Browser Use

Comparison | Browser Harness

Chrome DevTools MCP vs Browser Harness.

Same score on 100 public browser tasks, using a third of the median input tokens per task. Chrome DevTools MCP is built for debugging; Browser Harness for doing the task, in your real Chrome.

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Side by side

Score on 100 browser tasks: Browser Harness: 60.4 / 100; Chrome DevTools MCP: 61.0 / 100, a statistical tie
Input tokens per task (median): Browser Harness: 2.1M; Chrome DevTools MCP: 6.7M
Agent cost per task (median): Browser Harness: $0.042; Chrome DevTools MCP: $0.097
Built for: Browser Harness: Doing tasks on any site; Chrome DevTools MCP: Debugging: performance traces, network, console
Browser: Browser Harness: Your Chrome, with your logins; Chrome DevTools MCP: Its own profile. Your session needs --autoConnect and an Allow click per session
Setup: Browser Harness: Paste one prompt into your agent; Chrome DevTools MCP: Add an MCP server to your agent's config
Missing tool: Browser Harness: The agent writes it and keeps it; Chrome DevTools MCP: Fixed tool set
License: Browser Harness: MIT; Chrome DevTools MCP: Apache-2.0

Pick Chrome DevTools MCP to debug performance, network requests or console errors in your own app.

Source: Matched eval: method and per-task scores, BU Bench V2.1 tasks, Chrome DevTools MCP README, Chrome blog: debug your browser session, checked Oct 2026.

Questions

Is Browser Harness better than Chrome DevTools MCP?

On success, they tie. On 100 public BU Bench V2.1 tasks with the same agent (Codex, GPT-6 Luna), the same cloud browser and the same judge, Browser Harness scored 60.4 and Chrome DevTools MCP 61.0 out of 100, inside each other's confidence intervals. The difference is cost: Chrome DevTools MCP used 3.2x the input tokens per task (median 6.7M vs 2.1M), so the agent's bill was $0.097 vs $0.042 per task. One run per task; per-task scores are public.

Can I use both?

Yes. Use Chrome DevTools MCP when you profile or debug your app, and Browser Harness when the agent has to get something done on a site.

Is it my real browser?

Yes. Browser Harness works in the Chrome you already use, with your tabs, cookies and logins. Chrome asks once for permission.

What does it cost?

Nothing. Browser Harness is open source under MIT, and using your own Chrome is free. Cloud browsers are $0.02 per browser-hour if you want them.

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