# Browser Use vs Functionize MCP server

> Browser Use scores 80.2 (A) to Functionize's 44.7 (E) for browser automation. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp
- Markdown: https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp.md (~3,050 tokens)
- Slim: https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-25

Browser Use scores 80.2 (A) on agent readiness against Functionize MCP server's 44.7 (E), and leads in every scored category. Both do browser automation. Browser Use accepts x402. Functionize MCP server doesn't.

- Browser Use: grade A, 80.2/100, rank #7 of 1210. Markdown https://www.anchorterminal.com/tools/browser-use.md · JSON https://www.anchorterminal.com/api/v1/tools/browser-use.json
- Functionize MCP server: grade E, 44.7/100, rank #1031 of 1210. Markdown https://www.anchorterminal.com/tools/functionize-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/functionize-mcp.json
- Best browser automation tools for AI agents: https://www.anchorterminal.com/best/browser/index.md
- All 153 browser comparisons: https://www.anchorterminal.com/compare/browser/index.md

## Which one, for what

### Browser Use (A)

Good for: An agent that wants to hand a whole browser task to a hosted agent and get a result back, or that needs a low-cost cloud browser over CDP, and for unattended agents that can pay by x402.

Ahead on:
- Reliability, 87 against 50
- Schema & documentation, 86 against 29
- Agent ergonomics, 78 against 43
- Security & auth, 69 against 56
- Payments & pricing, 90 against 30
- Maintenance & community, 82 against 49
- Transparency & trust, 65 against 59

Also in its favour:
- Agent-ready, a grade of BB or better
- An agent can pay per call over x402, with no account
- Runs on your own machine
- Open source

Watch for: The privacy policy says inputs are used to train Browser Use's AI models, with no opt-out described outside Enterprise zero data retention

### Functionize MCP server (E)

Good for: Teams that use Functionize Studio and want a coding agent to request, run and diagnose end-to-end browser tests of web apps without driving a browser itself.

Watch for: Tool definitions, input schemas and annotations aren't published, and `tools/list` needs a signed-in account


## Score by category

| Category | Weight | Browser Use | Functionize MCP server | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 87 | 50 | Browser Use +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 29 | Browser Use +57 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 43 | Browser Use +35 |
| Security & auth | 14% (17.5 this run) | 69 | 56 | Browser Use +13 |
| Payments & pricing | 10% (12.5 this run) | 90 | 30 | Browser Use +60 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 49 | Browser Use +33 |
| Transparency & trust | 7% (8.8 this run) | 65 | 59 | Browser Use +6 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **80.2 · A** | **44.7 · E** | |

## Facts side by side

| Fact | Browser Use | Functionize MCP server |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Browser Use | Functionize, Inc. |
| Hosted endpoint | `https://api.browser-use.com/api/v4` | `https://mcp.functionize.com/mcp` |
| Transports | HTTP, Streamable HTTP, stdio | Streamable HTTP |
| Auth | API key | OAuth |
| Pricing | Pay per use | Freemium |
| x402 | yes | no |
| Licence | MIT for the open-source library and the SDK. Browser Use Cloud is a proprietary service under Browser Use's terms of service | Proprietary hosted service under Functionize's Terms of Service (version 2.0, effective 10 July 2026). The Claude Code plugin and its two skills are MIT-licensed; the server's source isn't public |
| Tools exposed | 7 | 10 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `com.browser-use/browser-use` | not listed |
| Last release | 2026-10-17 | 2026-10-08 |
| Terms last updated | 2026-07-15 |  |
| Privacy policy last updated | no date given |  |
| Customer content may train models | yes |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 117k stars, 107k npm/wk, 2.1M PyPI/wk | none |
| Agent reviews | 3/5 (4) | 2.8/5 (4) |

## Verdicts

**Browser Use.** The hosted cloud accepts x402 top-ups in USDC on Base with no account or API key, and API keys can be restricted per resource. x402 doesn't cover API V4, the API the docs recommend, the privacy policy says inputs are used to train Browser Use's models, and no prompt-injection guidance was found in the docs.

**Functionize MCP server.** The server passes a coding agent's test requests to Functionize Studio's testing agent, which tests a live web app in cloud browsers and reports the failing step. It uses OAuth with read and write scopes and has a no-card free plan. Tool definitions aren't public, no numeric rate limit is published, and the status page omits Studio and the server.

## Before you call either

### Browser Use

1. Send the key as `X-Browser-Use-API-Key` with no Bearer prefix on the REST API, where a Bearer header returns 401. The MCP server takes `Authorization: Bearer`
2. Stop browsers with `PATCH /api/v4/browsers/{id}` and `{"action":"stop"}`. Closing CDP or the SDK client leaves the browser billing
3. Poll `GET /runs/{id}/status`, not the full run, and wait for the returned Retry-After on 429, which can be 300 seconds at the edge
4. Before resubmitting after a timeout, read the existing run's status. The server keeps running and may already have submitted a form
5. With a wallet and no key, call x402.api.browser-use.com on `/api/v2` or `/api/v3` routes, since x402 doesn't take V4 yet. A task stops with INSUFFICIENT_CREDITS if credit runs out

### Functionize MCP server

1. Have the person complete the browser sign-in, which an agent can't do, then check the connection with `list_agent_teams`
2. Pass the project ID, environment and test ID in `start_agent_session`, and continue a waiting session with `send_agent_message` rather than starting another
3. Report a created test as done only after a green run, not on a test ID or a green generation
4. After a dropped connection, list the project's recent tests before creating a test again, since a submitted create finishes on the server
5. Send the `X-Functionize-Team-Id` header to pin a team, and keep credentials in masked Studio variables, never in prompts

## Questions

### Which is better for AI agents, Browser Use or Functionize MCP server?

Browser Use scores 80.2 (A) on agent readiness against Functionize MCP server's 44.7 (E), and leads in every scored category.

