Browser Use

Comparison | Browser Harness

Playwright MCP vs Browser Harness.

Same score on 100 public browser tasks, using half the median input tokens per task. And Browser Harness works in your real Chrome, logged in as you.

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PromptQA my website end to end. Test signup, checkout, mobile layout, and console and network errors. Return screenshots and a prioritized fix list.

Side by side

Score on 100 browser tasks: Browser Harness: 60.4 / 100; Playwright MCP: 60.0 / 100, a statistical tie
Input tokens per task (median): Browser Harness: 2.1M; Playwright MCP: 4.4M
Agent cost per task (median): Browser Harness: $0.042; Playwright MCP: $0.066
Browser: Browser Harness: Your Chrome, with your logins; Playwright MCP: Its own browser profile. Your Chrome needs the Playwright Extension
Setup: Browser Harness: Paste one prompt into your agent; Playwright MCP: Add an MCP server to your agent's config
Missing tool: Browser Harness: The agent writes it and keeps it; Playwright MCP: Fixed tool set, more behind --caps flags
Many browsers at once: Browser Harness: Browser Use cloud, $0.02 per browser-hour; Playwright MCP: Point --cdp-endpoint at a remote browser
License: Browser Harness: MIT; Playwright MCP: Apache-2.0

Pick Playwright MCP for a clean, isolated browser in tests, or if your team already runs Playwright.

Source: Matched eval: method and per-task scores, BU Bench V2.1 tasks, Playwright MCP README, checked Oct 2026.

Questions

Is Browser Harness better than Playwright 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 Playwright MCP 60.0 out of 100, inside each other's confidence intervals. The difference is cost: Playwright MCP used 2.1x the input tokens per task (median 4.4M vs 2.1M), so the agent's bill was $0.066 vs $0.042 per task. One run per task; per-task scores are public.

Can I use both?

Yes, they do not conflict. Use Playwright MCP for isolated test runs and Browser Harness for work on sites you are logged in to.

Does Browser Harness have an MCP server?

Yes, browser-harness-mcp, for any MCP client. You usually do not need it: the setup prompt installs Browser Harness as a skill, with no config to edit.

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.

You will never use
the browser again.

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