ChessrChessr.io
FeaturesPricingFAQBlogRoadmap
DiscordDownload
ChessrChessr.io
8
7
6
5
4
3
2
1a
b
c
d
e
f
g
h
3,134 players · plays undetected

The chess extension
they fear.

4 engines. 8 personalities. ELO 300 to 3500.
Real-time analysis on chess.com, Lichess and Worldchess.

Download extension

Works everywhere you play

chess.comchess.com
lichess.orglichess.org
worldchess.comworldchess.com
Desktop
Android
iOS

4 engines on demand

Engines that fit your needs.

Positional control, human cover, a defined style, or raw strength — switch any time, mid-game.

3400
Positional max

Komodo Dragon 3.3

When you want to crush positionally.

Slow, calculated, GM-level positional play. Pick Komodo when you want the kind of long-plan moves that win World Championship games.

PositionalEndgame kingLong-plan
800–2600
Human-grade

Maia 3

When you want to stay invisible.

Trained on millions of human games. Plays at your target ELO with natural tempo and natural blunders. The lowest detection-risk pick for any rating.

Adaptive ELOHuman tempoNatural blunders
1200–2800
Personality-driven

Rodent IV

When you want a recognizable style.

8 personalities — aggressive sacrificer, defensive crusher, dynamic attacker, classical positional. Pick the style that matches yours and Rodent plays it consistently at any ELO.

AggressiveDefender+6 more
3500
Max strength

Stockfish 18

When you just want to win.

The strongest engine in the world. Force depth, multi-PV, tactical brilliance. Pick Stockfish when raw move quality is the only thing that matters.

Brute forceForce depthMulti-PV

Opening theory

3,700+ openings.

Select your repertoire and follow the theory arrows on the board — Chessr keeps you in book, and covers you when your opponent isn't.

Build your repertoire

Pick your lines among 3,700+ openings — Italian, Sicilian, London, King's Gambit… seeded with masters win rates.

Theory arrows, live

Your next book move is drawn on the board with the opening's name — every move, as long as you're in theory.

Covered on deviations

Opponent leaves the book? Chessr instantly shows the strongest book reply to the position actually on the board.

PremiumIncluded in Premium & Lifetime — try it with the free trial.
♜♝♛♚♝♞♜♟♟♟♟♟♟♟♞♟♟♞♟♟♟♟♟♟♟♜♞♝♛♚♝♜ITALIAN
Italian Game
1. e4 e5 2. Nf3 Nc6 — your move
3,700+
openings

Game review

Game review, without chess.com Diamond.

Same accuracy, same effective Elo, same move classifications — no Diamond membership needed.

Chessr review popup showing the same accuracy numbers as chess.com Diamond's Game Review
Same values, side-by-side
Identical engine, identical numbers
  • Accuracy % + Effective Elo per player
  • Every move classified (best, blunder, brilliant, miss…)
  • Per-phase breakdown (opening, middlegame, endgame)
  • AI explanations from all chess.com coaches
  • Free — no chess.com Diamond required

See the full review

Move-by-move analysis

Full game review on app.chessr.io with move classifications, eval graph and AI explanations
Just want the review? · Chrome Web Store

Start with 5 reviews / day, free.

Standalone Chessr Review Unlocker extension. Free forever for casual use — upgrade to unlimited if you grind.

  • Unlimited chess.com game reviews
  • Same numbers as Diamond
  • No engines, no auto-move — review only
  • Works on every finished chess.com game
Available in theChrome Web Store

Free forever · 5 reviews / day · No card required

Need more?
Unlimited reviews
€1/month
or €10 / year

Upgrade in-extension after install. Cancel anytime · 14-day money-back.

Want the full Chessr (4 engines, auto-move, anti-cheat blocked)? Chessr Premium →

Everything else

The toolkit around the engine.

Auto-move, anti-cheat blocking, game review, multi-platform — every assist a serious player wants, in one extension.

Auto-move with hotkeys

Bind Q/W/E to the top engine moves. Click. Done. Or let the auto-mover run hands-free with randomized human-like timing.

Humanized timing

Adjustable per-move delays + pre-move noise so your move tempo looks organic. Three presets + custom mode.

Anti-cheat blocked

Chessr blocks chess.com's anti-cheat scripts at the network layer. They never load, they never run, they never see anything. Thousands of players run it daily with zero hits.

On-board move arrows

Top 3 engine moves rendered as arrows directly on the chess.com board. Glanceable, color-coded by strength.

Live evaluation bar

Real-time eval that updates every move. See exactly when the position shifts — and by how much.

Game review on chess.com

Free chess.com game review for every game. Accuracy %, effective Elo, every move classified. No Diamond subscription required.

Per-engine personalities

Switch engine + personality mid-game. Play Rodent IV Aggressive in blitz, Maia 3 in rapid, Stockfish in correspondence.

Multi-platform

Chess.com. Lichess. Worldchess. Same extension. Same engines. Anywhere you play on the web.

Stream Mode

One click hides every overlay from the game page and moves your arrows & eval to a private tab — viewers see a clean board, you stay covered.