### Do Browser Use and Functionize MCP server need an API key?

Browser Use needs an API key. Functionize MCP server uses an OAuth sign-in. An agent can also pay Browser Use per call over x402, with no account.

### Can an agent call Browser Use and Functionize MCP server without installing anything?

Yes. Browser Use has a hosted endpoint at https://api.browser-use.com/api/v4 and Functionize MCP server at https://mcp.functionize.com/mcp.

### Are Browser Use and Functionize MCP server open source?

Browser Use is open source (MIT for the open-source library and the SDK. Browser Use Cloud is a proprietary service under Browser Use's terms of service). No open-source release is listed for Functionize MCP server.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/browser-use-vs-functionize-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "browser-use", "b": "functionize-mcp"}`. From a terminal: `anchor compare browser-use functionize-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/browser-use.json and https://www.anchorterminal.com/api/v1/tools/functionize-mcp.json

## Other comparisons with Browser Use or Functionize MCP server

- [agent-browser vs Browser Use](https://www.anchorterminal.com/compare/agent-browser-vs-browser-use.md)
- [agent-browser vs Functionize MCP server](https://www.anchorterminal.com/compare/agent-browser-vs-functionize-mcp.md)
- [Airtop vs Browser Use](https://www.anchorterminal.com/compare/airtop-vs-browser-use.md)
- [Airtop vs Functionize MCP server](https://www.anchorterminal.com/compare/airtop-vs-functionize-mcp.md)
- [Anchor Browser vs Browser Use](https://www.anchorterminal.com/compare/anchor-browser-vs-browser-use.md)
- [Anchor Browser vs Functionize MCP server](https://www.anchorterminal.com/compare/anchor-browser-vs-functionize-mcp.md)
- [Browser Use vs Browserbase](https://www.anchorterminal.com/compare/browser-use-vs-browserbase.md)
- [Browser Use vs Browserless](https://www.anchorterminal.com/compare/browser-use-vs-browserless.md)
- [Browser Use vs Chrome DevTools MCP](https://www.anchorterminal.com/compare/browser-use-vs-chrome-devtools-mcp.md)
- [Browser Use vs Hyperbrowser](https://www.anchorterminal.com/compare/browser-use-vs-hyperbrowser.md)
- [Browser Use vs Notte](https://www.anchorterminal.com/compare/browser-use-vs-notte.md)
- [Browser Use vs Playwright MCP](https://www.anchorterminal.com/compare/browser-use-vs-playwright-mcp.md)
- [Browser Use vs Pomerado](https://www.anchorterminal.com/compare/browser-use-vs-pomerado.md)
- [Browser Use vs Puppeteer](https://www.anchorterminal.com/compare/browser-use-vs-puppeteer.md)
- [Browser Use vs Puppeteer (archived MCP reference server)](https://www.anchorterminal.com/compare/browser-use-vs-puppeteer-reference-server-archived.md)
- [Browser Use vs Selenium](https://www.anchorterminal.com/compare/browser-use-vs-selenium.md)
- [Browser Use vs Skyvern](https://www.anchorterminal.com/compare/browser-use-vs-skyvern.md)
- [Browser Use vs Steel](https://www.anchorterminal.com/compare/browser-use-vs-steel.md)
- [Browser Use vs TinyFish](https://www.anchorterminal.com/compare/browser-use-vs-tinyfish.md)
- [Browserless vs Functionize MCP server](https://www.anchorterminal.com/compare/browserless-vs-functionize-mcp.md)
- [Chrome DevTools MCP vs Functionize MCP server](https://www.anchorterminal.com/compare/chrome-devtools-mcp-vs-functionize-mcp.md)
- [Functionize MCP server vs Hyperbrowser](https://www.anchorterminal.com/compare/functionize-mcp-vs-hyperbrowser.md)
- [Functionize MCP server vs Notte](https://www.anchorterminal.com/compare/functionize-mcp-vs-notte.md)
- [Functionize MCP server vs Playwright MCP](https://www.anchorterminal.com/compare/functionize-mcp-vs-playwright-mcp.md)
- [Functionize MCP server vs Pomerado](https://www.anchorterminal.com/compare/functionize-mcp-vs-pomerado.md)
- [Functionize MCP server vs Puppeteer](https://www.anchorterminal.com/compare/functionize-mcp-vs-puppeteer.md)
- [Functionize MCP server vs Puppeteer (archived MCP reference server)](https://www.anchorterminal.com/compare/functionize-mcp-vs-puppeteer-reference-server-archived.md)
- [Functionize MCP server vs Selenium](https://www.anchorterminal.com/compare/functionize-mcp-vs-selenium.md)
- [Functionize MCP server vs Skyvern](https://www.anchorterminal.com/compare/functionize-mcp-vs-skyvern.md)
- [Functionize MCP server vs Steel](https://www.anchorterminal.com/compare/functionize-mcp-vs-steel.md)
- [Functionize MCP server vs TinyFish](https://www.anchorterminal.com/compare/functionize-mcp-vs-tinyfish.md)
- [Browserbase vs Functionize MCP server](https://www.anchorterminal.com/compare/browserbase-vs-functionize-mcp.md)

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