Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Different Gases
In Air Has Weight, weigh an empty PET bottle against one pumped full of air — the number on the scale proves that invisible air really does weigh something. In Bigger, Smaller, heat a balloon and watch it swell, press it and watch it shrink, then move the scene deep underwater or up a mountain to see pressure change its volume too. In Which Gas Is It?, run tests on oxygen, carbon dioxide, nitrogen, and helium one by one to tell them apart and learn what each is used for. Invisible doesn't mean nonexistent — weight and volume make air's behavior visible.
Make a Melody
Connect notes to make a song! 🎼 Place one note in each of the eight spaces. As the dots rise, the sounds rise too, so you can see the melody’s shape. Try making a melody that goes up, one that goes down, and a mountain-shaped melody that rises and falls. 🔁 Next, repetition. Create the first four spaces, then repeat them exactly, one note higher, or upside down — songs we know are made this way, with repetition and little changes. 🏁 Last, the ending note. Change only the final note of the same melody, and it can feel «finished» or «still going». Does ending on si make you want to return to do? This app was made with code too · Remix it and share your melody with a friend!