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Toolnanobrowser (alexchenzl)/10 trustVerified
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Nanobrowser

Open-source browser agent as a Chrome extension — the free Operator.

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About

Nanobrowser is an open-source AI web-automation tool that runs as a Chrome extension: a multi-agent system (planner that self-corrects, navigator that acts) driving your real browser, positioned as a free alternative to OpenAI's $200/mo Operator. Bring your own API keys (OpenAI, Anthropic, Gemini, DeepSeek, Grok, Azure, OpenRouter, Ollama, or any OpenAI-compatible provider); everything runs locally in your browser, privacy-focused. 14.1k stars, Apache-2.0. Browser agents remain brittle on complex/anti-bot sites — scope its permissions and supervise it.

What it can do

  • **Multi-agent**: planner + navigator with self-correction
  • **Any LLM**: 9+ providers plus OpenAI-compatible endpoints
  • **Local execution**: runs in your browser, credentials stay local
  • **Free**: no subscription — pay only your LLM usage
  • **Apache-2.0**: fully open source

Setup

Install from the Chrome Web Store (free), add your LLM provider's API key in the extension settings, and describe the task. Source: github.com/nanobrowser/nanobrowser.

Prerequisites

Chrome/Chromium browser. An LLM provider API key.

Use cases

browser agentsweb automationscrapingtesting

Works with

custom

Trust score — 8/10

/10 trustVerified

Scored 8/10 (verified tier, metrics-v1). Evidence: 14,077 GitHub stars (log-scaled vs catalog peers); last push 10d ago; 2 releases/12mo; 83 open issues. Manual review: OSS browser agent as Chrome extension (multi-agent, any LLM, local, privacy-focused), 14.1k stars, active; browser agents still brittle; scope its credentials. License: Apache-2.0.

★ 14,077 GitHub stars

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
7.8/10
Maintenance · recency, releases, issue load
7.5/10
Openness · license + docs
10.0/10
Manual review · sanity read + red-flag check
8.0/10
  • · 14,077 GitHub stars (log-scaled vs catalog peers)
  • · last push 10d ago; 2 releases/12mo; 83 open issues
  • · manual review: OSS browser agent as Chrome extension (multi-agent, any LLM, local, privacy-focused), 14.1k stars, active; browser agents still brittle; scope its credentials

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.