Alternatives · Browsers
SigmaOS alternatives
As of Nov 12, 2026, the highest-graded SigmaOS alternative is Vivaldi (3.8 GPA). It's also the best free one.
SigmaOS compared with 5 alternatives: Arc, Zen Browser, Dia, Orion and Vivaldi.
SigmaOS has a free plan. Paid plans start at $20 per month (Pro). All 5 alternatives are free or have a free plan.
Listings checked up to Nov 12, 2026 · Where the facts come from
Black Friday: is there a SigmaOS sale?
At a glance
Price against what you get
SigmaOS starts at $20 a month and scores 1.7 out of 4 on features, ease of use and platforms. 5 of the 5 alternatives on this chart score higher and start lower: Arc, Zen Browser, Dia, Orion and Vivaldi.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
How each one differs from SigmaOS
Arc
Chromium-based browser with Spaces, Profiles and Split View
- Arc is free.
- Arc also lists Windows, iOS and Android apps.
- Arc does not cover ad and tracker blocking, which SigmaOS does.
Suits: People who keep work and personal browsing in one window
Zen Browser
Free, open-source desktop browser built around vertical tabs
- Zen Browser is free.
- Zen Browser also lists Windows and Linux apps.
- Zen Browser is open source, according to its own site.
- Zen Browser does not cover ad and tracker blocking, which SigmaOS does.
Suits: People who prefer vertical tabs and a minimal interface
Dia
AI browser for work that answers questions across tabs and tools
- Dia starts at $10 per month (Better Answers).
- Dia also lists a Windows app.
- Dia is end-to-end encrypted, according to its own site.
- Dia also covers chat assistant.
- Dia does not cover ad and tracker blocking, which SigmaOS does.
Suits: Mac and Windows users whose work is spread across Slack, Notion, Google Workspace and Teams
Orion
WebKit browser from Kagi that runs Chrome and Firefox extensions
- Orion starts at $5 per month, $50 per year or $150 lifetime, plus sales tax (Orion+).
- Orion also lists iOS and Linux apps.
- Orion also covers password manager.
- Orion does not cover ad and tracker blocking, which SigmaOS does.
Suits: Apple users who want Chrome and Firefox extensions on a WebKit browser
Vivaldi
Customizable browser with built-in mail, calendar and feed reader
- Vivaldi is free.
- Vivaldi also lists Windows, Linux, Android and iOS apps.
- Vivaldi is end-to-end encrypted, according to its own site.
- Vivaldi also covers notes, calendar, email client, screenshots and rSS reader.
- Vivaldi does not cover ad and tracker blocking, which SigmaOS does.
Suits: Power users who keep dozens of tabs open
Limits worth knowing in SigmaOS
- It runs only on macOS; the FAQ says iOS and Windows support are coming.
- Unlimited Airis usage needs the paid Pro plan.
- The company's help docs list an older Pro price of $10 per month ($8 billed yearly); the homepage FAQ says $20 a month. Check the price in the app before buying.
- Pages on the site carry a 2024 copyright notice.
Common questions
What are the alternatives to SigmaOS?
The alternatives to SigmaOS in this directory are Arc, Zen Browser, Dia, Orion and Vivaldi. Each one has a side-by-side comparison with SigmaOS.
Is there a free alternative to SigmaOS?
Yes. Arc, Zen Browser and Vivaldi are free to use. Dia and Orion have a free plan alongside paid ones.
Which SigmaOS alternatives work on Windows?
The SigmaOS listing does not include a Windows app. Arc, Zen Browser, Dia and Vivaldi list one.
Which SigmaOS alternatives work on Linux?
The SigmaOS listing does not include a Linux app. Zen Browser, Orion and Vivaldi list one.
Is there an open-source alternative to SigmaOS?
Zen Browser is described as open source on its own site.
When were these prices checked?
Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 12, 2026. Vendors change prices without notice, so confirm on their site before you buy.