   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

   • WebMail Provider

   Origin

   • China

   Platforms

   • Self-Hosted

   • China

   

   

   

   +1

   

   More about Cloud Mail  

   

   Good alternative?Is Cloud Mail a good alternative to Gmail?

    
10. 

    

    Forward Email

     8 likes

    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
    • Open Source (MPL-2.0)

    Application type

    • WebMail Provider

    Origin

    • United States

    Platforms

    • Self-Hosted
    • Online

    • United States

    

    More about Forward Email  

    

    Good alternative?Is Forward Email a good alternative to Gmail?

     
11. 

    

    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.

    84 Kolab Now alternatives

    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 Gmail?

     
12. 

    

    Swisscows.email

     5 likes

    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...

    Cost / License

    • Paid
    • Open Source

    Application typeApplication types

    • WebMail Provider
    • Email Client

    Origin

    • Switzerland

    Platforms

    • Online
    • iPhone
    • iPad
    • Android
    • Android Tablet

    • Switzerland

    

    

    

    +6

    

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    Good alternative?Is Swisscows.email a good alternative to Gmail?

     
13. 

    

    SwisMail

     1 like

    Secure Free EMail Service Hosted in Switzerland.

    Cost / License

    • Freemium
    • Open Source

    Application type

    • Mail Server

    Platforms

    • Online
    • Android
    • iPhone

    

    

    

    +1

    

    More about SwisMail  

    

    Good alternative?Is SwisMail a good alternative to Gmail?

     
14. 

    

    Galae

     1 like

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

    Cost / License

    • Paid
    • Open Source (GPL-3.0)

    Application type

    • WebMail Provider

    Origin

    • France
    • EU

    Platforms

    • Online
    • Software as a Service (SaaS)

    

    Good alternative?Is Galae a good alternative to Gmail?

     
15. 

    

    systemli.org

     5 likes

    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.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Online

    

    Good alternative?Is systemli.org a good alternative to Gmail?