Spaced repetition is a beast! I know it from my experience w/o software. I have some experience with Anki which is one of default apps on one of Linux distribs,

Spaced repetition is a beast! I know it from my experience w/o software. I have some experience with Anki which is one of default apps on one of Linux distribs, but it did not worked for me because I do not start it daily :) and to be honest I do not know what info to load and to not load in Anki. For me paper seems to be more handy because it is simpler to write in it something, to read several times what has been written and to abandon what has been learned or obsoleted.