Stockfish 18 + NNUE • on-device

Paste any game.
See every mistake.

Chessight runs Stockfish 18 with NNUE neural-network evaluation natively on your phone. Drop in a chess.com URL or PGN and get a pro-level move-by-move review in seconds — no signup, no upload, no waiting.

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Free with ads Lifetime Pro available No signup
Chessight home screen showing puzzles, play modes and recent analyses

Privacy by design

Local-first. No account. No upload.

Chessight is local-first by design. No account, no game upload — your moves stay on your device. Stockfish 18 runs natively, your imports and analyses live in local storage, and we never see a single position you play.

On-device only Stockfish 18 runs natively on your phone. Zero cloud calls during analysis.
No account needed Open the app and start playing. No signup, no email, no password.
Your games stay yours Imports, profiles and analyses are stored locally — never sent to a server.

What's inside

A complete chess studio in your pocket.

Analysis. Puzzles. Practice. Theory. Every tool you reach for after a tough game — all running offline, instantly, on your device.

Stockfish 18 + NNUE

The same engine top GMs use, running natively at full strength — no cloud, no rate limits, no upload of your games.

Move-by-move review

Every move classified — Best, Great, Inaccuracy, Mistake, Blunder — with engine lines and the move you should have played.

Daily & random puzzles

A new puzzle every day plus an endless random feed. Tactics, mates, and endgame studies tuned to your level.

Play vs Bot & Free Play

Adjustable bot strength for practice games, or a board-only sandbox to walk through ideas with no engine in your face.

Theory library

Famous games, opening systems, mating patterns and endgame technique — explained, replayable and fully searchable.

Import anything

Paste a chess.com URL, drop a .pgn file, or share a game directly from another app. Chessight reads it all.

A look inside

Built for clarity. Tuned for speed.

A native Flutter app, designed move-first. No cluttered menus, no tabs hiding tools you actually use mid-analysis.

Home screen with puzzles, play modes, and recent analyses
Move analysis showing Stockfish engine principal variation lines
Detailed move review with classification and best alternative
Learn tab with famous games, openings, checkmates and endgames
Guided puzzle solving with hints and solution feedback

Why Stockfish 18 matters

Tournament-grade analysis.
Running on your phone.

Chessight ships the latest Stockfish 18 binary with NNUE neural-network evaluation built in. Multi-threaded, native ARM64, no internet round-trips. The same engine used in the World Chess Championship — fully on-device.

Try it on iOS
18
Stockfish version
NNUE
Neural eval network
4×
Threads (auto-tuned to CPU)
0
Cloud calls — fully on-device

Pricing

Free forever. Pro once. Never a subscription.

Use everything for free with light ads, or pay once for life to remove them and unlock pro tools.

Free
$0
Forever, with light ads
  • Full Stockfish 18 analysis
  • Daily and random puzzles
  • Play vs Bot & Free Play
  • Famous games & theory library
  • PGN & chess.com import
Lifetime
One-time
Unlock everything, ad-free, forever
  • Everything in Free
  • No ads
  • Maximum analysis depth
  • All future features included
  • Pay once. Never again.

Stop guessing what went wrong.

Drop in your last game and let Chessight show you, move by move, exactly where the position turned.

Download on the App Store Get it on Google Play