AppMap is a free and open source visualization tool that allows you to see how your software works as it’s running. You can use AppMaps to onboard to unfamiliar code, debug hard-to-fix issues, review code behavior changes before making a commit, and improve the quality of code reviews.
AppMap works best for mapping web services and web applications. Join our community to help us expand support for more types of applications and frameworks!
Currently, AppMap supports Spring, Rails, and Express projects (AppMap for JavaScript is now available in beta!). The most up-to-date list of frameworks and languages we support is here.
AppMap provides interactive maps of your application’s behavior, so you can see what your code is really doing as it runs, including:
- Dependency maps that display how your app’s components are all connected, so you can quickly see how changes affect the big picture
- Trace diagrams that show details about how a feature works, so you can find optimization opportunities and investigate tricky bugs
- SQL query data, so you can see exactly what’s happening between your code and the database
- Web services data, so you can see what message your app received and how it responded
- Labels that identify the key functions in source code, so you can easily find critical code events and ensure they’re configured and used properly