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AI-powered browser automation through natural language and connected AI agents. Built for the future of autonomous browsing.

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Built for the Modern Web

Average success rates on Online-Mind2Web, with FSB included.

Everything you need for intelligent browser automation, powered by leading AI models.

Online-Mind2Web

Top 10 agents

Average success rate
  1. 01Hark 97.7%
  2. 02Navigator (n1.5) 97.3%
  3. 03ACT-2 92.7%
  4. 04 92.3%
  5. 05Navigator (n1-preview) 78.7%
  6. 06Google Computer Use 69.0%
  7. 07Operator 61.3%
  8. 08ACT-1 (Aug 2025) 57.3%
  9. 09Claude Computer Use 56.3%
  10. 10ACT-1 (Jul 2025) 45.7%

FSB: AI-reviewed result (277/300). Other values are transcribed from the leaderboard.

Evaluation methods differ; numerical placement is illustrative, not an official leaderboard ranking.

Tested on FSB v0.9.92 · MCP v0.11.2It only gets better;)

Better Than All of Them. Without Vision.

Project Mariner, Claude Computer Use, OpenAI Operator, OpenClaw. They all rely on vision to understand the page. FSB reads the actual DOM. No vision needed. Faster. Cheaper. More accurate.

Project Mariner

Vision

Computer Use

Vision

Operator

Vision

OpenClaw

Vision

DOM-Based

Better than all of them. Pure structural intelligence. Zero vision. Zero guessing.

50-200ms
Per step vs 1-3s
~$0.03
Per 100 steps vs $0.18
Yes
Hidden elements vs No

Works WITH All of Them

FSB does not just compete. It complements. Through its MCP server, Claude Code, Codex, Cursor, Windsurf, and any MCP-compatible agent can use FSB as their browser automation layer. The intelligence of any AI combined with the precision of FSB's DOM engine.

One command. Pick your agent.
Native API handlers

It clicks when it must. It calls APIs when it can.

FSB no longer has to drive a UI for everything. For supported apps it talks straight to the app's own authenticated API through your logged-in session, far faster and more reliable than DOM automation, and falls back to clicking automatically when no API exists.

Inspired byOpenTabs

Any agent. Any model. One browser engine.

FSB is the browser layer, not another chatbot. Whatever does the thinking, FSB reads the page structure, takes the action, and verifies the result. Connect it three ways.

Set up one path now and add the others anytime from Settings. They share the same engine, site guides, and memory.
Your agent thinks
Reads · Acts · Verifies
Your browser

Your agent drives FSB

Coding agents and MCP clients call FSB's tools directly. Your agent's own model does the reasoning, so there is no FSB key to add and no second bill.

68 MCP toolsOne-command installNo API key
Claude CodeClaude DesktopCodexCursorVS CodeWindsurfOpenCodeOpenClawHermesAny MCP client

Open Source. MIT Licensed. Built for Everyone.

FSB is free and open source. Inspect the code, contribute features, or fork it for your own use.

View on GitHub