Nanobrowser
An open-source Chrome extension that runs multi-agent AI web automation with your own LLM API key.
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About Nanobrowser
Nanobrowser is a Chrome extension that lets AI agents carry out tasks on websites for you, such as navigating pages and filling in steps of a multi-stage job. Several agents work together on a task inside your own browser.
You supply your own API key for a language model provider, so there is no Nanobrowser subscription. It is positioned as an open-source alternative to OpenAI Operator and suits people who want browser automation without a hosted agent service.
Strengths
- Runs inside your own browser
- Bring your own LLM API key
- Multi-agent workflows for multi-step tasks
Limitations
- Needs a paid API key from a model provider
- Chrome-focused
Details
- Pricing
- FreeFree and open source; you pay your chosen LLM provider for API usage.
- License
- Open source, license not stated
- Developer
- The Nanobrowser contributors
- Platforms
- Browser extension
- How it runs
- Browser extension
- Account
- Not required
- Works offline
- No
- Best suited for
- Automating web tasks with AI without a hosted agent subscription
- Categories
- Browser tools, Automation, AI agents
- Last verified
- Added
Alternatives to Nanobrowser
Compare allSoftware that can replace Nanobrowser for an important use case, and what changes if you switch.
HARPA AI
Chrome extension that brings several AI models and web automation to any page you visit.
HARPA AI is a freemium closed-source Chrome extension with browser automation plus summaries and a Gmail helper, supporting many AI providers and local models.
BrowserOS
An open-source Chromium-based browser with built-in AI agents that can run on local models.
BrowserOS is a full open-source Chromium browser with built-in agents that can run on local models, replacing the browser rather than adding an extension.
Perplexity Comet
Agentic browser with a built-in research assistant and task automation.
Perplexity Comet is a closed-source agentic browser for Windows and macOS that needs a Perplexity account instead of your own API key.
Fellou
A desktop web browser with a built-in AI agent that carries out multi-step tasks across websites.
Fellou is a closed-source desktop browser whose agent runs multi-step tasks across sites and shows an editable plan, relying on its own AI services.
Browser Use
Open source framework that lets AI agents control a web browser.
Browser Use is an MIT-licensed framework for letting agents control a browser, used from code or CLI rather than as a ready extension.
Opera Neon
Opera's agentic web browser that uses AI agents to research, manage tabs and act on web pages.
Opera Neon is a paid closed-source agentic browser with several agents and MCP connections, running on Windows and macOS.
ChatGPT Atlas
OpenAI's Chromium-based web browser with ChatGPT and an agent mode built into every page.
ChatGPT Atlas is OpenAI's closed-source macOS browser with an agent mode, tied to the ChatGPT service instead of your own model key.
Nanobrowser as an alternative
Listings that name Nanobrowser as an alternative.
Airtop
A service that turns plain-English workflow descriptions into scheduled AI agents working across apps, APIs and websites.
Nanobrowser is a free open-source Chrome extension that runs multi-agent web automation in your own browser, and it requires your own paid LLM API key.
Skyvern
Open-source AI agents that automate browser workflows such as logins, form filling and data extraction.
Nanobrowser is a free open-source Chrome extension running multi-agent web automation in your own browser with your own LLM API key.
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Related functionality, not necessarily a direct replacement.
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Steel
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Dia
AI-first browser with a chat sidebar that works across your tabs.
