Nanobrowser

nanobrowser/nanobrowser

Multiple AI agents operate web pages in your Chrome — comparing prices, filling forms, gathering data — using your own LLM API key.

Why pick itSimilar to OpenAI Operator or Comet, but fully open source and running in your local browser, so your logged-in sessions never go to a cloud service.

Install

InstallChrome Web Store: search “Nanobrowser”

GitHub: nanobrowser/nanobrowser
Website: nanobrowser.ai
Stars: ★ 14.2k
License: Apache-2.0
Language: TypeScript
Last push: Oct 24, 2026
Category: Browser extensions

Good for

Describe a task in plain words in the side panel and let the agent read pages, click, type and switch tabs
Run several tasks at once, each in its own tab group
Save results such as a CSV table or Markdown report to your Downloads folder
Save frequent prompts as shortcuts and start them by typing /

Getting started

Search for "Nanobrowser" in the Chrome Web Store and install it
Pick a cloud provider and enter your own API key in settings, or connect a local model
Open the side panel and describe a task; set sites to Allow, Ask or Block under Settings → Permissions if needed

Before you install

Supports Chrome and Edge; other browsers are untested. In the default Ask mode it asks before submitting, sending, deleting or uploading, and always hands payments and passwords to you. It sends anonymous daily usage counts that never include pages.

Summarized by AI from the project docs; check the official docs before relying on it.

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