What is Nanobrowser?
Nanobrowser is an open-source Chrome extension, licensed under Apache 2.0, that runs multi-agent AI workflows in the browser to automate web tasks from natural-language instructions. It's pitched as a free alternative to OpenAI Operator, and users bring their own LLM API key, from providers such as OpenAI, Anthropic, Gemini, Ollama, Groq, Cerebras, and Llama, or a custom OpenAI-compatible endpoint. It's distributed through the Chrome Web Store with no subscription fees, and its GitHub repository has around 13.5k stars and 368 commits.
Our verdict
Nanobrowser fits users who want browser-based task automation without a hosted subscription and are willing to supply and pay for their own LLM API key. There is no disclosed funding or third-party coverage, so its reliability at scale rests on the open-source project itself rather than any outside validation.
Categories:
Agentic automation tools give an LLM control of a browser to navigate, click, and fill forms toward a goal, rather than following a fixed script. They are newer and less predictable than selector-based scraping, but they handle sites and workflows that are hard to hardcode.
