I might be missing something, but I think Apple’s iCloud KeyChain [1] does exactly what you’re describing (for Apple devices only ofc). [1] https://support.app

I might be missing something, but I think Apple’s iCloud KeyChain [1] does exactly what you’re describing (for Apple devices only ofc). [1] https://support.apple.com/en-us/HT204085 https://support.apple.com/en-us/HT204085