Nanobrowser
AI web agent that runs in your browser — open source alternative to OpenAI Operator with flexible LLM options
| What is it | AI web agent that runs in your browser — open source alternative to OpenAI Operator with flexible LLM options |
|---|---|
| Pricing | Free |
| Free tier | Yes |
| Platform | Chrome Extension |
| Best for | automating repetitive web tasks, extracting data from websites |
| Domain registered | 2024 |
Data updated Aug. 1, 2026
What does Nanobrowser do?
Nanobrowser is an open-source Chrome extension that turns your browser into an AI-powered web agent. You give it a task — like filling out a form with data from a spreadsheet or extracting all product prices from a page — and it uses a large language model to figure out the steps and execute them automatically. It's essentially a free, self-hosted alternative to OpenAI's Operator.
Instead of relying on a single AI provider, Nanobrowser lets you choose which LLM to use — OpenAI, Anthropic, or others. You bring your own API key, so the tool stays flexible and respects your preferences. Since it runs entirely as a browser extension, all your sessions live in your own browser, giving you more control over privacy. The project is fully open source, meaning anyone can inspect the code, contribute improvements, or customize it to fit specific needs.
Nanobrowser is ideal for developers who need to automate tedious browser workflows, researchers scraping data from websites, or anyone who wants to offload repetitive clicking and typing to an AI. Because it's open and extensible, it's also a solid starting point for building custom automation pipelines. If you've been curious about AI web agents but didn't want to pay for a subscription or hand over control to a closed service, this is worth a try.
Key features
What makes it stand outWho is Nanobrowser for?
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