A sunny wooden detective study with a big magnifying glass, a desk of blank index cards and two curious tweens examining clues together

BiasForge

Your brain plays tricks. Run the experiments and catch them.

  • Guess after a random number
  • Same plan, two ways to say it
  • Pick the likelier story
Run the experiments →

How it works

  1. Run the experiment. A short, classic judgment test — you predict or you choose.
  2. Bet how sure you are. On the guessing ones, say "pretty sure" or "just a hunch" — honestly.
  3. See the trap. The reveal names the bias, so you carry the word away.
  4. Check the science-meter. How sure are scientists — solid, still arguing, or didn't hold up?

Whim (your fast side) falls for each trap; Muse (your slow side) catches it. Then estimate first in NumberSense and reason from evidence in InferForge.

No timer, no streak, no score to chase. Your best run is just for you and stays on this device.

What next? Pick a door

Chosen from what this app is about. What you open is remembered on this device only.