browser-harness
Self-healing browser harness that enables LLMs to complete any task.
The Lens
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
Updated Oct 2026
Browser Harness lets your coding agent (Claude Code, Codex or Cursor) drive your real Chrome, logged in as you: open pages, click, type, read and download. It talks to Chrome over the DevTools Protocol, and when a helper is missing the agent writes one. Free and MIT licensed, from the Browser Use team.
Setup is one prompt pasted into your agent, which installs it with uv and has you tick remote debugging in chrome://inspect. Cursor and other MCP clients use the bundled MCP server. It's no longer a tiny script: it ships interaction guides and a growing library of site-specific skills. In Browser Use's own benchmark, no tool beat it on score and it used the fewest tokens.
Local use costs nothing. Browser Use Cloud is pay-as-you-go at $0.02 per browser-hour plus $5/GB for residential proxies. Solo and small teams: free on your own Chrome. Larger teams running many browsers: the cloud is cheap.
The catch: it gets your whole logged-in browser, and telemetry is on by default. Each run sends the script your agent wrote and up to 20,000 characters of its output to PostHog, which can include page text from your accounts. Run browser-harness telemetry disable first.
Free vs Self-Hosted vs Paid
free self hosted paid cloudFree: The harness is MIT licensed with full local functionality against your own Chrome, plus browser-harness-mcp for MCP clients. Telemetry is opt-out (browser-harness telemetry disable).
Self-hosted: Runs on your machine: install with uv (Python 3.11+ per PyPI, the setup prompt asks for 3.12), then tick remote debugging in chrome://inspect on Chrome 144+, or point it at any CDP endpoint. No server to run.
Paid: Browser Use Cloud is optional and has no subscriptions; credits never expire. Cloud browsers cost $0.02/browser-hour, managed residential proxy traffic $5/GB, direct or bring-your-own-proxy egress $0.20/GB. Free accounts get a one-time $1 credit (eligible Google, GitHub or Microsoft signups) and 10 concurrent sessions. Top-ups start at $5; total paid unlocks concurrency ($100 for 50 sessions, $1,000 for 250, $5,000 for 500, $25,000 for 1,000). Enterprise adds custom concurrency, SLAs, HIPAA and zero data retention at custom pricing.
Free and MIT on your own Chrome. Cloud browsers are pay-as-you-go at $0.02 per browser-hour plus traffic, with no subscription.
What to do by team size
- Solo
- free on your own logged-in Chrome; turn telemetry off first
- Small team
- free locally; buy Browser Use Cloud credits only when you need parallel browsers
- Medium team
- Browser Use Cloud at $0.02 per browser-hour once you need many isolated browsers
- Large team
- Browser Use Cloud Enterprise for custom concurrency, SLAs and zero data retention
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- Browser Use (Organization)
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