ProtonMail is described as 'Secure email with absolutely no compromises, brought to you by MIT and CERN scientists. Swiss Based' and is one of the leading apps in the Security & Privacy category. There are more than 50 alternatives to ProtonMail for a variety of platforms, including Online / Web-based, iPhone, Android, Windows and Mac. The best alternative is Tutanota, which is both free and Open Source. Other great apps like ProtonMail are Disroot (Free, Open Source), Posteo (Paid, Open Source), Mailfence (Freemium) and mailbox.org (Paid).
Tildamail is a free, decentralized, and secure email system, developed by Stanford graduates. We are an end-to-end encrypted email system that protects your privacy. Tilda is a standard for DApps backed by self-sovereign data. User data never touches our servers.
Virtru provides digital privacy technology to let you easily share information securely through all major email programs and applications. Virtru puts you in charge of how your digital information is shared.
OnionMail is an anonymous and encrypted mail server designed to run on the TOR network without losing the ability to communicate with the Internet. This ensures greater privacy to the users but also protect against eavesdropping of the NSA and others.
Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy. It provides several features, such as PGP support and diskless servers to protect users ability to communicate securely and anonymously.
Turing Email is an email client that you can use with your existing email accounts that is packed with innovative features packaged into a beautiful design. Turing is the premium email for sales professionals.
Secure (encrypted) and private (doesn't data mine or read users emails) email alternative to Gmail, Outlook, Yahoo, etc. Offers not only email support, but you store contacts, calendar events, and tasks through Exchange, IMAP, POP, etc.
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Private Relay vs ProtonMail opinions
pros, cons and recent comments
Xezeot Fully encrypted mail, contacts, calendar, tasks, IMAP/POP/Exchange, unlimited e-mail aliases. Really a great service
The Gmail you love, now lighter and just as fast. Enjoy a smart inbox that keeps your messages safe and you organized. Receive notifications when mail arrives, then read and respond both online & offline. Plus, find messages quickly with powerful search and lots more.