Open Source Gmail Alternatives for Android

There are many alternatives to Gmail for Android if you are looking for a replacement. The best open source Android alternative is Proton Mail. If that doesn't suit you, our users have ranked more than 50 alternatives to Gmail and seven of them are open source and available for Android so hopefully you can find a suitable replacement. Other interesting open source Android alternatives to Gmail are Tuta Mail, Infomaniak kMail, Swisscows.email and SwisMail.

filter to find the best alternatives

Gmail alternatives are mainly Email Clients, but if you're looking for WebMail Providers or Calendar Apps you can filter on that. Other popular filters include Open Source, Free, Android + Free, Android + Open Source, EU, Android 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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Gmail alternatives page was last updated May 2, 2026

Proton Mail
1083 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.
103 Proton Mail alternatives
Cost / License
Freemium
Open Source (GPL-3.0)
Application types
WebMail Provider
Email Client
Origin
Switzerland
Platforms
Mac
Windows
Linux
Online
Android
iPhone
iPad
Snapcraft
Flathub
Tor
+9
Is Proton Mail a good alternative to Gmail?

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34comments
Proton Mail vs Gmail Comments

Top Positive Comment
John Fastman
Dec 20, 2016
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 commentMay 21, 2025
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
CommentMar 3, 2025
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

3 of 34 comments
Proton Mail is Freemium and Open SourceGmail is Free and Proprietary
Proton Mail is Privacy focusedGmail is not according to our users
Tuta Mail
561 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.
108 Tuta Mail alternatives
Cost / License
Freemium
Open Source (GPL-3.0)
Application types
WebMail Provider
Email Client
Origin
Germany
EU
Platforms
Mac
Windows
Linux
Online
Android
iPhone
iPad
Flathub
F-Droid
Android Tablet
Thunderbird
+1
Is Tuta Mail a good alternative to Gmail?

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13comments
Tuta Mail vs Gmail Comments

Top Positive Comment
justinterested
Jan 6, 2019
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
Guest
Jul 14, 2019
25
Does not support POP/IMAP, you will not be able to use it with Thunderbird or another email client.
Review by a new / low-activity user.
alttosgt
Positive commentApr 1, 2025
0
Tuta Mail is NOT self hosted despite claim on AlternativeTo
3 of 13 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
Infomaniak kMail
47 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.
49 Infomaniak kMail alternatives
Cost / License
Freemium
Open Source (GPL-3.0)
Application types
WebMail Provider
Email Client
Origin
Switzerland
Platforms
Online
Android
iPhone
Android Tablet
iPad
F-Droid
+8
Is Infomaniak kMail a good alternative to Gmail?

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3comments
Infomaniak kMail vs Gmail Comments

Guest
Positive commentOct 10, 2017
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.
ImSebi
Positive commentFeb 16, 2022
0
Much better than Gmail. And now you don't need a domain anymore, it's free for everyone.
hb9vaf
Positive commentSep 24, 2025
0
I very good alternative for mail, contact & agenda
Review by a new / low-activity user.
Infomaniak kMail is Freemium and Open SourceGmail is Free and Proprietary
Infomaniak kMail is Privacy focusedGmail is not according to our users
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
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 types
WebMail Provider
Email Client
Origin
Switzerland
Platforms
Online
iPhone
iPad
Android
Android Tablet
+6
Is Swisscows.email a good alternative to Gmail?
SwisMail
1 like
Secure Free EMail Service Hosted in Switzerland.
Cost / License
Freemium
Open Source
Platforms
Online
Android
iPhone
+1
Is SwisMail a good alternative to Gmail?
Keychat
2 likes

Senders send messages stamped with Bitcoin ecash to Nostr relays. The Nostr relays collect the Bitcoin ecash, then deliver messages to receivers.

Cost / License
Free
Open Source (AGPL-3.0)
Application types
Instant Messenger
Video Calling
Platforms
Android
Is Keychat a good alternative to Gmail?
Criptext
10 likes
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.
Cost / License
Free Personal
Open Source
Application type
Email Client
Origin
United States
Alerts
Discontinued
Platforms
Mac
Windows
Linux
Android
iPhone
+1
Is Criptext a good alternative to Gmail?

7 of 7 Gmail alternatives

Open Source Gmail Alternatives for Android

Alternatives list

Proton Mail

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Proton Mail vs Gmail Comments

Tuta Mail

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Tuta Mail vs Gmail Comments

Infomaniak kMail

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Infomaniak kMail vs Gmail Comments

Swisscows.email

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SwisMail

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Keychat

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Criptext

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