Thanks! I definitely will add more examples to the landing page, currently I'm working hard on the decks: pathlib in depth, a tour of the stdlib and Norvig's tricks (a collection of tricks from the Pytydes of Peter Norvig).

I believe the hardest part of using spaced repetition to learn programming is creating good decks, it's a ton of work.

About open sourcing the web app, I might do it. It's a Django app, and I've published some videos while coding it (https://www.youtube.com/channel/UCyWUj9r0soytotuuh2JnPrw), so it's no secret.