An agent inside the browser you have

BrowserOS neo vs the Kimi Browser Extension

The closest thing to neo on this site. Both are local and work with any agent, so the question is whose window.

The Kimi Browser Extension, formerly Kimi WebBridge, is a Chrome and Edge extension from Moonshot paired with a local bridge service. It drives the browser over the DevTools Protocol, uses the sessions you are already signed into, keeps the work on your machine, and supports Kimi Code, Claude Code, Cursor, Codex, Hermes and OpenClaw.

BrowserOS neo starts from the same principles and draws the line in a different place. It is a browser dedicated to agents, signed in as you after a one-click import, with tab isolation, a cockpit and a replay of every run, and nothing installed into the browser you use yourself.

[ 01 ]

The short version

Choose BrowserOS neo when

You want agents out of the window you are working in.
Several agents should run at once without competing for one browser.
You want a replay of every run rather than a chat transcript.
An agent should not be able to close the document you are writing.

Choose the Kimi Browser Extension when

You are not going to install a second browser, and that is final.
You want your existing profile, with nothing to import.
You are on Edge, which neo does not ship for.
Kimi Code is your agent and you want the first-party path.

[ 02 ]

Side by side

BrowserOS neo compared with the Kimi Browser Extension, row by row.
Dimension	BrowserOS neo	the Kimi Browser Extension
What you install	BrowserOS neoA browser, beside the one you already use.	the Kimi Browser ExtensionAn extension plus a local bridge service. Nothing new to keep open.
Which agents work with it	BrowserOS neoAny MCP agent.	the Kimi Browser ExtensionKimi Code, Claude Code, Cursor, Codex, Hermes and OpenClaw. Agent-agnostic, the same as neo.
Where the work runs	BrowserOS neoYour machine.	the Kimi Browser ExtensionYour machine. Local-first by design, the same as neo.
Whose window	BrowserOS neoIts own. Agents cannot reach the tab you are using.	the Kimi Browser ExtensionThe Chrome or Edge you are already in.
Logged-in sites	BrowserOS neoImported once into a profile kept for agents.	the Kimi Browser ExtensionThe sessions you are already signed into, with nothing to import.
Browsers	BrowserOS neoIts own Chromium build.	the Kimi Browser ExtensionChrome and Edge.
Seeing what happened	BrowserOS neoLive cockpit and a scrubbable replay, on by default.	the Kimi Browser ExtensionYour agent’s transcript.

Two rows on this table say the same thing for both products, and that is the point. Local, and works with whatever agent you already run. Against every other tool here those are our arguments; against the Kimi extension they are common ground.

What is left is whose window. the Kimi extension borrows yours, which is why there is nothing to install or import. neo gives agents their own, which is why there is. Everything else follows from that one decision.

[ 03 ]

Same principles, and we did not stop at the extension.

Kimi and neo agree on the parts most rivals get wrong: local execution, your real sessions, any agent you like. Agreement is where the argument starts, not where it ends.

Working inside the browser you are using puts a ceiling on all three. Agents share your window, so they can reach the tab you are typing in. One browser means one at a time in practice. And there is no record beyond the agent’s own transcript.

neo takes the same principles further and gives agents a browser of their own: own tabs, several at once, a cockpit showing each, and a replay of every session. Nothing you are working on is reachable.

[ 04 ]

Common questions

Does the Kimi Browser Extension only work with Kimi?

No. Moonshot documents it for Kimi Code, Claude Code, Cursor, Codex, Hermes and OpenClaw, so it is agent-agnostic in the same way neo is.

Is the Kimi Browser Extension local?

Yes. It pairs the extension with a local bridge service and drives the browser over the DevTools Protocol, keeping sessions on your machine.

Why install a browser when an extension exists?

For isolation and observability. the Kimi extension works in the window you are using; neo gives agents their own tabs, runs several at once, and records every session for replay.

Does BrowserOS neo work on Edge?

No. neo is its own Chromium build. the Kimi extension supports Chrome and Edge, so on Edge it is the only one of the two that applies.

[ 05 ]

Check it yourself

Every claim about the Kimi Browser Extension here was read off these pages on 16 September 2026. If something has gone stale, tell us.

What we could not confirm

We could not confirm whether the Kimi Browser Extension is open source, so we make no claim either way.
We could not confirm whether a Kimi account or subscription is required when driving it with a non-Kimi agent.
We have not run the Kimi extension ourselves; the supported-agent list and local-first behaviour come from Moonshot’s documentation.

[ 06 ]

Other comparisons

Give your agent a browser it can sign into.

Free, open source, and it sits beside the browser you already use.