Tabbit vs Atlas

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

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.

ChatGPT Atlas was OpenAI’s Chromium browser for the Mac, with ChatGPT beside every page and an agent mode. OpenAI shut it down on August 9, 2026, and points people to the ChatGPT desktop app and its Chrome extension.

The short answer

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

AtlasShut down

OpenAI shut Atlas down on August 9, 2026: it may not open, runs no agent tasks and gets no security updates

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

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

Tabbit vs Atlas
What	Tabbit	ChatGPT Atlas	Yab
Made by	Lumina Lab (LUMINALAB PTE. LTD., Singapore)	OpenAI	Serafim Korablev
Status	Updated	Shut down August 9, 2026	Updated
Runs on	Mac and Windows	Mac	Mac
Phone app	Only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned	None; Atlas was Mac only and shut down on Aug 9, 2026	Not yet
Price	Free with a weekly AI allowance; Pro $30/month	Shut down; it was free, with agent mode on paid ChatGPT plans	Free; its AI runs on your own Claude or ChatGPT plan
AI	An agent that works in pages, on its own AI service	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	a command line	No	MCP and a command line
Engine	Chromium	Chromium	WebKit
Tabs down the side	Yes	A setting	Yes
Spaces	Not stated	Not stated	Yes
Split View	Yes	Not stated	Yes
Extensions	Chrome Web Store	Chrome Web Store	Chrome Web Store
Ad blocker	Built in	Not stated	Built in
Open source	No	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. 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. Atlas put ChatGPT beside every page, with optional browser memories and, on paid plans, an agent mode; it no longer works.

Agents like Claude Code and CodexTabbit leads

Tabbit can be driven over a command line, through the Tabbit command line, with a skill for Codex, Claude Code and Cursor. Atlas has no MCP server or command line for outside agents.

Tabs and windowsTabbit leads

Tabbit has tabs down the side, Split View and folders in the sidebar. Atlas has tabs down the side as a setting and folders in the sidebar.

PriceTabbit leads

Tabbit: Free with a weekly AI allowance; Pro $30/month. Atlas: Shut down; it was free, with agent mode on paid ChatGPT plans.

Where it runsTabbit leads

Tabbit runs on Mac and Windows. Atlas runs on Mac. On a Mac, Tabbit needs macOS 13 or later and Atlas needs macOS 14.2 or later. On the phone, Tabbit: only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned. Atlas has no phone app: Atlas was Mac only and shut down on Aug 9, 2026.

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.

PrivacyTabbit leads

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. Atlas has no ad blocker of its own. Atlas summed up pages for browser memories and deleted the originals; training on browsing was off by default.

UpdatesTabbit leads

Tabbit is updated as usual. Atlas: OpenAI shut Atlas down on August 9, 2026: it may not open, runs no agent tasks and gets no security updates.

What their pages don’t lead with

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

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

ChatGPT Atlas

Shut down on August 9, 2026, with no more security updates
Was Mac only, on Apple silicon
Bookmarks, tabs and history had to be exported by hand
Agent mode needed a paid ChatGPT plan

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

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
August 9, 2026Atlas: Atlas shut down
July 9, 2026Atlas: OpenAI said it will sunset Atlas for the new ChatGPT desktop app
June 9, 2026Tabbit: Version 1.0 released after a 100-day public beta
October 21, 2025Atlas: Launched for macOS

Questions

Is Tabbit free?

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

Is ChatGPT Atlas free?

It no longer works. Shut down; it was free, with agent mode on paid ChatGPT plans.

Which has an AI agent, Tabbit or Atlas?

Both. 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. Atlas put ChatGPT beside every page, with optional browser memories and, on paid plans, an agent mode; it no longer works.

Which runs on Windows, Tabbit or Atlas?

Tabbit does. Atlas runs on Mac.

Do Tabbit and Atlas have phone apps?

On the phone, Tabbit: only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned. Atlas has no phone app: Atlas was Mac only and shut down on Aug 9, 2026.

Is ChatGPT Atlas shut down?

OpenAI shut Atlas down on August 9, 2026: it may not open, runs no agent tasks and gets no security updates.

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 Tabbit; an agent in your signed-in tabs like Tabbit’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

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

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.

it’s freeDownload