SigmaOS

A Mac browser that organises tabs into workspaces, with a built-in AI assistant.

Verified facts: 4 of 4
Alternatives ranked: 3
Approved reviews: 0
Visits sent from here: 0

About SigmaOS

SigmaOS is a WebKit-based browser for macOS that treats tabs like a to-do list. Tabs sit in a vertical sidebar grouped into workspaces, which work like separate rooms for projects, and you can mark tabs done, snooze them, split the view and switch between logins. It added an AI companion called Airis that can answer questions about the page you're on, explain passages and help find things in your own words. Because it is built on WebKit, it is efficient on Apple hardware, but it supports fewer extensions than Chromium browsers and some sites behave as they do in Safari. It is made by a small startup, so its long-term future is less certain than that of browsers backed by large companies. The browser is free to download. It runs only on macOS. It suits Mac users who like Arc-style workspaces and want a lighter, WebKit-based alternative.

Best for: Mac users who want tab workspaces in a lightweight WebKit browser.

What works

Workspaces with tabs managed like a to-do list
Efficient WebKit engine
Built-in AI help on the current page

Why people leave

Mac only
Limited extension support
Small startup behind it

Top SigmaOS alternatives

See all 3

1
Dia
Arc's successor with profiles, sidebar tabs and AI, on Mac and Windows.
62.6
2
Orion
Another efficient WebKit browser for Mac, with broad extension support.
59.6
3
Zen Browser
Open-source workspace browser on Firefox, across all desktops.
57.2

Why people left SigmaOS

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

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SigmaOS: common questions

Is SigmaOS free?

Yes, SigmaOS is free to use.

Is SigmaOS open source?

No, SigmaOS is not open source. Open-source alternatives include Zen Browser.

What platforms does SigmaOS run on?

SigmaOS is available for macOS.

What are the best alternatives to SigmaOS?

The highest-ranked SigmaOS alternatives right now are Dia, Orion and Zen Browser. See the full ranked list for pricing, platforms and verified facts.

See all 3 SigmaOS alternatives

SigmaOS facts

4 of 4 verified

Price: Free to download; Checked Oct 25, 2026sigmaos.com(opens source in a new tab); “Get SigmaOS Free It's free and super easy to set up”
Workspaces: Yes; Checked Oct 25, 2026sigmaos.com(opens source in a new tab); “Workspaces Like rooms in a house Your tabs are neatly organized and laid out in separate lists.”
AI assistant: Airis; Checked Oct 25, 2026sigmaos.com(opens source in a new tab); “Your browser companion, Airis, understands the website you're on to help you get to the information you need.”
Engine: WebKit; Checked Oct 25, 2026sigmaos.com(opens source in a new tab); “WebKit Like Safari Like Safari, SigmaOS uses the WebKit rendering engine under the hood.”