Anki flash cards (floss) do use spaced time learning algorithms that are also easily adjustable to personal preference. Anki has native mobile/desktop, cli and web clients. The big community also provides shared decks and vast plugin ecosystem like auto text-to-speech and imagery.
I haven't seen any of these tools doing anything that anki doesn't — why not contribute to it instead?
I haven't seen any of these tools doing anything that anki doesn't — why not contribute to it instead?
https://github.com/ankitects/anki