Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Which Way Is North?
When you unfold a map, which way is north? 🧭 Turn the compass needle through the eight directions. The gray tail moves too, so you can see that opposite directions always face each other. 🗺️ Next, explore a map of our neighborhood. Which way is the park from the school? Here’s the fun part: the same two places can have opposite directions depending on where you look from. 🚶 Finally, find your way. Tap a direction button to walk one square at a time to your destination. Going diagonally takes fewer steps—how few can you use? This app was made with code too · Remix it with a map of your school neighborhood! },
Mountains in Lines
How can we draw a mountain’s height on flat paper? 🍰 Slice the mountain horizontally at equal heights. The side view appears on the left and the top view on the right, making it easy to see that “each cut becomes a line.” The more closely you slice, the more lines you get—and the more detail you see. ⛰️ Now keep the height the same and change only the mountain’s width. A narrow base makes the lines bunch up; a wide base spreads them out—so “close lines mean steep slopes.” 🗺️ Finally, read a real contour map. Find the highest and lowest places between two peaks! This app was made with code too · Remix it and draw the hill behind your neighborhood!
Who Sets Prices?
Does the shopkeeper choose prices freely? 🙋 Keep 4 items on the shelf and add more shoppers. As everyone tries to buy, the price rises! Reduce the shoppers, and the price falls; when shoppers and items match, the price stays put. 📦 Now keep the shoppers the same and add more items — just like prices falling after a bumper harvest. 👛 One last twist: set a price for eight people with different amounts of money. A higher price may mean more earnings, but more people will be unable to buy. Find a price everyone can afford, and one only a single person can afford! This app was made with code too · Remix it into a bargain market for your class?
Is Cheaper Really Cheaper?
Is the bigger pack always the better deal? ⚖️ 200g for 24🪙, 500g for 55🪙 — by the sticker price, the small pack looks cheaper, but turn on “See price per 100g” and the story changes. Swipe through the shelves and you’ll find places where the big pack costs more. 🎁 Next come the deals: buy 1 get 1, buy 3 get 1, 25% off, second half price — they sound different, but when you check the price per item, three are exactly the same! Can you find a deal where you need to buy four even though you only need one? 🕵️ Finally, the shelf. Rank four packs by price per 100g to pick the truly cheapest one. The biggest wasn’t always the cheapest, was it? This app was made with code too · Shall we remix it with the prices in our own shopping cart?
Swap and Swap
How did people get things before money? 🤝 Look at what villagers «have → want» and match them in pairs. Bartering works only when both sides want what the other has—one-sided wants won’t make a trade. The salt seller wants rice, but the rice owner doesn’t want salt, so he can’t trade with anyone. 🐚 So people chose something «everyone would accept». Once shells appeared, selling and buying became separate: if one sack of rice isn’t enough, sell another. 🪙 Tap to see what can become money. Fish don’t last long, and rice is heavy. What has all four qualities? This app was made with code too · Remix it and build a village with things from our class!