What 3,134 players are saying

From bullet hunters to FIDE titles — Chessr fits any level, any platform, any style.

Climbed from 1700 to 2200 in 5-7 days. Never banned once. One of the best chess tools I've used.
jun***
Premium user
Chessr is hands down the best tool. Super smooth and completely undetected!
RdD***
Premium user
Huge difference vs Chess Assist. I could not get banned from the anti-cheat — only from manual reporting. Life saver.
sig***
Lifetime user
It's the only tool that hasn't banned me within 2 days.
Vex***
Lifetime user
Climbed from 1700 to 2200 in 5-7 days. Never banned once. One of the best chess tools I've used.
jun***
Premium user
Chessr is hands down the best tool. Super smooth and completely undetected!
RdD***
Premium user
Huge difference vs Chess Assist. I could not get banned from the anti-cheat — only from manual reporting. Life saver.
sig***
Lifetime user
It's the only tool that hasn't banned me within 2 days.
Vex***
Lifetime user
Climbed from 1700 to 2200 in 5-7 days. Never banned once. One of the best chess tools I've used.
jun***
Premium user
Chessr is hands down the best tool. Super smooth and completely undetected!
RdD***
Premium user
Huge difference vs Chess Assist. I could not get banned from the anti-cheat — only from manual reporting. Life saver.
sig***
Lifetime user
It's the only tool that hasn't banned me within 2 days.
Vex***
Lifetime user
Climbed from 1700 to 2200 in 5-7 days. Never banned once. One of the best chess tools I've used.
jun***
Premium user
Chessr is hands down the best tool. Super smooth and completely undetected!
RdD***
Premium user
Huge difference vs Chess Assist. I could not get banned from the anti-cheat — only from manual reporting. Life saver.
sig***
Lifetime user
It's the only tool that hasn't banned me within 2 days.
Vex***
Lifetime user
Even with high win rates and consistent games, I haven't been banned or even reported. Their anti-cheat handling is really efficient.
fil***
Lifetime user
Great app, you can fine-tune all the settings. It's impossible to detect.
Meo***
Free user
Powerful and well-designed. Undetectable if configured correctly. The keyboard shortcuts and engine playing styles are amazing.
key***
Beta user
Best chess extension I've used in a while — Chessr is fast, reliable, and blends perfectly into my games.
lua***
Premium user
Even with high win rates and consistent games, I haven't been banned or even reported. Their anti-cheat handling is really efficient.
fil***
Lifetime user
Great app, you can fine-tune all the settings. It's impossible to detect.
Meo***
Free user
Powerful and well-designed. Undetectable if configured correctly. The keyboard shortcuts and engine playing styles are amazing.
key***
Beta user
Best chess extension I've used in a while — Chessr is fast, reliable, and blends perfectly into my games.
lua***
Premium user
Even with high win rates and consistent games, I haven't been banned or even reported. Their anti-cheat handling is really efficient.
fil***
Lifetime user
Great app, you can fine-tune all the settings. It's impossible to detect.
Meo***
Free user
Powerful and well-designed. Undetectable if configured correctly. The keyboard shortcuts and engine playing styles are amazing.
key***
Beta user
Best chess extension I've used in a while — Chessr is fast, reliable, and blends perfectly into my games.
lua***
Premium user
Even with high win rates and consistent games, I haven't been banned or even reported. Their anti-cheat handling is really efficient.
fil***
Lifetime user
Great app, you can fine-tune all the settings. It's impossible to detect.
Meo***
Free user
Powerful and well-designed. Undetectable if configured correctly. The keyboard shortcuts and engine playing styles are amazing.
key***
Beta user
Best chess extension I've used in a while — Chessr is fast, reliable, and blends perfectly into my games.
lua***
Premium user
First really undetected chess app I've found. This is cool.
Poo***
Beta user
Way better overall than any other extension. Easy to install, user-friendly interface, and frequent updates.
dgb***
Lifetime user
Great chess app — better than ChessAssist.
Kut***
Free user
Fast and easy to use, with move explanations and anti-detect.
nh_***
Free user
First really undetected chess app I've found. This is cool.
Poo***
Beta user
Way better overall than any other extension. Easy to install, user-friendly interface, and frequent updates.
dgb***
Lifetime user
Great chess app — better than ChessAssist.
Kut***
Free user
Fast and easy to use, with move explanations and anti-detect.
nh_***
Free user
First really undetected chess app I've found. This is cool.
Poo***
Beta user
Way better overall than any other extension. Easy to install, user-friendly interface, and frequent updates.
dgb***
Lifetime user
Great chess app — better than ChessAssist.
Kut***
Free user
Fast and easy to use, with move explanations and anti-detect.
nh_***
Free user
First really undetected chess app I've found. This is cool.
Poo***
Beta user
Way better overall than any other extension. Easy to install, user-friendly interface, and frequent updates.
dgb***
Lifetime user
Great chess app — better than ChessAssist.
Kut***
Free user
Fast and easy to use, with move explanations and anti-detect.
nh_***
Free user
Simple Pricing

Choose your plan

Start free, upgrade when ready. No hidden fees.

