Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Units of Length
Ants are 5mm, marathons are 42km 📏 Place objects on a 20cm ruler and read the millimeter ticks — object tips snap right onto the lines. 🔄 In Unit Converter, see the same length in mm, cm, m, and km all at once. An ant in km is 0.000005km! That’s why choosing the right unit matters. 🎯 In Challenges, convert units, pick the best unit, and guess which is longer — comparison bars are hidden, so convert first, answer, then check with the bars. Supports 7 languages
Comparing Sizes
Which one is bigger? 📏 Play independently without reading. 🐘 In Big & Small, compare objects side-by-side as big and small are asked interchangeably. 📏 In Long & Short, left-aligned edges make comparing lengths easy. 📶 Tap 3–4 items in size order. Don't worry about mistakes — objects just wobble gently without restarting! Collect ⭐ as you answer. Mute available. Supports 7 languages.