Whether you’re new to coding or an experienced developer, CodeRunner is a worthy addition to your toolbox.

This lightweight but powerful code editor supports syntax highlighting and code completion for 25 languages out of the box. But one of its most useful (and unique) features is that it lets you run and debug code right within its editing window and preview output in the console pane.

This makes CodeRunner ideal for testing single-file programs and quickly editing a script, but it’s also handy for web development and Markdown-focused writing. You’ll be able to preview changes to web pages and Markdown documents in the console pane as you type.

The app’s web inspector is perfect for testing JavaScript, CSS styles and other HTML elements. And if you’re learning a coding language, you can consult online documentation for that language right from within the app’s window.

It isn’t intended to replace Xcode or more fully featured editors, but sometimes you need an alternative tool for the job. CodeRunner is different and useful enough to warrant a place in your kit.