---
title: "Kort vs SigmaOS: an honest comparison"
canonical: https://kortbrowser.com/vs/sigmaos
description: "Kort and SigmaOS side by side: what Kort adds, then engine, platforms, price, ad blocking, cookie pop-ups, usage data and AI. With sources and dates."
updated: 2026-11-01
language: en
---

# Kort vs SigmaOS

> Kort and SigmaOS side by side: what Kort adds, then engine, platforms, price, ad blocking, cookie pop-ups, usage data and AI. With sources and dates.

SigmaOS is a Mac browser on WebKit, built around vertical workspaces. Its paid plans add the Airis assistant.

## Kort adds 6 things

- No AI in the browser
- AI Overviews hidden in search
- Cookie pop-ups answered for you
- No usage data, no account
- Pay once, no subscription
- Made in the EU
- iPhone and iPad app (coming)

## Scorecard

|  | Kort | SigmaOS |
| --- | --- | --- |
| Apple's WebKit engine | Yes | Yes |
| Ad blocker, built in and on | Yes | Yes |
| Cookie pop-ups answered | Yes | Not confirmed |
| No usage data sent | Yes | Not confirmed |
| No account needed | Yes | Not confirmed |
| No AI in the browser | Yes | No |
| Vertical tabs and Spaces | Yes | Yes |
| iPhone and iPad app | Coming | No |
| Made in the EU | Yes | Not confirmed |

"Not confirmed" means we could not check it in a primary source. Price: Kort $5 once; SigmaOS Pro $20 a month (US list prices).

## What both have

- The same WebKit engine.
- Vertical tabs and workspaces.
- Built-in ad blocker.
- Chrome Web Store extensions (many, not all).

## Side by side

|  | 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 € 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 |

SigmaOS: WebKit, made by SigmaOS (Not confirmed), on Mac. Facts about SigmaOS checked on 2026-11-01. Kort's price is shown in euros; [every currency](https://kortbrowser.com/pricing.md).

## 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.

## Sources

- <https://sigmaos.com/> (as 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.