Open Source ProtonMail Alternatives
The best open source alternative to ProtonMail is Tutanota, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to ProtonMail and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to ProtonMail are Disroot (Free, Open Source), Posteo (Paid, Open Source), CTemplar (Freemium, Open Source) and Criptext (Free, Open Source).
- 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
- Freemium • Open Source
- Online
- Android
- iPhone
- iPad
- Self-Hosted
- F-Droid
Tutanota vs ProtonMail
Tutanota is a free and open source web-mail client that focuses on privacy. There's also an Android and an iOS app. All data is stored encrypted and can not be searched, i.e. for commercial usage. It offers dead easy end-to-end encryption. 1 GB of storage is free for everyone. We want to make a secure inbox easily available for everybody worldwide.Very similar in design and philosophy to Proton. Based in Germany.Tutanota does not allow immediate access. Must wait 48 hours to use.prechallenging_despitous Cheap easy to use good clintBelsima Functions on secure browsers like Klar and Tor.Free and with best featuresNearly as good as ProtonMail. - Disroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization. View 20 alternatives to Disroot
- Free • Open Source
- Online
Disroot vs ProtonMail
lelgenio imap smtp support, open source, all freeSimple, efficient, you can use it with Tunderbird or other mail client. - 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
- Paid • Open Source
- Online
Posteo vs ProtonMail
JohnFastman Posteo could be a good Protonmail alternative. It offers email encryption in a similar way: Posteo's people, government surveillance and successful hackers won't get into your email content. It also offers a calendar feature, which protonmail users have been crying out for for years. - CTemplar offers users the world’s most secure encrypted email program. CTemplar’s security does not lie solely in its advanced encryption. CTemplar is structured and domiciled so as to best protect your data from information requests. View 24 alternatives to CTemplar
- Freemium • Open Source
- Online
- Android
- iPhone
- Android Tablet
- iPad
- F-Droid
CTemplar vs ProtonMail
They compete to be the best. - Finally, an email service that's built around your privacy. Get your @criptext. View 17 alternatives to CriptextNo screenshots yet
- Free • Open Source
- Mac
- Windows
- Linux
- Android
- iPhone
Criptext vs ProtonMail
Even thought Proton Mail is a good privacy focused email, it still holds both your emails and your keys on their servers. Regarding ownership, Criptext gives the user ownership over their keys, which reside only on the user's devices. It also uses Signal Protocol for encryption which I personally like better than just using pgp. - 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. View 74 alternatives to Kolab Now
- Paid • Open Source
- Online
- Software as a Service (SaaS)
- DAVdroid
- 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
- GPGMail is a PGP plugin for Apple Mail. It brings the functionality to sign, verify, encrypt and decrypt mails using the... View 23 alternatives to GPGMail
- Self-hosted server for the ProtonMail client. View 20 alternatives to NeutronMail
Discontinued
No longer supported
No screenshots yet- Free • Open Source
- Online
- Self-Hosted
- Fripost – the Free Email Association. View 29 alternatives to Fripost