RD

Ruby debug

Free#15 of 27 in Debuggers

Open-source debugging for Ruby MRI 2.7 and later.

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Visit Ruby debug

At a glance

• Editor score
  Not yet scored
• Pricing
  Open source
• Best for
  Ruby application debugging
• Paid from
  None
• Supported languages
  Ruby (MRI) 2.7 and later
• Facts checked
  20 Sep 2026

• Where it wins

  • Supports conditional, exception, path, method, line, and watch breakpoints
  • Adds remote debugging, recording and replay, tracing, and expression evaluation
  • Connects with VS Code and Chrome DevTools

• Where it doesn't

  • Focused on Ruby MRI rather than multi-language debugging
  • Requires installing and using the Ruby debug gem
  • Command-line workflow may not suit teams seeking a hosted debugger

Our verdict on Ruby debug

Ruby debug is an open-source debugging library and command-line debugger for Ruby MRI 2.7 and later. It is designed for Ruby developers who need to inspect applications and scripts locally, pause execution at precise points, evaluate expressions, trace method calls or lines, and investigate exceptions. The tool is installed as the Ruby debug gem and combines console-based workflows with integrations for VS Code and Chrome DevTools. Its scope is deliberately centered on Ruby MRI rather than a broad, multi-language debugging environment.

The debugging feature set covers common investigation tasks and more advanced workflows. Developers can use line, method, conditional, path, watch, and exception breakpoints, then step, continue, finish, and navigate frames. Expression evaluation and program-status inspection help examine runtime state, while method-call and line tracing provide visibility into execution flow. Recording and replay add a time-travel debugging option, allowing developers to review recorded behavior rather than relying only on a live session. Remote debugging is available over Unix domain sockets and TCP/IP, which extends the tool beyond a single local process.

Ruby debug is a strong fit for teams working within its supported Ruby version range and wanting an open-source debugger with both command-line control and editor or browser-based options. VS Code and Chrome DevTools integration can make the workflow more familiar for developers who prefer graphical inspection alongside rdbg. The main trade-off is its narrow platform scope: teams debugging several programming languages, seeking a hosted service, or preferring a fully managed commercial product should look elsewhere. For Ruby MRI applications and scripts, its combination of breakpoints, remote sessions, replay, tracing, and expression evaluation gives it substantial debugging depth without a paid plan structure.

Ruby debug pricing

Ruby debug fact sheet

Ruby debug integrations

Ruby debug lists 2 integrations on its own site.

• VS Code
• Chrome DevTools

Alternatives to Ruby debug

• GDBA free, open-source debugger with unusually broad language, target, and remote-debugging coverage.—
• LLLDBA capable, free debugger for C/C++ and Apple-platform development.—
• WinDbgA free, deeply capable debugger for Windows applications, drivers, and crash analysis.—

See all Ruby debug alternatives →

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