@eveyone Do you know another app for recall mode?

is there another app that have speciality that can do the same thing for recall mode like margin note on doc screen?
ı mean “one” click to open answer highlight “RIGHT ON PDF”
NOT something like flashcard based answers ‘anki’ , quizlet or smt else…

related to this post:

You can try anki master.

Cool example thank you
İs that free? Or limited for part ?