Touch Lua is a programming application designed for the iPhone platform, offering a simple and modern programming experience using Lua. The program provides two modes: program and console, along with support for multi-program and directories. Users can export or email programs and results, utilize a powerful editor with syntax highlighting, and engage in graphics, audio, database, and network programming. Additionally, Touch Lua features a text screen for stylized text printing, built-in help resources like tutorials and a wiki, and sample programs to aid learning.

Touch Lua serves multiple purposes such as learning programming, applying scripting skills, rapid prototyping, functioning as an advanced calculator, and a graphing tool. The program also offers in-app purchases for additional features like the Nitro Graphics Library for creating 2D and 3D graphics using the device's GPU, the Draw Library for creating complex graphics, an Audio Library for playing music and sound effects, a Socket Library for network support, and a Turtle Library for Logo-like graphic commands to encourage logical thinking.