BrowserOS vs Tabbit

We make Yab, the third column.facts checked Oct 9 ↓

BrowserOS is an open-source Chromium agent browser for Mac, Windows and Linux. Its agent runs on the AI you connect: an API key, a ChatGPT or Copilot plan, Claude Code or Codex, or a local model.

Tabbit is a free Chromium AI browser for Mac and Windows from Lumina Lab in Singapore, with chat, an agent mode and a choice of many vendors’ models.

The short answer

Pick BrowserOS

if you want an open-source agent browser on your own AI keys or local models
if you want Claude Code, Codex or Cursor to drive a signed-in browser over MCP
if you use Linux

Pick Tabbit

if you want a free agent browser with a wide choice of models, Chinese ones included
if you want the same AI browser on Windows and Mac
if you want Codex or Claude Code to use your signed-in sessions through its command line

Or Yabours

if you miss Arc and want spaces, pins and folders kept, on a Mac
if you already pay for Claude or ChatGPT and want it to work in your signed-in tabs
if you want Claude Code, Codex or Cursor to drive a real browser over MCP

At a glance

BrowserOS and Tabbit, with Yab beside them for a Mac.

BrowserOS vs Tabbit
What	BrowserOS	Tabbit	Yab
Made by	Felafax, Inc.	Lumina Lab (LUMINALAB PTE. LTD., Singapore)	Serafim Korablev
Status	Updated	Updated	Updated
Runs on	Mac, Windows and Linux	Mac and Windows	Mac
Phone app	None; desktop only, and no Android plans as of May 2026	Only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned	Not yet
Price	Free and open source; you pay your own AI provider	Free with a weekly AI allowance; Pro $30/month	Free; its AI runs on your own Claude or ChatGPT plan
AI	An agent that works in pages, on its own AI or yours	An agent that works in pages, on its own AI service	An agent that works in pages, on your Claude or ChatGPT plan
Driven by outside agents	MCP and a command line	a command line	MCP and a command line
Engine	Chromium	Chromium	WebKit
Tabs down the side	Yes	Yes	Yes
Spaces	No	Not stated	Yes
Split View	Yes	Yes	Yes
Extensions	Chrome Web Store	Chrome Web Store	Chrome Web Store
Ad blocker	No	Built in	Built in
Open source	Yes	No	No

Checked October 9, 2026 on each maker’s own pages, linked under Sources. Prices are per month, in US dollars.

Where they differ

What separates them, area by area. Where one plainly has more, it says who; where it comes down to taste, it says so.

AIa matter of taste

Both have an agent that works in your pages. BrowserOS’s agent, in the new tab and side panel, clicks, types, fills forms and pulls out data, on the AI you connect. Tabbit chats with your tabs, files and screenshots, and its agent mode runs multi-step tasks in tab groups of its own, on GPT, Claude, Gemini, DeepSeek, Kimi, Qwen or GLM.

Agents like Claude Code and CodexBrowserOS leads

BrowserOS can be driven over MCP and a command line, through a built-in MCP server with one-click setup for Claude Code, Codex and Cursor, and a command line. Tabbit can be driven over a command line, through the Tabbit command line, with a skill for Codex, Claude Code and Cursor.

Tabs and windowseven

Both have tabs down the side, Split View and folders in the sidebar.

PriceBrowserOS leads

BrowserOS: Free and open source; you pay your own AI provider. Tabbit: Free with a weekly AI allowance; Pro $30/month.

Where it runsBrowserOS leads

BrowserOS runs on Mac, Windows and Linux. Tabbit runs on Mac and Windows. On a Mac, Tabbit needs macOS 13 or later. BrowserOS has no phone app: desktop only, and no Android plans as of May 2026. On the phone, Tabbit: only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned.

Engine and extensionsa matter of taste

Both are built on Chromium, as Chrome is, so sites work as they do in Chrome. Both take extensions from the Chrome Web Store.

Privacyeven

BrowserOS has open code. BrowserOS sends prompts and pages only to the AI you connect, or keeps them local with Ollama or LM Studio; it sends anonymous usage analytics. Tabbit has an ad blocker built in. Tabbit sends prompts and pages you share to the model vendor you pick, on servers in Singapore or your region; its maker says it doesn’t train on your data.

What their pages don’t lead with

Real limits, from the makers’ own words and our own use.

BrowserOS

No built-in model since version 0.51: connect a provider before the agent works
Its own docs say local models are too weak for agent tasks
Before 1.0 and changing fast: Skills and Memory were pulled in June 2026
No phone apps

Tabbit

Top models and heavy agent use need Pro at $30 a month
The free AI is a weekly allowance, larger only if Tabbit is your default browser
No Linux or phone apps yet
No MCP server documented, only its command line

Yab, honestly

Mac only: macOS 15.4 or later, no Windows, iPhone or Android
New: first released in September 2026
Its AI needs a Claude or ChatGPT plan; ChatGPT’s free plan may work with low limits
WebKit, as in Safari: a site tested only in Chrome can misbehave
Closed source

What changed lately

October 5, 2026BrowserOS: Built-in model and account sign-in removed; Chromium 155 (0.51.0)
September 8, 2026Tabbit: Tabbit CLI lets coding agents drive the browser with your logins
August 21, 2026Tabbit: Version 1.11 dropped macOS 12; macOS 13 or later required
June 17, 2026BrowserOS: Claude Code and Codex built into the agent; Skills and Memory removed (0.46.0)
June 9, 2026Tabbit: Version 1.0 released after a 100-day public beta
March 9, 2026BrowserOS: Vertical tabs became the default (0.42.0)

Questions

Is BrowserOS free?

Yes. Free and open source; you pay your own AI provider.

Is Tabbit free?

Yes, with limits on its AI. Free with a weekly AI allowance; Pro $30/month.

Which has an AI agent, BrowserOS or Tabbit?

Both. BrowserOS’s agent, in the new tab and side panel, clicks, types, fills forms and pulls out data, on the AI you connect. Tabbit chats with your tabs, files and screenshots, and its agent mode runs multi-step tasks in tab groups of its own, on GPT, Claude, Gemini, DeepSeek, Kimi, Qwen or GLM.

Do BrowserOS and Tabbit run on Windows?

Yes, both. BrowserOS runs on Mac, Windows and Linux; Tabbit on Mac and Windows.

Do BrowserOS and Tabbit have phone apps?

BrowserOS has no phone app: desktop only, and no Android plans as of May 2026. On the phone, Tabbit: only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned.

Is there a third option on a Mac?

Yab, Yet Another Browser, is free for the Mac: tabs down the side with spaces, folders and Split View, as in BrowserOS; an agent in your signed-in tabs like BrowserOS’s, on the Claude or ChatGPT plan you already pay for. Claude Code, Codex and any MCP client can drive it too. It runs on WebKit, the engine Safari uses, and takes Chrome extensions. It is Mac only, and new.

More comparisons

BrowserOS vs Dia BrowserOS vs Comet BrowserOS vs Atlas BrowserOS vs Opera Neon BrowserOS vs Chrome BrowserOS vs Safari BrowserOS vs Edge BrowserOS alternatives Yab vs BrowserOS Tabbit vs Dia Tabbit vs Comet Tabbit vs Atlas Tabbit vs Opera Neon Tabbit vs Chrome Tabbit vs Safari Tabbit vs Edge Tabbit alternatives Yab vs Tabbit

Sources, read October 9, 2026. Something out of date? Write to hello@serafimlabs.io and we fix it.

Yab, Yet Another Browser.

Free for the Mac. Arc’s sidebar, your own Claude or ChatGPT as the agent, Chrome extensions on WebKit.

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