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>log in to commentI built SizeItUp to give people a quick, daily way to test their sense of scale by guessing real‑world sizes against familiar objects. The game shows a teal reference at actual size, lets you stretch an orange shape to match, then reveals the true measurement and source. I'd love to know how often you use quick visual comparisons when estimating UI element dimensions in your projects?
- Free daily size comparison game
- Guess the size of everyday objects, planets and dinosaurs
- Stretch silhouette to match real‑world scale
- Score up to 100 points per round
- Endless practice mode for unlimited rounds
- Real‑size teal reference object as a ruler
Size It Up is a free daily game where you guess the size of everyday objects, planets and dinosaurs.
- for
- Anyone who wants to test and improve their sense of scale.
- pricing
- free
Key features
- Three themed game modes — Classic, Cosmic Scale, and Prehistoric Giants each offer a daily puzzle and leaderboard.
- Real-size visual ruler — A teal object is shown at its actual size to serve as a reference for guessing.
- Interactive stretching tool — Drag or tap arrows to stretch an orange shape until it matches the reference size.
- Scoring system — Earn up to 100 points per round; perfect score requires a guess within 6% of the true size.
- Unlimited free play — Replay past puzzles or play endless rounds from any collection without limits.
- Source citations — Each size answer links to its source, such as ISO standards, NASA fact sheets, or museum specimens.
Use cases
- Practice estimating dimensions of common items for education or fun
- Compare planetary sizes for astronomy hobbyists
- Learn about dinosaur dimensions for paleontology enthusiasts
- Use the game in classrooms to teach scale concepts
Size It Up FAQ
Do I need an account to play?+
No, you can play as a guest; signing in with Google only adds leaderboard tracking and points.
How many rounds can I play each day?+
Five daily puzzles per game count toward streaks; free play offers unlimited rounds.
How is a round scored?+
Up to 100 points per round; guesses within 6% earn full points, with lower scores for larger errors.
Where do the size data come from?+
Sources include ISO standards, sports rulebooks, NASA fact sheets, museum specimens, and published papers.
Can I replay missed puzzles?+
Yes, the archive lets you replay any past daily puzzle.
Summarized by DevHunt from sizeitup.us · Oct 30, 2026. Details may change; check the official site.
