Chess.com

Chess.com is the default answer to 'which chess app should I install,' and the scale behind that is hard to overstate: over 250 million registered accounts mean matchmaking is instant at any rating, any hour, in any time control. For most players the platform question ends here - the community alone makes it the path of least resistance.

What keeps players on it is the breadth of the ecosystem. Play, puzzles, lessons, video courses, daily game review, clubs, tournaments, and a coach marketplace all live behind one login and sync across web and strong mobile apps. The content library has no real rival in volume, and the AI-assisted Game Review turns finished games into specific, actionable feedback. For a beginner this is the most complete single place to learn; for an intermediate player it is the most convenient place to grind and improve.

The cost is that the experience is tuned around the Diamond subscription. The free tier is genuinely usable - unlimited play and rated games - but Game Review is capped at one per day, many lessons sit behind the paywall, and free accounts see ads. Players who care most about an open, ad-free, fully free experience tend to prefer Lichess; players who want the deepest content and the largest pool accept the upsell. Both can be true at once, which is why many serious players keep an account on each.