ABOUT CLARUS
A game for people who like making calls.
Clarus (playclarus.com), also known as PlayClarus, is a free forecasting game. Choose seven YES or NO predictions about sport, politics, economics, technology and world events, then see how your judgment compares with other players.
Why Clarus exists
You can have an opinion about what happens next without putting money on it. Clarus turns those calls into a points-based competition: harder correct predictions earn more points, and private leagues let friends compete together.
Built by Lewis Constable
Clarus was created by Lewis Constable, a writer and editor with a background in sports media. The aim is a straightforward game that anyone can browse and understand, whether they follow prediction markets or are trying forecasting for the first time.
Weekly play and election specials
The weekly game and the 2026 Midterms Special have separate entries, standings and private leagues. Each has published rules explaining deadlines, scoring and settlement.
Probabilities and results
Source-linked questions use market-implied probabilities from Polymarket. Probabilities are estimates, not guarantees. The resolution rules on each question explain what determines the outcome.
Clarus is independent and is not affiliated with Polymarket, any political party or an election authority. Play is free, with no money wagered.