Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Make Your Own Function
🧰 What if the same code repeats 4 times? Just bundle it up and give it a name! Changing ⭐ to 🌙 takes 4 clicks without functions, but only 1 click with a function — compare the clicks yourself! 🎛️ Passing arguments lets the same function do something different each time, and ↩️ returning values teaches you return. See what happens when you omit return — it even runs live to show undefined on screen! This app was built with code too · Remix it and create your own functions!
When You Type
⌨️ You learned button clicks, now let's type! Type in the box and watch the screen react instantly — counting letters, changing colors, or growing bigger. Try replacing input with change to see how it waits until you finish typing! In 🔍 What to Type?, read the code to solve the puzzle, and in ✅ Validation, set rules like "4+ letters to pass" and test them with the 🧪 button like a real coder. Built with code · Remix to create your own input box!
Line Up the Boxes
📦 One value fits in one box, but what about many? Line them up and give each an index! Try push, pop, unshift, and shift—see how adding to the front shifts all numbers, while adding to the back keeps them in place. You'll instantly see why counting starts at 0! 🔍 In "Step-by-Step", watch a loop visit each box to calculate totals, find max values, count items, locate positions, or double numbers. 🎯 "Target Match" has 6 puzzle levels where you create target lines in as few moves as possible. Built with code—remix it to make your own box lineup!
When You Press a Button
👆 Your page comes alive at last! Pick "When (click) + What (background)" to build real working code — tap the button below and watch the box change live! Switch to double-click, and a single tap won't budge it! 🔢 With Memory Buttons, try adding 1, doubling, toggling 🌞🌙, growing bigger, or showing 🎉 on click 3. You'll see firsthand why variables are so useful! 🎮 In Remote Control, assign different tasks to 3 buttons. This app was made with code too — ready to remix and create your own buttons?
Bug Hunter
🐛 The code is broken! 🎯 Expected values and ❌ actual values don't match, right? Tap the line where the bug is hiding. Choose how to fix it, run the updated code, and check if you get the ⭕ correct result! If you pick the wrong fix, you'll see what happens so you can learn why. Includes 7 common real-world bugs: off-by-one errors, out-of-bounds arrays, missing variable assignments, confusing = and ===, and more. Features 7 main challenges + Endless Hunt + 💡 Bug Encyclopedia! Built with code too — remix it to hide your own bugs!
Daily Code Quiz
💻 Read the code and guess "What will this output?" Every day, 3 new challenges unlock for everyone worldwide! Master variable updates, string concatenation, for-loop counts, 0-indexed arrays, and return values — key concepts for beginners. Don't worry if you make mistakes: 💡 Hint Notes explain the rules, and the 🧪 Practice tab lets you solve unlimited problems by topic. Share your ⭕❌ result card with friends! 🔥 How long can you keep your daily streak going?