When comparing ProtonMail vs FairEmail, the Slant community recommends FairEmail for most people. In the question“What are the best e-mail clients for Android? ” FairEmail is ranked 1st while ProtonMail is ranked 8th.
Ranked in these QuestionsQuestion Ranking
Pro Privacy respecting
User data is protected by strict privacy laws because all servers are located in Switzerland.
Pro Built-in end-to-end encryption
Pro Open Source
Pro No personal information needed
To create an account you don't need to give any personal information, just choose username, domain, and password. Even the recovery email address is optional.
Pro Mobile apps
Apps for Android and iOS available.
Pro Overly Expensive for Desktop Support
Pro Open source
Pro Multiple account support
Multiple identities per account, notifications per account or contact.
Pro Fast and customizable
Privacy features are excellent.
Pro Identities support
Pro Two way synchronization
Pro Flat conversation threading
Pro Encryption support
Supports standard OpenPGP encryption for total privacy.
Pro Support for safety and low-bandwidth
Allows to configure maximum size of email downloaded immediately.
Pro Can show plain text of html mails
Con Still lacks some useful features
At the moment, there is no calendar feature and contact management is quite poor. They will, however, start to work on it.
Con Ties to US Investors
ProtonMail takes money from US Investors
Con No IMAP and SMTP support for basic accounts
Basic accounts are restricted to the Protonmail web client. Support for IMAP and SMTP is available with a paid subscription only, and as such with basic accounts it is not possible to send and receive email with external applications.
Con Overly Expensive for Desktop Support
Con Requires phone number for login
If you sign up over Tor or a VPN, it will require email or phone number verification. Email verification is disabled if you use an email that isn't from Google or Outlook.
Con Encryption Keys are stored server-side
The keys are generated during account creation. Using your existing keys is prohibited and ProtonMail must store and control the private keys. Encryption cannot be secure unless the user controls the private keys.