Chess Ramp is free to use: game analysis, openings training, daily puzzles, and bot games all work without paying or creating an account.
Premium adds unlimited Stockfish game analysis, deeper engine depth, and extra training tools for players who want the full toolkit.
The free tier is not a trial — the core analyzer, the openings library, the daily puzzle, and practice games against bots stay free permanently. Premium exists for players who analyze in volume and want the engine digging deeper on every move.
Deeper engine depth matters most in quiet positions and endgames, where the best move only reveals itself several plies further down the line. If your games are being decided there, Premium is where the upgrade shows up.