# Chessyi

> Browser chess study software with local Stockfish, 12+ position heatmaps, piece-level overlays, opening practice, and 1.9 million master games. A Neojn product. Site: https://www.chessyi.com

Chessyi is a study desk, not a matchmaking clone. Use it beside Chess.com or Lichess: import PGNs, run on-device Stockfish, toggle live heatmaps, drill openings, and browse a bundled master library on one board.

Pricing (USD): 7-day Pro trial (no credit card) → Plus $6.99/mo or $59/yr → Pro $12.99/mo or $99/yr. Cancel anytime.

For the complete agent-readable brief in one file, fetch [llms-full.txt](https://www.chessyi.com/llms-full.txt).

## Product

- [Home](https://www.chessyi.com/): Landing page and product overview
- [Full LLM brief](https://www.chessyi.com/llms-full.txt): Detailed product, pricing, heatmaps, comparisons, and FAQs in one markdown file
- [Product overview (MD)](https://www.chessyi.com/llm/product.md): What Chessyi is, who it is for, and how it fits a study workflow
- [Visualization](https://www.chessyi.com/visualization): Flagship heatmap / visualization pitch
- [Features hub](https://www.chessyi.com/features): All product capabilities
- [Features (MD)](https://www.chessyi.com/llm/features.md): Feature catalog with descriptions and URLs
- [Pricing](https://www.chessyi.com/pricing): Plans and trial
- [Pricing (MD)](https://www.chessyi.com/pricing.md): Structured pricing for AI agents
- [For players](https://www.chessyi.com/for-players): Audience page
- [About](https://www.chessyi.com/about): Company and product story
- [FAQ](https://www.chessyi.com/faq): Common questions
- [FAQ (MD)](https://www.chessyi.com/llm/faq.md): FAQ answers in plain markdown
- [Contact](https://www.chessyi.com/contact): Support and contact

## Heatmaps & analysis

- [Heatmap analysis](https://www.chessyi.com/features/heatmap-analysis): 11 board overlays (attacks, defense, control, mobility, safety, danger, and more)
- [Heatmaps (MD)](https://www.chessyi.com/llm/heatmaps.md): Full overlay catalog with colour guides
- [Stockfish analysis](https://www.chessyi.com/features/stockfish-analysis): Local WASM Stockfish, eval bar, multi-PV
- [Piece analysis](https://www.chessyi.com/features/piece-analysis): Per-piece attack and defense markers
- [Position analysis](https://www.chessyi.com/features/position-analysis): Static positional metrics
- [PGN analyzer](https://www.chessyi.com/features/pgn-analyzer): Import Chess.com / Lichess / tournament PGNs
- [Browser privacy](https://www.chessyi.com/features/browser-privacy): On-device engine; prep stays local unless you save

## Study & training

- [Game library](https://www.chessyi.com/features/game-library): ~1.9M master games, 308 collections
- [Opening practice](https://www.chessyi.com/features/opening-practice): 70+ named lines with move validation
- [Repertoire builder](https://www.chessyi.com/features/repertoire-builder): Repertoire-style prep workflow
- [Play vs computer](https://www.chessyi.com/features/play-vs-computer): ~1200–2200 ELO sparring
- [Two-player mode](https://www.chessyi.com/features/two-player-mode): Local play on one device
- [Chess clock](https://www.chessyi.com/features/chess-clock): Time controls
- [Cloud saves](https://www.chessyi.com/features/cloud-saves): Sync games across devices
- [Famous games](https://www.chessyi.com/features/famous-games): Classical classics collection
- [Openings hub](https://www.chessyi.com/openings): Opening SEO / study pages
- [Players hub](https://www.chessyi.com/players): Grandmaster game databases

## Comparisons

- [Compare hub](https://www.chessyi.com/compare): Chessyi vs other chess tools
- [Comparisons (MD)](https://www.chessyi.com/llm/comparisons.md): Side-by-side vs Chess.com, Lichess, ChessBase
- [Chessyi vs Chess.com](https://www.chessyi.com/compare/chessyi-vs-chess-com): Play on Chess.com; study deeper on Chessyi
- [Chessyi vs Lichess](https://www.chessyi.com/compare/chessyi-vs-lichess): Free Lichess analysis vs Chessyi visualization depth
- [Chessyi vs ChessBase](https://www.chessyi.com/compare/chessyi-vs-chessbase): Desktop DB power vs browser visualization

## Guides

- [Learn hub](https://www.chessyi.com/learn): How-to guides
- [Guides (MD)](https://www.chessyi.com/llm/guides.md): Guide summaries and links
- [How to read chess heatmaps](https://www.chessyi.com/learn/how-to-read-chess-heatmaps): Control, tension, mobility, king safety
- [Analyze a Chess.com PGN](https://www.chessyi.com/learn/analyze-chess-com-pgn): Export → import → heatmaps + Stockfish
- [Analyze a Lichess PGN](https://www.chessyi.com/learn/analyze-lichess-pgn): Lichess → Chessyi study workflow
- [Best ways to visualize chess positions](https://www.chessyi.com/learn/best-ways-to-visualize-chess-positions): Visualization approaches (2026)
- [Opening practice with Stockfish & heatmaps](https://www.chessyi.com/learn/opening-practice-with-stockfish): Drill lines with engine + overlays

## Company

- [Neojn · Chessyi](https://www.neojn.com/en/products/chessyi): Parent product page
- [Privacy](https://www.chessyi.com/privacy): Privacy policy
- [Terms](https://www.chessyi.com/terms): Terms of use

## Optional

- [Sitemap](https://www.chessyi.com/sitemap.xml): Full indexable URL list
- [robots.txt](https://www.chessyi.com/robots.txt): Crawl rules (marketing pages allowed; `/app`, `/api`, auth disallowed)
- [Themes & customization](https://www.chessyi.com/features/themes-customization): Board themes and piece sets
- [Focus mode](https://www.chessyi.com/features/focus-mode): Distraction-free study
- [Mobile analysis](https://www.chessyi.com/features/mobile-chess-analysis): Responsive web study on phones