Analysis that stays with you
Good analysis tools shouldn't require an account, a subscription, or someone else's server. dxc4.com runs Stockfish 16 directly in your browser via WebAssembly. No gatekeeping. Open the URL and start.
The URL is the database
Every analysis session — moves, branches, current position — is encoded directly into the URL. No accounts, no databases, no server infrastructure. When you share a link, the recipient sees exactly what you see. The entire state travels with it.
This architecture is deliberate. No servers means no server costs, which means the tool stays free. It also means your analysis works offline once the page has loaded.
What it does
Stockfish 16 runs via WebAssembly with no network latency. Evaluation is immediate. Click any engine suggestion to play it on the board.
Explore alternative lines and the original is automatically preserved as a branch. Every variation you touch is saved, never overwritten.
Import your full Chess.com game history by username. Browse by month, open any game with one click. Or paste a PGN directly.
Win probability charts track how advantage shifts move by move. 3,546 openings are recognized in real time with ECO classification.
Principles
No servers. Stockfish runs in your browser. There is no backend, no API, no infrastructure between you and the engine.
No accounts. No registration, no login, no profile. Open the link, analyze, close the tab.
No gatekeeping. The same engine used by grandmasters, available to anyone with a browser. No feature tiers, no paywalls.
No cost. No servers means no server bills. This stays free.
Who
dxc4.com is made by Field Bureau & Werkstatt, an independent design and technology practice. We make software tools that are deliberate, human, and built to last.