YabTabbit vs Dia
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.
Dia is the AI browser The Browser Company builds now instead of Arc. It is Chromium-based, for Macs with Apple silicon and, since October 2026, Windows, and its AI chats with your tabs and the tools you connect.
The short answer
- 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
- if you want the current browser from Arc’s makers, with Arc import and tabs down the side as a setting
- if you want AI that chats across your tabs, Gmail, Slack and Notion, and will pay for it
- if you want a free browser with an ad blocker and no AI
- 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 Dia, with Yab beside them for a Mac.
| What | Tabbit | Dia | Yab |
|---|---|---|---|
| Made by | Lumina Lab (LUMINALAB PTE. LTD., Singapore) | The Browser Company (Atlassian) | Serafim Korablev |
| Status | Updated | Updated | Updated |
| Runs on | Mac and Windows | Mac and Windows | Mac |
| Phone app | Only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned | None | Not yet |
| Price | Free with a weekly AI allowance; Pro $30/month | Browser free; AI on Better Answers $20/month or Better Days $100/month | Free; its AI runs on your own Claude or ChatGPT plan |
| AI | An agent that works in pages, on its own AI service | Chat about 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 | Yes | Yes |
| Split View | Yes | Yes | Yes |
| Extensions | Chrome Web Store | Chrome Web Store | Chrome Web Store |
| Ad blocker | Built in | Built in | 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.
AITabbit leads
Only Tabbit has an agent that clicks, types and finishes tasks 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. Dia chats with your tabs and the tools you connect, like Gmail, Slack and Notion, and drafts mail and invites; there is no documented agent that works through sites.
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. Dia has no MCP server or command line for outside agents.
Tabs and windowseven
Tabbit has tabs down the side, Split View and folders in the sidebar. Dia has tabs down the side as a setting, spaces, Split View, folders in the sidebar and tabs that sleep.
PriceTabbit leads
Tabbit: Free with a weekly AI allowance; Pro $30/month. Dia: Browser free; AI on Better Answers $20/month or Better Days $100/month.
Where it runseven
Both run on Mac and Windows. On a Mac, Tabbit needs macOS 13 or later and Dia needs macOS 14 or later. On the phone, Tabbit: only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned. Dia has no phone app.
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
Both have 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. Dia’s chat goes through its servers to Anthropic, OpenAI and Google; chats and history stay on your Mac, and content sharing is on by default, kept 30 days.
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
Dia
- AI costs $20 or $100 a month for new users; the free plan has none after a 14-day trial
- On a Mac it needs Apple silicon and macOS 14 or later
- Its AI chats and drafts, but there is no documented agent that works through sites
- No MCP server or command line for outside agents
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 6, 2026Dia: Dia 1.0 for Windows released
- 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 17, 2026Dia: Paid AI plans started rolling out to new Mac users
- June 9, 2026Tabbit: Version 1.0 released after a 100-day public beta
- October 21, 2025Dia: Atlassian completed its acquisition of The Browser Company
Questions
Is Tabbit free?
Yes, with limits on its AI. Free with a weekly AI allowance; Pro $30/month.
Is Dia free?
The browser is; its AI isn’t. Browser free; AI on Better Answers $20/month or Better Days $100/month.
Which has an AI agent, Tabbit or Dia?
Tabbit. 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. Dia chats with your tabs and the tools you connect, like Gmail, Slack and Notion, and drafts mail and invites; there is no documented agent that works through sites.
Do Tabbit and Dia run on Windows?
Yes, both. Tabbit runs on Mac and Windows; Dia on Mac and Windows.
Do Tabbit and Dia have phone apps?
On the phone, Tabbit: only for its Chinese edition, in Chinese; tabbit.ai lists mobile as planned. Dia has no phone app.
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 home page and FAQ
- Tabbit membership plans
- Tabbit release notes (What’s New)
- Tabbit CLI quick start (2026-09-18)
- Tabbit quick start guide
- Tabbit privacy policy
- App Store: Tabbit by Beijing KuXun Interactive Technology, universal iPhone and iPad, Simplified Chinese only, first released Jun 5, 2026
- Xiaomi App Store: Tabbit Android app, com.tabbit.ai, v0.52.9, updated Oct 9, 2026
- Tabbit China site, mobile download page (links the App Store app)
- Tabbit China membership page: bookmarks, passwords and chats sync on macOS, Windows, iOS, Android, HarmonyOS
- Beijing News (Jun 9, 2026): Tabbit 1.0 launch, mobile testing begun
- Dia plans and pricing FAQ
- Dia home page (macOS and Windows, ad and tracker blocking)
- Dia changelog (Chromium M155, Windows 1.0, tab sleep, sidebar or top tabs, AppleScript, memory retired)
- Dia release notes 1.52.0 (Oct 8, 2026)
- Dia download FAQ (import from Chrome, Safari, Edge, Arc)
- Dia security (AI providers, retention, local storage)
- MacRumors: Dia generally available, macOS 14 and Apple silicon
- PiunikaWeb: Dia $20 and $100 plans (Aug 18, 2026)
- Atlassian completes acquisition (Oct 21, 2025)
- Dia home page: ’Available for macOS and Windows’
- PiunikaWeb: Dia ’iPhone Tabs’ menu spotted, no public app (2026-08-25)
- Yab Manual: Bringing in from another browser
- Yab Manual: Connecting Claude or ChatGPT
- Yab Manual: Extensions
- Yab Manual: Yab’s tools over MCP
- Yab Manual: Privacy
Yab, Yet Another Browser.
Free for the Mac. Arc’s sidebar, your own Claude or ChatGPT as the agent, Chrome extensions on WebKit.