Solid Devtools is a Chrome Developer Tools extension specifically designed for debugging SolidJS applications. This free extension, developed by thetarnav, provides developers with a powerful set of tools to visualize and interact with Solid's reactivity graph. It also allows for inspecting component state and hierarchy, making it easier to understand and debug SolidJS applications.

Please note that Solid Devtools is currently in early development, so it may not have all the features and stability of a mature tool. It requires a runtime debugger library to work, which is not bundled with SolidJS at the moment. This is because the project is constantly evolving and requires frequent changes.

Overall, Solid Devtools is a promising tool for SolidJS developers who want to enhance their debugging capabilities. With its ability to visualize the reactivity graph and inspect component state, it can greatly simplify the debugging process and improve productivity.