QChess

QChess is a free, non-commercial chess training website packed with tools that most paid platforms don't even offer. Built by a solo developer as a passion project, it quietly delivers a surprisingly deep feature set for players who want to improve their game without spending a dollar.

The platform includes a searchable database of roughly 4 million over-the-board games from 2010 to 2025, an opening trainer that mimics real GM move frequencies, blindfold drills, a "Guess the Move" mode, eval training, and a pattern-based engine called Grimmer AI rated between 2100 and 2400. There are also tools for pawn structure search, time management analysis, and auto-generated winrate-based repertoires.

One of the more unique features is Opening Models, which lets you look up a position and see which grandmasters have the most experience and highest winrate from that exact spot. Repertoire Flow autoplays uploaded PGN lines so you can study your prep visually. And Chess960 training is baked in for players who want to sharpen their understanding of uncharted opening territory.

QChess is completely free, runs in the browser, and has no premium tier. It is built for serious improvers who want practical tools without the noise. If you have never heard of it, you are not alone, but it is worth a look.