Everything you need to improve.
CheckItApp packs a serious analysis engine and a friendly AI coach into a single browser tab.
Stockfish 16 NNUE
Full-strength neural-network engine, running client-side via WebAssembly. Multi-PV, adjustable depth, and centipawn evaluations for every move.
AI Coach Commentary
Move-by-move explanations that translate raw evaluations into ideas, plans, and lessons — like a coach whispering in your ear.
Chess.com & Lichess Import
Drop a game URL or paste PGN. Full game trees, move numbers, and clocks are preserved.
Best-Line Suggestions
See what the engine would have played and why. Explore variations without losing your place.
Mistake & Blunder Detection
Instantly find the moments that decided the game. Focus your review where it matters.
Runs Anywhere
Desktop, tablet, phone — the analyzer adapts to any screen. All you need is a modern browser.