I made something similar [0] but based on Diceware [1] and a book you pass on to the app. It generates passphrases by using words from the book.

[0] https://github.com/pjaspers/frasier

[1] http://world.std.com/~reinhold/diceware.html

This reminds me of the RealNetworks [0] story a few weeks back.

[0] https://medium.com/launching-ux-launchpad/385ff833f9c8

Down for me.