Chess CPI
Core Performance Index

Serious analytics for
chess improvers

We show you how you actually play. Deep insights from your games across Chess.com and Lichess.

We review every signup. Expect a short email when you're in.

See Your Patterns

Discover how you really play across openings, middlegame, and endgames

Find Blind Spots

Identify tactical weaknesses and missed opportunities in your games

Track Progress

Monitor your improvement with engine-backed accuracy metrics

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Lichess
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Chess.com