ProtonMail offers encrypted contacts for both web and mobile applications (https://protonmail.com/blog/encrypted-contacts-manager/). Calendar and note functionality will be released in the future.
149 votesArthur commented
Since space is so limited, I think this is a great idea.
Thank you for your suggestion. Password security is incredibly important and something we take very seriously at Proton Technologies. We will consider add a Password Manager to our product suite roadmap.Arthur commented
I'd use it.