Hi Product Hunt! I built Size It Up after noticing how difficult it is to picture the true scale of familiar things. We know what a giraffe, the Eiffel Tower, or a blue whale looks like, but we rarely see them against a consistent real-world reference. The first version was a simple resize-and-reveal experiment. It evolved into a five-round game with a shared daily challenge, endless practice, immediate measurement feedback, scoring, and leaderboards. I also spent a lot of time making the interaction feel natural across mouse, touch, pinch, slider, and keyboard controls. Size It Up is free to play in the browser, and no account is required unless you want to submit a leaderboard score. I’d love your feedback on the comparisons, scoring, and which objects you’d like to see added next.

Size It Up Game

Test your sense of scale in a five-round visual game

Test your sense of scale in a five-round visual game