The board,
and everything around it.
No subscription. No locked board. These tools are part of the platform and stay free — analysis credits are only used when you run the engine.
Available now
24 toolsAnalysis board
Stockfish 19, multi-PV, evaluation graph and full-game review.
Position editor
Set up any legal position, then send it straight to analysis.
Opening explorer
Walk your own games move by move and see what you play next.
Repertoire builder
Store lines for White and Black and drill them from your library.
Puzzle trainer
15,000 curated tactics, rated and themed for your level.
Puzzle Rush
A fast, escalating set with a clock. No account required to try.
Endgame drills
Practise the positions that decide real games.
Game library
Upload, import, search, annotate and export your games.
Studies
Build shareable position collections with notes and PGN export.
Chess clock
Two-sided clock with presets, increment and keyboard control.
Board editor
Build any legal position and copy the FEN.
FEN inspector
Validate a FEN and see what every field means.
PGN viewer
Paste a game and step through it with the arrow keys.
Elo calculator
Expected score and rating change for any result.
Tiebreak calculator
Buchholz and Sonneborn-Berger from your results.
Material counter
Count material and see who is ahead.
Time-control converter
Turn 10+5 into real minutes and a category.
Square-colour trainer
A 60-second light-or-dark board-vision drill.
Coordinate trainer
Find the named square against the clock.
Opening-name quiz
Ten lines, four names, one board.
SAN trainer
Read highlighted moves and pick the notation.
Blindfold trainer
Memorise a position, then answer from memory.
Random position
A legal position for calculation practice.
Feature Atlas
Find any tool or feature across the 1,000-item roadmap.
Some analysis tools use credits when the engine runs. Playing, puzzles, studies, clubs, tournaments, messages and every tool on this page are free.