TIO Syntax Highlighter is a free Chrome add-on developed by fienestar. It is designed to enhance the Try It Online (TIO) platform by providing syntax highlighting and autoindentation features.

With TIO Syntax Highlighter, users can easily read and understand code on the TIO platform. The add-on supports a wide range of programming languages, including R, C#, Common Lisp, Dart, Swift, VB, Haskell Literate, CoffeeScript 2, Powershell, and Objective-C. This makes it a valuable tool for programmers who frequently use TIO for code testing and sharing.

One of the standout features of TIO Syntax Highlighter is its ability to automatically indent code. This ensures that code is properly formatted, making it easier to read and debug. Additionally, the add-on allows users to customize the tab size to their preference, further enhancing the code readability.

Overall, TIO Syntax Highlighter is a useful add-on for developers who rely on the Try It Online platform. Its syntax highlighting and autoindentation features greatly improve the code reading experience, making it an essential tool for code testing and sharing.