Alternatives to DarkSquares
Blindfold chess training, broken into 7 progressive levels. If that's not for you - or you want to try something different - here are apps that overlap on features and use cases.

Chess.com
Chess.com, LLC
The default home of online chess.
Free · from $4.17/mo
4.5Web · iOS · Android

Lichess
Lichess (charity)
Free, open-source chess. Forever.
Free
4.8Web · iOS · Android

Aimchess
Aimchess (Chess.com group)
AI that finds your chess weaknesses and drills them.
Free · from $7.99/mo
4.1Web · iOS · Android

CT-ART 6.0
Convekta Ltd. (ChessOK)
The classic tactics trainer, now multi-platform.
From €24.99 one-time
Web · iOS · Android

Chess King Learn
Chess King (CHESSQUEEN INC, ex-Convekta)
Huge Convekta course catalog in one app.
Free
4.8Web · iOS · Android

Noctie.ai
Noctie AB
AI opponents that play like humans do.
Free · from €14/mo
Web · iOS · Android

Shredder Chess
Stefan Meyer-Kahlen
A classic standalone chess engine for offline play.
From $7.99 one-time
iOS · Android · macOS

Chess Tempo
Chess Tempo
The serious puzzle grinder's tool.
Free · from $3.50/mo
4.7Web · iOS · Android