ChessButler

The ultimate Chess Repertoire Building App, and it's only getting better.
Import your games from any chess website, using PGN notation or the most recent game from either Chess.com or Lichess.
Check your game versus a masters database to see where you went wrong.
Isolate the part of the game that you want to remember.
Add the Opening to a Repertoire and then study your openings like a playlist.
The app keeps track of how often you get an opening correct or incorrect and you can study only the ones that you have trouble on.
Get Premium to make use of the Repertoire Health Checker that will let you know if your Repertoire has any inconsistencies or duplicates.