Best chess apps for endgame mastery
The phase most players neglect. You need a structured trainer with theoretical positions plus practical drills.

Chessable
Chessable (Chess.com)
MoveTrainer + spaced repetition for openings and tactics.

Chess King Learn
Chess King (CHESSQUEEN INC, ex-Convekta)
Huge Convekta course catalog in one app.

Chess Tempo
Chess Tempo
The serious puzzle grinder's tool.

ChessEndings
ChessEndings
Play endgames out against an opponent that never gives up.

Listudy
Arne Vogel
Free open-source spaced repetition for openings.

Lichess
Lichess (charity)
Free, open-source chess. Forever.

Chess.com
Chess.com, LLC
The default home of online chess.

Aimchess
Aimchess (Chess.com group)
AI that finds your chess weaknesses and drills them.

Arena Chess GUI
Martin Blume
Veteran free GUI for running 250+ chess engines.

BetterBullet
Nik Agarwal
Bullet pacing analyzer: your 1+0 clock use vs. rating-band benchmarks.