App for tactics flashcards

Does anyone know of an app specifically for doing a set of tactics? I currently have physical flashcards but would love to be able to put those positions in an app and do them on my phone instead. Think what Neal Bruce does, but I want to do it in an app.

@AngryNaartjie chesspecker.com/

I really like the site you gave me and I'm sure I will use it at some point. However, I was hoping for something where I can enter my own selection tactic puzzles.