Yalqen
Dia is the browser The Browser Company moved on to after Arc. It opened to everyone on macOS in October 2025, the same month Atlassian completed its purchase of the company, and its centre is an AI assistant that works with your open tabs.
Yalqen is a smaller, open-source browser for web developers on the Mac. It has no AI assistant and no account, and puts vertical tabs, a command bar and developer tools first.
Is Yalqen more private than Dia?
What each browser does out of the box, before you change a setting.
- Blocks ads
- Blocks trackers
- Works without an account
- Keeps pages away from AI providers
- Open source
How do the features compare?
- Vertical tabs
- Command bar with developer commands
- AI assistant
- Chrome Web Store extensions
- Sync between devices
What Yalqen does differently
- Open source under the MIT license. Dia is closed source.
- No account. Dia asks you to create one before you start browsing.
- No AI assistant and nothing sent to AI providers. Dia sends your question and the page context it needs through its servers to AI partners.
- Developer tools built in: phone view with device presets, network throttling, request rules, user-agent switching and screenshots.
- A keyboard-first command bar on ⌘L that searches, jumps to tabs and history, and runs commands by name.
Where Dia is ahead
- Dia has an AI assistant that can read, summarise and act on your tabs. Yalqen has none.
- Dia syncs profiles, bookmarks, tabs and settings between devices. Yalqen has no sync yet.
- Dia is backed by a funded company with a weekly release cadence, and a Windows version is in development.
- Dia supports Chrome extensions more completely than Yalqen does.
Yalqen and Dia side by side
| Topic | Yalqen | Dia |
|---|---|---|
| Source code | Open source (MIT) | Proprietary |
| Engine | Chromium, through Electron | Chromium |
| Platforms | macOS 13+ on Apple silicon | macOS 14+ on Apple silicon; Windows waitlist |
| Vertical tabs | Default layout | Optional sidebar |
| AI assistant | None | Built in |
| Account | None needed | Required |
| Ad blocking | Built in, on by default | Built in, on by default |
| Extensions | Chrome Web Store, with limits | Chrome Web Store, Manifest V3 only |
| Sync | Not yet | Yes, end-to-end encrypted |
| Price | Free | Free tier; Dia Pro $20 a month |
Questions about Yalqen and Dia
Does Yalqen have an AI assistant?
No. Nothing you browse is sent to an AI provider.
Do I need an account?
Not for Yalqen. Dia asks you to create one before you start browsing.
Can I use Chrome extensions in both?
Yes. Both install from the Chrome Web Store, and Dia supports more of them than Yalqen does today.
Does Yalqen sync between devices?
Not yet. Dia syncs profiles, bookmarks, tabs and settings.
Try it next to Dia
Yalqen does not need to replace your current browser to be worth a try. Install it, learn the keyboard shortcuts and see whether the layout suits you. Missing something? Open an issue, and see what is coming on the roadmap.
Other comparisons: 
Arc · 
Chrome · 
Brave · 
Zen · 
Orion · 
Firefox
Sources: Dia release notes, The Browser Company · Dia security and privacy, The Browser Company · Dia browser status tracker, SupaSidebar