YabDia 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.
Opera One is Opera’s free Chromium browser on every desktop and phone, with a free browser VPN, an ad blocker, messengers in the sidebar and Opera AI. Its agents are in a separate browser, Opera Neon.
The short answer
- 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 want a free browser VPN and an ad blocker built in
- if you keep WhatsApp, Telegram or Slack open in a sidebar
- if you sort work into workspaces, Tab Islands and split screen
- 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
Dia and Opera, with Yab beside them for a Mac.
| What | Dia | Opera | Yab |
|---|---|---|---|
| Made by | The Browser Company (Atlassian) | Opera | Serafim Korablev |
| Status | Updated | Updated | Updated |
| Runs on | Mac and Windows | Mac, Windows, Linux, iPhone and Android | Mac |
| Phone app | None | iPhone, iPad and Android; syncs tabs, bookmarks and Speed Dials with an Opera account | Not yet |
| Price | Browser free; AI on Better Answers $20/month or Better Days $100/month | Free, with Opera AI and a browser VPN; VPN Pro is paid | Free; its AI runs on your own Claude or ChatGPT plan |
| AI | Chat about 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 | No | MCP | MCP and a command line |
| Engine | Chromium | Chromium | WebKit |
| Tabs down the side | A setting | A setting | Yes |
| Spaces | Yes | 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.
AIa matter of taste
Both have AI to ask about pages, and neither does the clicking for you. 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. Opera AI answers about the page, Tab Islands, videos and files, and makes images, with no account; it doesn’t click or fill forms.
Agents like Claude Code and CodexOpera leads
Dia has no MCP server or command line for outside agents. Opera can be driven over MCP, through Browser Connector, in early testing, which lets ChatGPT or Claude read and open tabs but not click or type.
Tabs and windowseven
Both have tabs down the side as a setting, spaces, Split View, folders in the sidebar and tabs that sleep.
PriceOpera leads
Dia: Browser free; AI on Better Answers $20/month or Better Days $100/month. Opera: Free, with Opera AI and a browser VPN; VPN Pro is paid.
Where it runsOpera leads
Dia runs on Mac and Windows. Opera runs on Mac, Windows, Linux, iPhone and Android. On a Mac, Dia needs macOS 14 or later. Dia has no phone app. On the phone, Opera: iPhone, iPad and Android; syncs tabs, bookmarks and Speed Dials with an Opera account.
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.
PrivacyOpera leads
Dia has an ad blocker built in. 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. Opera has an ad blocker built in and a VPN. Opera AI sends only the current page or Tab Island when you write with page access on; Opera says it doesn’t send your history.
What their pages don’t lead with
Real limits, from the makers’ own words and our own use.
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
Opera
- Opera AI only chats and sums up; agents need Opera Neon at $19.90 a month
- The free VPN covers the browser only, with three locations
- The ad blocker is off until you turn it on
- Browser Connector is in early testing and needs an Opera account
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
- August 17, 2026Dia: Paid AI plans started rolling out to new Mac users
- July 23, 2026Opera: Vertical tabs shipped to all Opera One users
- April 16, 2026Opera: Browser Connector lets ChatGPT and Claude read your tabs over MCP (Early Bird)
- December 11, 2025Opera: Opera AI replaced Aria in Opera One, GX and Air
- October 21, 2025Dia: Atlassian completed its acquisition of The Browser Company
Questions
Is Dia free?
The browser is; its AI isn’t. Browser free; AI on Better Answers $20/month or Better Days $100/month.
Is Opera free?
Yes. Free, with Opera AI and a browser VPN; VPN Pro is paid.
Which has an AI agent, Dia or Opera?
Neither has an agent that does tasks in your pages. 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. Opera AI answers about the page, Tab Islands, videos and files, and makes images, with no account; it doesn’t click or fill forms.
Do Dia and Opera run on Windows?
Yes, both. Dia runs on Mac and Windows; Opera on Mac, Windows, Linux, iPhone and Android.
Do Dia and Opera have phone apps?
Opera does. Dia has no phone app. On the phone, Opera: iPhone, iPad and Android; syncs tabs, bookmarks and Speed Dials with an Opera account.
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 Dia; an agent that works in your signed-in tabs, 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
- 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)
- Opera blog: Opera AI comes to Opera One, GX and Air
- Opera AI feature page
- Opera blog: Browser Connector
- Opera press: Browser Connector (2026-04-16)
- Opera blog: Opera 133 stable, vertical tabs (2026-07-23)
- Opera blog: how vertical tabs work
- Opera blog: Opera One R3
- Opera blog: new native ad blocker (2026-05-14)
- Opera free VPN page
- Opera Workspaces page (split screen, messengers)
- Opera Help: features (tab snoozing, messengers, workspaces)
- Opera Help: security and privacy (ad blocker, VPN)
- Opera Help: Password Manager
- Opera Help: import browsing data
- Opera Help FAQ: Chrome Web Store extensions
- Opera system requirements
- Opera Neon subscription
- Opera blog: Neon free plan for outside agents (2026-08-14)
- Opera blog: Opera One for iOS brings full synchronization (Jul 9, 2026)
- Opera: Sync your Opera browsers
- Opera: Flow / My Flow
- Opera Help (iOS): Connect your computer and phone with Flow
- Opera Browser with VPN on the App Store (iPhone and iPad)
- Opera: Private Web Browser on Google Play
- 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.