Verified project record

nanobrowser/nanobrowser

An open-source Chrome extension that uses multiple specialized AI agents to automate web tasks through natural language. It supports flexible LLM choices including local models, providing a cost-free alternative to subscription-based browser automation services.

Project overview

Project type: AI Agent
Use cases: Automation
Deployment: Refer to project documentation
License: Apache-2.0

Best for

Users seeking a free, open-source alternative to automate repetitive browser tasks while paying only for their own API usage.
Privacy-focused users who prefer to run models locally and keep their credentials within their own browser environment.

Key capabilities

Uses specialized AI agents that collaborate to accomplish complex web workflows.
Provides an intuitive chat interface with real-time status updates for ongoing tasks.
Enables users to easily access and manage their AI agent interaction history.
Allows users to connect preferred LLM providers and assign different models to different agents.
Automates repetitive web tasks across websites using natural language instructions.
Supports running models locally via Ollama or custom OpenAI-compatible providers to achieve zero API costs and complete privacy.

Limitations and risks

Firefox, Safari, and other Chromium variants such as Opera and Arc are not supported.
Local models require more specific and cleaner prompts, as they may struggle with ambiguous commands.
Third-party derivative projects involving cryptocurrencies, tokens, or NFTs based on this codebase are unaffiliated; users interact with them at their own risk.
Using cost-effective local model configurations may produce less stable outputs and require more task iterations.

Getting started

Install the extension from the Chrome Web Store by clicking the Add to Chrome button.
Load the unpacked extension folder into the browser; this requires no coding skills.
Configure the Agent Models by adding your LLM API keys or local model endpoints to supply intelligence for the Planner and Navigator agents.

Evidence and sources

GitHub project description: Open-Source Chrome extension for AI-powered web automation. Run multi-agent workflows using your own LLM API key. Alternative to OpenAI Operator.
README: Nanobrowser is an open-source AI web automation tool that runs in your browser. A free alternative to OpenAI Operator with flexible LLM options and multi-agent system.
README: Looking for a powerful AI browser agent without the $200/month price tag of OpenAI Operator? **Nanobrowser** , as a chrome extension, delivers premium web automation capabilities…
README: all running locally in your browser.
README: We're actively developing Nanobrowser with exciting features on the horizon, welcome to join us!

Reviewed at: 2026-07-18T00:04:50Z