ruby-test-ide serves a browser IDE for any Ruby project. Note: Still a work in progress Instead of static analysis or type-annotation files, it evaluates your code in sandboxed workers and asks the live objects what they can do (irb-style completion, hover docs via ri, per-line debugger annotations, go-to-definition from Method#source_location). For code paths the buffer can't safely execute — network calls, mocked edges — it runs your test suite (any framework, via .ruby_ide.yaml) with a TracePoint observer preloaded and learns the argument/return types your code really used.