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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It all depends on your personal balance of risk vs convenience.
Your card details should be secure provided you follow standard security practices. So if you tire of manually inputting them all the time then go ahead.
If there ever is a vulnerability disclosed you can cancel your cards through your provider and have them re-issued. Finally, if you ever come across fraudulent purchases you can dispute them.
that is a true concern. however in this case I have a good feature provided by my bank provider, where I can create a virtual-only card, to which I send a fixed balance amount, like $100 and that is all that card have - even tho my account may be at $1000. so given this and the e2e encryption, I guess its probably safe to store - at least the virtual cards