About
Built by a chess player,
for chess players
Chess Lens is built by Jason Buss — a software engineer and chess enthusiast who got tired of existing tools not answering the questions that actually matter for improvement. This is a passion project born from real frustration with the gap between what chess analysis tools offer and what players actually need.
The tools that exist are great for reviewing a single game in isolation. But they don't help you answer the bigger question: what patterns of mistakes am I actually repeating? Chess Lens was built to answer that question—by analyzing your entire game history, not just one game at a time.
Interested in working together, or building something like this at scale? I'd love to hear from you.
Why Chess Lens?
Most chess improvement tools show you the engine's best move. That's useful—but it doesn't help you understand why you missed it, or whether it's part of a larger pattern in your play.
Chess Lens combines Stockfish's objective evaluation with Maia's human-level move prediction to give you a more complete picture: not just what you should have played, but how likely you were to find it—and what kinds of positions you consistently mishandle.
It's also completely offline and local-first. Your games, your analysis, your data. No subscriptions, no cloud latency, no limits on how much you can analyze.