Open source AI browser
The Open Source AI Browser
Free, local, and private. BrowserOS is the open-source AI browser: an alternative to closed AI browsers like Perplexity Comet, ChatGPT Atlas and Dia that you can read, audit and run on your own machine.
What is an open source AI browser?
An open source AI browser is a web browser with AI built in whose source code is public, so anyone can read, audit, self-host and modify it. BrowserOS is that browser: free and open source under AGPL-3.0, running locally on your own machine, with your own model keys. Most AI browsers, including Perplexity Comet, ChatGPT Atlas and Dia, are closed source.
Two open-source AI browsers
BrowserOS comes in two forms. Both are free and open source under AGPL-3.0.
BrowserOS neo
The Browser for your Agents
A browser your existing agent drives over MCP: Claude Code, Cowork, Codex, Cursor and others. Signed in as you, runs locally, every session replayable. macOS and Windows.
BrowserOS
The browser for Humans with built-in AI
A privacy-first Chromium browser with AI agents built in. Describe a task in plain language and it clicks, types and navigates for you. macOS, Windows and Linux.
The open-source alternative to closed AI browsers
The best-known AI browsers are closed source, and some are Mac-only or put their agent behind a paid plan. Here is how BrowserOS compares.
| BrowserOS | Perplexity Comet | ChatGPT Atlas | Dia | |
|---|---|---|---|---|
| Open source | Yes, AGPL-3.0 | No | No | No |
| Price | Free | Free, paid tiers | Free, agent mode paid | Free, paid tier |
| Runs locally | Yes | Browser local, AI cloud | Browser local, AI cloud | Browser local, AI cloud |
| Platforms | macOS, Windows, Linux | Windows, macOS, mobile | macOS first | macOS |
| Bring your own model | Yes | No | No | No |
Competitor details are summarised here and sourced on each comparison page. Facts change; see the linked pages for the checked date and sources.
Why open source matters for an AI browser
Auditable
An AI browser acts on your accounts. With open source you can read exactly what it does, and every session is watchable and replayable.
Local and private
Your logins, screenshots and replays stay on your machine. Bring your own model keys, or run a local model.
No lock-in
AGPL-3.0, source on GitHub. Self-host, fork, or build from source. You are not tied to one vendor's model or cloud.
Built for the AI era
13 AI providers, 53 built-in browser tools, and 40+ app integrations over MCP. Backed by Y Combinator, open source top to bottom.
Open source AI browser FAQ
What is an open source AI browser?
An open source AI browser is a web browser with AI built in whose source code is public, so anyone can read, audit, self-host and modify it. BrowserOS is that browser: free and open source under AGPL-3.0, running locally on your own machine, with your own model keys. Most AI browsers, including Perplexity Comet, ChatGPT Atlas and Dia, are closed source.
Is there an open source AI browser?
Yes. BrowserOS is an open-source AI browser under the AGPL-3.0 license, with its source on GitHub. It comes in two forms: BrowserOS, the browser you drive yourself with AI agents built in, and BrowserOS neo, the browser your own AI agents drive. Both are free and run locally.
What is the difference between BrowserOS and BrowserOS neo?
BrowserOS is the daily-driver browser you use yourself, a privacy-first Chromium fork with AI agents built in, on macOS, Windows and Linux. BrowserOS neo is a separate browser your AI agents drive over MCP (Claude Code, Cowork, Codex, Cursor and others), on macOS and Windows. Both are open source.
Is there an open source alternative to Perplexity Comet, ChatGPT Atlas or Dia?
Yes. Comet, Atlas and Dia are closed source. BrowserOS is the open-source alternative: free, local, and you can read and audit every line. See the side-by-side comparisons for each.
Why does open source matter for an AI browser?
An AI browser acts on your accounts and reads your pages, so being able to see exactly what it does matters. Open source means you can audit the code, run it locally without sending your data to a vendor, avoid lock-in, and verify what the agent did. Security researchers have noted that AI browsers are susceptible to prompt injection, which is easier to reason about when the browser is open and every session is watchable and replayable.
Is BrowserOS really free?
Yes. Both BrowserOS and BrowserOS neo are free and open source under AGPL-3.0. You bring your own AI provider keys, or run a local model.