Tutanota
Open Source
Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service.
FastMail
Commercial
FastMail is an email service offering paid email accounts for individuals and organizations.
Zoho Mail
Freemium
Zoho Mail is a email service with ample storage, POP and IMAP access, some integration with instant messaging and online office suites.
Compare ProtonMail with alternatives
Compare Tutanota and ProtonMail and decide which is most suitable for you.
Compare Zoho Mail and ProtonMail and decide which is most suitable for you.
Compare FastMail and ProtonMail and decide which is most suitable for you.