Compare
Kort vs SigmaOS
SigmaOS is a Mac browser on WebKit, built around vertical workspaces. Its paid plans add the Airis assistant.
Kort adds 6 things
you don't get in SigmaOS.
Side by sideKortSigmaOS
Apple's WebKit engineYesYes
- Kort:
- WebKit, Apple's engine (the same as Safari)
- SigmaOS:
- WebKit Source, 2026-11-01
Ad blocker, built in and onYesYes
- Kort:
- Built in and on by default. Blocked inside WebKit before the request is sent. No extension needed
- SigmaOS:
- Built-in ad blocker, also on the free tier Source, 2026-11-01
Cookie pop-ups answeredYesNot confirmed
- Kort:
- Answered for you: "Reject all" or "Only necessary", or hidden
- SigmaOS:
- Not confirmed. Last seen: Not confirmed Source, 2026-11-01
No usage data sentYesNot confirmed
- Kort:
- None. Crash reports only if you choose to e-mail them
- SigmaOS:
- Not confirmed. Last seen: Not confirmed Source, 2026-11-01
No account neededYesNot confirmed
- Kort:
- None. No sign-in
- SigmaOS:
- Not confirmed. Last seen: Likely needed for paid plans Source, 2026-11-01
No AI in the browserYesNo
- Kort:
- No AI. Google's AI Overviews hidden by default
- SigmaOS:
- Airis assistant, Look it up, Simplify Source, 2026-11-01
Vertical tabs and SpacesYesYes
- Kort:
- Vertical sidebar, Spaces, split view with up to four pages on Mac
- SigmaOS:
- Vertical workspaces Source, 2026-11-01
iPhone and iPad appComingNo
- Kort:
- Mac. iPhone and iPad coming to the App Store
- SigmaOS:
- Mac only Source, 2026-11-01
Made in the EUYesNot confirmed
- Kort:
- Made in the EU
- SigmaOS:
- SigmaOS (Y Combinator company) Source, 2026-11-01
- Yes
- Partly or opt-in
- No
- Not confirmed
- Coming
What Kort adds
- YesNo AI in the browser
- YesAI Overviews hidden in search
- YesCookie pop-ups answered for you
- YesNo usage data, no account
- YesPay once, no subscription
- YesMade in the EU
- ComingiPhone and iPad appComing
Both Kort and SigmaOS
- The same WebKit engine
- Vertical tabs and workspaces
- Built-in ad blocker
- Chrome Web Store extensions (many, not all)
- Kort, once$5
- SigmaOS Pro, 1 year$240
- SigmaOS Pro, 3 years$720
Free tier. Pro $20 and Max $30 a month. Source, 2026-11-01.
Questions
Kort and SigmaOS both use WebKit. What differs?
SigmaOS offers an AI assistant on monthly plans. Kort has no AI and is a one-time purchase, with an iPhone and iPad app coming.
Every fact, word for wordChecked 2026-11-01
| Kort | SigmaOS | |
|---|---|---|
| Engine on Mac | WebKit, Apple's engine (the same as Safari) | WebKit |
| Platforms | Mac. iPhone and iPad coming to the App Store | Mac only |
| Made by | Made in the EU | SigmaOS (Y Combinator company) |
| Price and business model | 5 €$5£4.99CHF 559 kr59 kr39 kr22,99 zł129 Kč2 490 Ft once, no subscription. One license per iCloud account. | Free tier. Pro $20 and Max $30 a month |
| Ad and tracker blocking | Built in and on by default. Blocked inside WebKit before the request is sent. No extension needed | Built-in ad blocker, also on the free tier |
| Cookie pop-ups | Answered for you: "Reject all" or "Only necessary", or hidden | Not confirmed. Last seen: Not confirmed |
| Usage data | None. Crash reports only if you choose to e-mail them | Not confirmed. Last seen: Not confirmed |
| Account | None. No sign-in | Not confirmed. Last seen: Likely needed for paid plans |
| AI features | No AI. Google's AI Overviews hidden by default | Airis assistant, Look it up, Simplify |
| Vertical tabs and spaces | Vertical sidebar, Spaces, split view with up to four pages on Mac | Vertical workspaces |
Facts about SigmaOS checked on 2026-11-01.
Sources1 links
- sigmaos.comas of 2026-11-01
We describe other browsers from their own pages, help centers, app store listings and press coverage. Products change. If something here is out of date, write to us and we will fix it.
Other comparisons
Try Kort on your Mac
5 €$5£4.99CHF 559 kr59 kr39 kr22,99 zł129 Kč2 490 Ft, once. No subscription. macOS 15.4 or later. iPhone and iPad: coming to the app store.
Direct file: /download/Kort.dmg