Chessable

Chessable is the best tool in chess for turning studied lines into recall, and for an improver that is the single hardest part of opening and tactics work. The MoveTrainer is a spaced-repetition engine built specifically for chess: it serves each variation right before it would be forgotten, handles transpositions without marking a correct move wrong, and syncs across web and mobile so ten review cards fit into a coffee break. Nothing else on the market does this as well.

The content is the other half of the value. Courses come from strong GMs (Carlsen, Giri, Shankland, Howell, Navara, Keymer and many more), and the free Short & Sweet trailers let a player confirm the method clicks before paying for a full repertoire. For openings between roughly 1500 and 2200, and for converting tactics into permanent pattern memory, it is the specialist pick over any all-in-one platform.

The honest caveats are cost, fit, and finishing rate. Individual courses run $20-100 one-time and Pro is $11.99/month or $74.99/year, so a full repertoire adds up. The interface is dense and assumes fluent notation, which makes it the wrong first app for a genuine beginner. And Chessable's real failure mode is not a feature gap but abandonment: the players who get the least from it are the ones who buy a course and never finish the drilling. Under about 1400, tactics and rated games return more per hour; at 1500+ with a specific opening to learn, this is the app that pays back.