# Chessr

> Chessr is the #1 chess browser extension for real-time analysis, move suggestions, and opening mastery. It works directly on Chess.com, Lichess, and WorldChess — no setup required.

## What is Chessr

Chessr is a browser extension that acts as your personal chess coach. It connects to powerful server-side engines to analyze positions in real-time, suggest moves adapted to your skill level, and help you understand why certain moves are strong.

Chessr uses two best-in-class engines running on its servers — **Komodo** for human-like move suggestions (the leading engine for humanized play), and **Stockfish** for deep game analysis. All computation happens server-side, meaning zero performance impact on the user's device.

Unlike traditional post-game analysis tools, Chessr provides live feedback while you play. It overlays evaluation bars, move arrows, and opening deviation alerts directly on your chess board.

## Key Features

- **Dual-Engine Architecture**: Komodo for human-like suggestions + Stockfish for deep analysis — all running server-side with zero load on your device
- **Real-Time Analysis**: Live evaluation bar and move arrows drawn on the board as you play
- **12,000+ Openings**: Automatic opening detection with deviation alerts and smart suggestions when opponents deviate from theory
- **8 Playing Personalities**: Engine, Aggressive, Defensive, Active, Positional, Endgame, Beginner, and Human — each changes how the engine plays
- **ELO Range 300-3500**: From beginner to master level, the engine auto-detects your rating and adapts suggestions
- **Multi-Platform**: Works on Chess.com, Lichess, and WorldChess
- **Armageddon Mode**: Premium feature for high-stakes practice under pressure

## Why Komodo + Stockfish

Chessr is the only chess extension that combines two engines for different purposes:

- **Komodo** is widely regarded as the best engine for producing human-like moves. Rather than always finding the absolute best computer move, Komodo suggests moves that a strong human player would actually play — making it ideal for learning and improving naturally.
- **Stockfish** is the strongest chess engine in the world, used for deep position analysis and game review where maximum accuracy matters.

Both engines run on Chessr's servers, so the extension stays lightweight and fast regardless of the user's hardware.

## Pricing

- **Free**: Move suggestions, live evaluation bar, 2 personalities, 8 openings, ELO up to 2000
- **Premium**: €2.50/month (billed yearly at €24.99/year) — all 8 personalities, full ELO range 300-3500, 12,000+ openings with deviation detection, Armageddon mode
- **Lifetime**: €50 one-time payment — all premium features forever
- 3-day free trial on Premium, no credit card required
- 14-day money-back guarantee on all paid plans

## FAQ

### What is Chessr and how does it work?
Chessr is a browser extension that analyzes chess positions in real-time using server-side engines (Komodo for human-like suggestions, Stockfish for deep analysis). It suggests moves adapted to your skill level and works directly on Chess.com, Lichess, and WorldChess.

### What platforms are supported?
Chess.com, Lichess, and WorldChess, with more platforms coming soon. Available as a Chrome browser extension on desktop and mobile-compatible browsers.

### What ELO levels does Chessr support?
Free users: ELO 300-2000. Premium users: full 300-3500 range. The engine auto-detects your rating and adapts suggestions.

### What are the 8 Personalities?
Engine (minimal errors), Aggressive (attacks and Queen play), Defensive (king safety), Active (open positions), Positional (solid maneuvering), Endgame (pawn promotion focus), Beginner (basic play), Human (plays like strong humans).

### Is Chessr free?
Yes. The free tier includes move suggestions, live evaluation bar, 2 personalities, 8 openings, and ELO up to 2000. Premium unlocks all features.

### Does Chessr include an opening repertoire?
Premium includes 12,000+ openings with real-time deviation detection. When your opponent deviates from known theory, Chessr instantly detects it and suggests the best response.

## Blog — Detailed Guides

For in-depth chess improvement content, see our blog:

- [Best Chess Analysis Software in 2026: Complete Guide](https://chessr.io/blog/best-chess-analysis-software-2026): Compare desktop engines, online platforms, and browser extensions for chess analysis.
- [How to Improve Your Chess Rating Fast: 7 Proven Strategies](https://chessr.io/blog/how-to-improve-chess-rating-fast): Opening preparation, real-time analysis, endgame mastery, and more.
- [Live Chess Analysis on Chess.com & Lichess: How It Works](https://chessr.io/blog/live-chess-analysis-chess-com-lichess): How server-side Komodo and Stockfish analysis works through your browser.
- [Building Your Chess Opening Repertoire: A Beginner's Guide](https://chessr.io/blog/chess-opening-repertoire-guide-beginners): Best openings for White and Black, study methods, and deviation detection.
- [Understanding Chess Playing Styles: From Aggressive to Positional](https://chessr.io/blog/chess-personalities-playing-styles): Explore the 8 playing personalities and find your style.
- [Chessr vs Lichess: Honest Comparison 2026](https://chessr.io/blog/chessr-vs-lichess-comparison): Honest comparison — what each tool does best and how they work together.
- [Chessr vs Chess.com: Honest Comparison 2026](https://chessr.io/blog/chessr-vs-chess-com-comparison): Chess.com is the world's largest platform. Chessr adds real-time coaching on top of it.
- [Chessr vs ChessBase: Modern Cloud Coaching vs Desktop Software](https://chessr.io/blog/chessr-vs-chessbase-comparison): Cloud-native coaching vs professional desktop software — cost, features, and who each is for.
- [Chess Training Plan: From 300 to 1000 ELO in 90 Days](https://chessr.io/blog/chess-beginner-training-plan-300-1000): Structured week-by-week plan for beginners — blunder elimination, tactics, opening principles, endgames.

## Links

- Homepage: https://chessr.io
- Download: https://download.chessr.io
- Blog: https://chessr.io/blog
- Discord Community: https://discord.gg/72j4dUadTu
- Roadmap: https://roadmap.chessr.io