SizeGuess
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Guess the size

The daily five

Five comparisons, the same for everyone. Resize each target, trust your eye, and see how close you can get to 500. A new set arrives at 00:00 UTC.

The world is waiting.

Preparing your size challenge…

A better eye for real-world scale

The green reference has a known size. Adjust the coral target with the slider, buttons or sideways dragging. Read the height, length or diameter labels before locking in.

How to playScoring explainedChoose a categoryCompare sizes

Get a sense of scale.

  1. Find your reference.The object on the left has a known measurement. Check the height, length or diameter label.
  2. Resize your guess.Pull the corner of the coral silhouette, use the slider, or tap − / +. The green reference stays fixed. Fit view changes only the camera.
  3. Lock it in.The teal silhouette animates to its true size; your coral guess stays visible for comparison. Earn up to 100 points per round; five rounds make 500.
Full rules & scoring

Your perspective.

Play a set to start your personal history.

Share a perspective.

Same silhouettes. Same rounds. Who has the better eye?

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Clear your progress?

This removes SizeGuess scores, saved rounds and streaks from this browser.