Free

Free

Start learning for free

  • Komodo Dragon + Stockfish 18 engines
  • Move suggestions + on-board arrows
  • ELO 400-2000
  • 2 Personalities
    Engine: Plays like an engine with minimal errors
    Aggressive: Attacks relentlessly, prefers active pieces
  • Live game analysis + evaluation bar
  • 5 game reviews / day
  • Chess.com anti-cheat blocked
  • Stream Mode (clean board on stream)
  • Chess.com, Lichess & Worldchess
Most Popular

Premium

€29.99-15%
€25.49/year

Best value - 2 months free

3-day free trial • No card requiredSign up and start your free trial instantly

Everything in Free, plus:

  • All 4 engines: Komodo Dragon, Maia 3, Rodent IV, Stockfish 18
  • Full ELO range (400-3500)
  • All 8 Personalities
    Engine: Plays like an engine with minimal errors
    Aggressive: Attacks relentlessly, prefers active pieces
    Defensive: Emphasizes king safety above all
    Active: Open positions and well-placed pieces
    Positional: Solid play and maneuvering
    Endgame: Prefers promoting pawns
    Beginner: Basic mistakes and captures
    Human: Plays like strong human players
  • Per-phase game analysis + AI explanations (all chess.com coaches)
  • Unlimited chess.com game reviews
  • Auto-move with hotkeys + humanized timing
  • Priority support
Best Deal

Lifetime

€50.71-15%
€44.11/one-time

Pay once, own forever

Everything in Premium, plus:

  • One-time payment
  • Lifetime access
  • All future updates

Ready to level up your chess?

Install the extension, pick your plan later. Free forever, upgrade anytime.

Get Started with Chessr.io
14-day money-back guarantee
Cancel anytime
No credit card required
FAQ

Questions? Answers.

Everything you need to know about Chessr — trusted by players on Chess.com, Lichess, and WorldChess.

What is Chessr and how does it work?

Chessr is a browser extension that turns chess.com, Lichess and Worldchess into your personal chess assistant. 4 engines (Komodo Dragon, Maia 3, Rodent IV, Stockfish 18) power real-time move suggestions, live evaluation, AI game reviews, and auto-move with humanized timing — all from the same Chrome extension.

Is it really undetected?

Yes — thousands of players run it daily without anti-cheat hits. The rare bans we see aren't detection — they're misuse: a fresh account climbing too fast, or a player suddenly performing way above their real level because they cranked the engine to blatant settings. Play at a realistic strength, use humanized timing, and your tempo and accuracy stay statistically organic.

What's the difference between Chessr Premium and the Review Unlocker?

Chessr Premium is the full extension — 4 engines, auto-move, anti-cheat blocking, live eval, plus game reviews. €2.99/mo or €50 lifetime. Review Unlocker is the standalone lite version on the Chrome Web Store at €1/mo — JUST chess.com game reviews (unlimited), no engine, no anti-cheat angle. Different products, different audiences. If you want to assist your games, get Premium. If you just want chess.com Diamond reviews for free, get the Unlocker.

What ELO levels are supported?

The full spectrum from 300 (beginner) to 3500 (Stockfish max). Free users get ELO 300-2000, Premium unlocks the full 300-3500 range. The engine auto-detects your rating and adapts. Maia 3 plays in the 800–2600 range with a natural human tempo for the most organic cover.

What are the 4 engines?

Komodo Dragon 3.3 (positional GM-level play), Maia 3 (trained on real human games, plays naturally at your target rating), Rodent IV with 8 personalities (Aggressive, Defender, Dynamic, Positional, Endgame, Active, Beginner, Engine), and Stockfish 18 (world #1, brute-force max strength). Switch engines mid-game.

Is there a free trial?

Yes — Premium includes a 3-day free trial. Just link your Discord account, no credit card required. Each user gets one free trial. Cancel anytime, 14-day money-back guarantee on all paid plans.

Does it work on mobile?

Yes — on Android via Kiwi Browser and on iOS via Orion (both support Chrome extensions). On desktop, any Chromium-based browser works: Chrome, Edge, Brave, Arc. Stock iOS Safari and stock Android Chrome don't support extensions, so they're not compatible.

Can I stream while using Chessr?

Yes — toggle Stream Mode and every overlay disappears from the game page. Your move arrows and eval bar move to a separate private tab that only you see, so any screen capture shows a clean board. Stream Mode is in the free tier.

Still have questions?

Ask on Discord
ChessrChessr.io

Your AI chess coach. Analyze positions, learn openings, and improve your game in real-time.

Get Started

Product

  • Features
  • Pricing
  • FAQ
  • Blog

Community

  • Discord
  • Roadmap

Legal

  • Terms of Service
  • Privacy Policy
  • Refund Policy

Chessr is a learning and analysis tool designed to help you understand chess patterns and improve your game. We are not responsible for how or when it is used. Use responsibly and in accordance with the terms of service of any platform you play on.

2026 Chessr.io. All rights reserved.

v3.4.0