A.C.A.SV2
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Chess Assistance

A.C.A.S

Open source & free, for you~💖

A mockup image of the A.C.A.S software.

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A.C.A.S (Advanced Chess Assistance System) is an open-source chess assistant (not a chess cheat), designed to help you make better moves using a chess engine. Just install the userscript, open the A.C.A.S GUI, and you're ready to go, no downloads necessary!

  • Completely free and open source! (Licensed with GPLv3 💖)
  • Lots of built-in WASM engines: Stockfish, Lc0, Maia and more...
  • External engine calculation server to run any engine (Beta)
  • Supports the most popular chess game sites (e.g. chess.com, lichess.org)
  • Supports multiple move suggestions, move arrow markings, chess variants & fonts
  • Get move feedback and board state analysis directly on your board
  • Translated to 30+ languages
▶️ Open A.C.A.S ⬇️ Install (GreasyFork) ⬇️ Download (Direct) 💬 Discuss With Community

Please be advised that the use of A.C.A.S may violate the rules and lead to disqualification or banning from tournaments and online platforms. The developers of A.C.A.S and related systems will NOT be held accountable for any consequences resulting from its use. We strongly advise to use A.C.A.S only in a controlled environment ethically.

Beyond Move Suggestions.

A.C.A.S helps you get better at chess your own way. You've got lots of tools to work with, and you can choose how much help you want, from full guidance to barely any at all. ( '◡' )

A.C.A.S can render stuff right on the chessboard.
Settings for changing the engine and such. A.C.A.S offers great customization.

Customize it.

Your own chess control center! Change chess engines, adjust the interface to your liking, and enable dozens of features the way that makes sense for how you play and study. (｡•̀ᴗ-)✧

Okay, so what's the deal?

NO payments (meaning it's 100% free to use) and NO complex software installations. Runs locally on your browser and is fully open source. Something you can trust to be by your side when you need it. That's A.C.A.S, baby! Works on puzzles, bullet, and many chess variants. A.C.A.S is light and fast! Some could even call it stable, but we'll let you decide that one. Remember, no guarantees! The engineering that went into creating A.C.A.S is not NASA level, but hey, it works.

Just install it, keep the window open, and you'll start learning as you play. Works on basically anything with a modern browser, even your phone. Everything runs locally, no cloud stuff. A.C.A.S is amaaazzinnggg!

Check it out
A.C.A.S full showcase

Ready to begin? Let's get it!