rubyi is an iOS app developed by 小文 黄 that allows users to learn, run, and share Ruby scripts. The app offers a range of features including autocomplete, auto-indentation, and code coloring to enhance the coding experience. Users can run code either in the built-in browser or the text editor by simply selecting the desired text. The app also supports horizontal screen development and provides code templates for easy file creation.

One unique feature of rubyi is its compatibility with Apple Watch, allowing users to run code directly from their wrist. Users can also enter Ruby code using the keyboard and execute it, with support for the "gets" function. The app supports various file types, including txt, pdf, chm, mp3, m4v, zip, gif, png, html, rb, and doc, enabling users to utilize the file system for their coding needs.

rubyi offers customizable settings such as code color and font size, cursor movement, and background image and color. Users can also access learning materials through the built-in browser and save code and learning materials for future reference. Sharing code is made easy with options to share via email, Weibo, Twitter, and Facebook. The app even allows users to generate QR codes for their Ruby code or learning materials.

With its comprehensive features and user-friendly interface, rubyi is a valuable tool for learning and coding in Ruby on iOS devices.