Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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I migrated away from proton for mail and calendar about 4 months ago. The services are fine, they do what they say, but the trade offs for “e2ee” email are large with a dubious benefit when it works and no benefit in 99% of cases because the vast majority of people don’t use Proton so your Mail is not encrypted anyways. I still use Pass, VPN, and SimpleLogin. They, IMO, are the best services Proton offers (though I may move passwords back to bitwarden, still deciding).
Overall it’s worth considering what secure email means to you, what your individual threat landscape looks like, and then comparing what Proton offers to your needs. Personally I migrated to Fastmail and have been pleased so far. It won’t be right for everyone, and for some the security offered by Proton may be valuable, but know there are a ton of asterisks to that security.