An open-source browser agent that lets a choice model pick each action from the controls actually on the page, returning answers with verbatim citations.
fastbrowse demo driving a live store
1 / 2Overview
What is fastbrowse?
Fastest open source browser agent
fastbrowse is a fast, open-source browser agent that works differently from screenshot-based agents. Instead of asking a model to decide every step from a screenshot, it indexes the page into the controls it actually has — every button, link and field — and lets Jev, a choice model, pick the next step from that list. If it is unsure, it falls back to a standard model. Because it only picks from what is on the page, it cannot click something that is not there.
Every answer comes with citations: each claim links to a verbatim quote from the page, so results can be checked. Safety is enforced in code — irreversible actions stop until explicitly authorized, secrets are typed only on their declared origin, and step, time and dollar limits are enforced. It runs as a CLI, a Python library, Node and Go SDKs, an MCP server, or a skill for coding agents, on a cloud browser or local Chrome.
Note that the project describes itself as highly experimental and not yet recommended for production use.
Platforms and languages
fastbrowse Availability
Platforms
Languages
Capabilities
fastbrowse Key Features
Picks, never invents actions
Each page is indexed into the controls it has and Jev, a choice model, picks one, so it cannot click something that is not on the page.
Cited answers
Every claim in a complete answer cites a verbatim quote from the page, with a link that scrolls to it.
Code-held safety gates
Submit, pay, delete and send stop until you allow them; secrets are typed only on their declared origin and models see only their names.
Any browser
Runs on a cloud browser by default, local Chrome, or any Chromium browser or Electron app already running.
Every interface
A CLI, a Python library, Node and Go SDKs, an MCP server, and a skill for coding agents.
Best for
Who uses fastbrowse?
Developers and agent builders who need browser automation
Give an AI agent a browser that acts on real page controls and returns checkable, cited answers
Plans and access
fastbrowse Pricing
Free
Free and MIT licensed; you pay your own model provider (e.g. OpenRouter) for the models it calls
Common questions
fastbrowse FAQs
How is fastbrowse different from screenshot-based browser agents?
It indexes the page into real controls and lets Jev pick from them, so it cannot click something that is not on the page, and every answer cites a verbatim quote.
What does fastbrowse cost?
It is free and MIT licensed. You pay your own model provider, for example OpenRouter, for the models it calls.
What do I need to run it?
uv, which fetches Python 3.13 or newer itself, Chrome or Chromium, and an OpenRouter key. Run locally with --local or use a cloud browser.
Is fastbrowse ready for production?
No. The project describes itself as highly experimental and not yet recommended for production use.
Which interfaces are available?
A CLI, a Python library, Node and Go SDKs, an MCP server, and a skill for coding agents.
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