It was rough kivy app, which I am not committed to publishing, currently. You can easily write your own, once you define a system for memorizing the characters

It was rough kivy app, which I am not committed to publishing, currently. You can easily write your own, once you define a system for memorizing the characters. The idea is to use animal names for upper case characters, inanimate objects for lower case, and special mnemonics for other characters you want to use. A doormat for underscore, a bomb for exclamation mark etc. Then it's just a dictionary lookup. The tricky thing is to make the users understand how the method of loci works (Minecraft is a good medium for this), and that you need to repeat the password at least once per day until it is completely memorized.