Customizable Move-Training app?

Hello Lichess community,

I'm looking for an app with which I can make my own lines for training. One that I can quiz myself with.

I know there are plenty of apps with the purpose of teaching one predetermined mainlines, but I know of none that I can create my own lines with.

Does such an app exist?

Chessable has this.

I think you're looking for studyopenings.com

Thank you both so much! I'll use the feature on chessable, since I already use it regularly.

Chess Tempo?