Codea

"It’s kind of like the Garage Band of coding." – Wired
"Codea for iPad is a super slick way to write and run programs on your iPad." – Gizmodo
Codea lets you create games and simulations — or just about any visual idea you have. Turn your thoughts into interactive creations that make use of iPad features like Multi-Touch and the accelerometer.
We think Codea is the most beautiful code editor you'll use, and it's easy. Codea is designed to let you touch your code. Want to change a color, or an image? Tapping will bring up visual editors that let you choose exactly what you want.
Codea is built on the Lua programming language. A simple, elegant language that doesn't rely too much on symbols — a perfect match for iPad.
Here's how you use it: type your code. Press play to watch it run. Interact with it. Get creative.
FEATURES
• A fully featured 2D and 3D renderer
• Lots of great example projects to learn from, including games
• Touch your code: tap colors, images and sounds to adjust them
• Export your finished projects to Xcode to produce real apps
• Complete in-line reference documentation accessible from keyboard
• Intelligent syntax highlighting and auto-completing code editor
• Import your own assets from Dropbox
• Full 2D and 3D physics engines for complex motion
• Add parameters so you can tweak variables at runtime
• Interact with accelerometer and multi-touch on your device
• Generate retro-game sound effects
• GLSL Shader Language support with live shader editor
• Bluetooth keyboard support and keyboard shortcuts
• Air Code: code live from your PC using WiFi
• Much, much more
IMPORTANT INFORMATION
• Join the forums at https://talk.codea.io to ask questions, share ideas and get help when you need it
• If you need help or wish to get in contact with us, please use the support link on this page
• Privacy policy https://codea.io/privacy
• Terms https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
SUBSCRIPTION
• Codea is free to use for projects up to 500 lines, after which you can subscribe to Codea Pro for access to advanced features and unlimited project size
• Monthly and yearly plans available
• Lifetime one-time purchase also available
• Pricing may vary by region. Your subscription will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription in your App Store account settings.