Local Stockfish analysis
Stockfish runs in your browser with principal variations, depth control, and fast iteration - no install and no server queue on the free tier.
Product
Chess Study - Chessyi
Browser chess study software with local Stockfish analysis, 12+ position heatmaps, piece-level attack and defense overlays, opening practice, 1.9 million master games, and adjustable engine sparring - free in the browser with no download, built for players who want to understand positions deeply rather than only see engine scores.
Chessyi is professional chess study software that runs entirely in your browser. It combines local Stockfish analysis, twelve or more position heatmap overlays, piece-level attack and defense visualization, opening practice, a library of 1.9 million master games, and adjustable engine sparring on one board - without installing a desktop engine or waiting in a server queue.
Where Chess.com and Lichess excel at online play, Chessyi is built for deep study: import PGN from any source, explore why a position works, rehearse openings against policy, and compare your lines to master practice. Stockfish loads in the browser for speed and privacy, so analysis stays on your device rather than a shared cloud queue.
Free accounts save games and sync across devices. Core analysis, opening drills, the master game library, and engine sparring are available without paid tiers, making Chessyi a practical analysis desk alongside the site where you keep your online rating.
Seventeen built-in tools cover visualization, notation, arrows, game import, library search, and training modes serious learners expect from dedicated chess software - packaged for learners, club players, coaches, and enthusiasts who study more than they blitz.
Product deep dives
Study depth Chess.com and Lichess rarely bundle free
Chessyi keeps heatmaps, local Stockfish, opening practice, and a 1.9M game library on one board so you stop switching apps to answer the same question: what is really happening in this position, and how do strong players handle it?
See Chessyi in the modes you will study with
Real screens from the analysis board, heatmap overlays, opening trainer, engine panel, and master game library at chessyi.com.
Analysis board overview
Stockfish, notation, and study tools on one responsive board - the home screen for daily review and game import.
Heatmap visualization
Twelve or more overlay layers reveal control, tension, and piece activity so you see why a position feels sharp before you memorize engine lines.
Opening practice
Drill repertoires against policy, track accuracy, and connect practice lines to the bundled opening guides and master references.
Local Stockfish engine
Depth, lines, and evaluation update on your device without queueing behind other users - built for uninterrupted analysis sessions.
Master game library
Search and replay from 1.9 million master games to compare your structures, plans, and move choices with titled practice.
Attack and defense overlays
Piece-level attack and defense views complement heatmaps when you teach, annotate, or explain tactical motifs to students.
Built for serious chess learners
Browser-native study tools that prioritize visualization, local engine depth, and master references over matchmaking.
12+ heatmap layers
Unique visualization overlays show control, tension, king safety, and piece activity so you learn structure, not only centipawn scores.
Opening practice
Drill repertoires, track accuracy against policy, and connect practice to opening guides and master statistics from the bundled library.
1.9M master games
Search, filter, and replay master games to compare your choices with titled practice without maintaining a separate database subscription.
PGN import
Paste or upload standard PGN from Chess.com, Lichess, tournaments, or coaches - one desk for every game you need to review.
Engine sparring
Play against adjustable Stockfish strength to test plans, punish blunders, and rehearse endings with an opponent that never tires.
Cloud save (free account)
Create a free account to save games, sync study lines, and return to the same analysis across laptops and tablets.
17 study tools
Arrows, notation modes, library search, visualization toggles, and training utilities ship together rather than as scattered premium add-ons.
What players gain from Chessyi
Chessyi helps club players, coaches, and enthusiasts build intuition faster by making position understanding visible - then backing it with local engine depth and master references on the same board.
- Fewer app switches between analysis, opening prep, and game database search.
- Heatmaps and piece overlays that explain plans, not only list engine moves.
- Private local Stockfish runs without waiting behind other users on shared servers.
- A free toolkit that complements Chess.com or Lichess rather than replacing where you play.
- PGN workflows that respect how tournaments, coaches, and students already share games.
Why chess learners choose a dedicated study desk
Online playing sites optimize for matchmaking, ratings, and social features. Serious improvement still depends on structured review: understanding pawn structures, comparing candidate moves to master games, and rehearsing openings until they survive clock pressure. Chessyi targets that study loop with visualization-first tooling rather than treating analysis as a secondary panel behind another rapid game.
Heatmaps and piece-level overlays are rare in free analysis tiers elsewhere. Chessyi bundles more than twelve visualization layers so learners see control, tension, and king safety before they memorize engine lines. That visual literacy transfers to over-the-board play faster than scrolling principal variations alone.
Local Stockfish matters for privacy and responsiveness. Analysis executes on your device instead of a shared cloud queue, which keeps review sessions uninterrupted during long training blocks. Coaches and students can work through sensitive preparation without uploading every position to a third-party server.
The 1.9 million game library anchors opening and middlegame study. Filter master practice, compare structures, and jump from your PGN import to historical references without maintaining a separate database subscription. Many players keep their online rating on Chess.com or Lichess while using Chessyi as the analysis desk for every imported game.
Chessyi: common questions
Straight answers for players, coaches, and parents evaluating chess study software.
Yes. Free accounts include core analysis, opening drills, the master game library, engine sparring, and cloud save. Create an account to sync games across devices; there is no download and no credit card required to start.
No. Stockfish loads automatically in your browser and runs locally on your device for speed and privacy.
Chess.com and Lichess focus on online play. Chessyi focuses on deep study: heatmaps, local Stockfish, opening practice, and 1.9M master games together on one board without switching apps.
Yes. Paste or upload standard PGN from Chess.com, Lichess, tournaments, or any PGN source.
Open chessyi.com in a modern browser, create a free account, and start with the analysis board or opening practice modules.
Start studying with Chessyi in minutes
No install, no engine setup, and no separate database subscription - just import a game and explore.
Open chessyi.com
Create a free account or explore the board anonymously, then load Stockfish and visualization tools in one click.
Import your games
Paste PGN from your last online session, tournament, or lesson and jump straight to heatmaps and engine lines.
Practice openings
Drill your repertoire against policy, track accuracy, and compare lines to master statistics from the bundled library.
Spar and review
Test plans against adjustable engine strength, save key positions to your account, and return across devices without losing context.
Related Neojn capabilities
Pair Chessyi with delivery and platform services when you scale beyond individual study.
Web app development
High-performance browser applications with offline-tolerant patterns, auth, and analytics when you extend study tooling.
Web app developmentMobile app development
Native or cross-platform clients when your audience expects app-store distribution and push notifications.
Mobile developmentAI solutions
Governed copilots and evaluation harnesses when you add coaching assistants or personalized training plans.
AI solutionsCloud and DevOps
Resilient hosting and observability for consumer SaaS products with global player traffic.
Cloud and DevOps
Try Chessyi on your last game
Open chessyi.com, import a PGN from your recent play, and walk heatmaps, local Stockfish, and the master library on the same board. Neojn can also discuss institutional licensing, integrations, or co-branded study programs when you contact us.