[hngiszmo]

The biggest list of learning apps, many of which do support SRS is http://www.flashcardapps.info/

It's iOS only but my point is to show how there is a huge variety even for iOS users.

I did my own free SRS flashcards app and focus much on cooperative content creation: https://fluxcards.de/

My suggestion is to try it out if you never did as it is truly amazing. It can't replace a teacher or actually using what you are trying to learn but it can make sure 100% that you learn faster and never forget facts that you want to make sure you know. Try Anki or any other other SRS app if you don't want to fall for my bold self-advertisement but try it out. It's worth it and should be known by all.