Nanobrowser

Nanobrowser is an open source Chrome extension that works as an AI web agent inside the browser. Instead of sending tasks to a hosted service, it runs multi agent workflows in the user's own browser session and uses the user's own LLM API key, so the model provider is the user's choice. The project positions itself as a flexible alternative to OpenAI Operator. The agent automates tasks on web pages, driven by instructions typed into the extension. Its site answers a short set of questions on what the tool is, why to use it, how to get started, which models are supported and how to contribute to the open source project. The site offers an Add to Chrome button for installation. It suits developers and power users who want browser automation without handing browsing activity to a closed hosted agent, and who are comfortable supplying and paying for their own model access. The site publishes no pricing page and no plan prices. Because the user supplies their own LLM API key, model usage is billed by the chosen provider.