Open source / CLI
edgefit.
Know it runs on the edge before you deploy.
edgefit reads a project and every dependency it imports, then tells you which Node and Web APIs your target runtime does not support. You find the problem in a pull request, not in a failed deploy.
The whole dependency tree
Most failures come from a package three levels down. edgefit follows imports from the entry point with the export conditions of the target, so it checks the Workers build of a library and not its Node build. Each finding names the package, the file, the line and the import chain.
Static, pinned and honest
The check needs no Worker, Bun or Deno installation. All compatibility data is vendored and pinned, and each result links to its source. Code that edgefit cannot analyze is reported as unknown, never as safe.
One command, many runtimes
Check workerd, Bun, Deno, Deno Deploy, Netlify Edge and Vercel Edge, or run compare to see every runtime side by side. A GitHub Action runs the same check on each pull request.
