You can set up your own MySQL instance with an encrypted database where you keep all passwords and joined information. Using any programming language you can either set up an app with a GUI yourself where you query your passwords or use queries directly in MySQL. I understand when you ask now for what all that hassle, but at least you have a bit more control of your data and there is not a potential company behind or a code fragment which may inform the company about any actions. BTW, you may learn some coding, so it can be fun too.