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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For mail, Fastmail is a.much closer replacement to GMail. It's the only provider I found that supports the same "Send as" feature that GMail has. It works with standard IMAP/JMAP/SMTP. I wish the Android app was separated into separate mail and calendar apps, though.
A problem common to Proton and Fastmail is they don't feed into the system content providers for calendar and contacts, so that data is isolated from other apps. Fastmail supports CardDav and CalDav, though, so you can use ~~CALx⁵~~ DAVx⁵ to get that sync.
Neither of them integrate Maps with their calendar.
Proton famously has no real offline mode at least for calendar, and the calendar app has no search (last I tried).
Proton Pass doesn't let you specify a match algorithm so if you have separate logons for different subdomains (foo.example
com.and bar.example.com) it will show you all of them.
As others have mentioned, Proton has been spending time developing apps nobody asked for, like a crypto wallet and AI bot, instead of addressing popular user requests such as the aforementioned "send as" on mail, alternative domain matching in Pass, offline/search/maps in Calendar. They did just recently announce that they're working on a Linux Drive client, they get credit for that.
Fastmail is way way better