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SigmaOS alternatives: 3 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave SigmaOS: mac only, and limited extension support. We ranked 3 alternatives by how directly each one replaces SigmaOS, then by reviews, real visits and how recently each app's facts were checked against its own website. Dia currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Orion logoOrionFree plan + paidNomacOS, iOS4 of 459.6
  1. Orion logo

    1. OrionTop pick

    Best for: Apple users who want Safari-like efficiency with Chrome and Firefox extensions

    Free plan + paidmacOS, iOS

    59.6

    score / 100

    Why switch from SigmaOS

    Another efficient WebKit browser for Mac, with broad extension support.

    Pros

    • Runs many Chrome and Firefox extensions, even on iPhone
    • WebKit engine is efficient on Apple hardware
    • Zero telemetry and built-in ad blocking

    Cons

    • Apple platforms only for now
    • Some extensions don't work fully
    • Smaller team, so bugs can linger
    Visit Orion Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Orion a good SigmaOS alternative?

    Verified facts

    4 of 4 verified
    Engine
    WebKit
    Checked Oct 25, 2026help.kagi.com(opens source in a new tab)
    Telemetry
    None, with built-in ad blocking
    Checked Oct 25, 2026kagi.com(opens source in a new tab)
    Linux and Windows
    In development
    Checked Oct 25, 2026help.kagi.com(opens source in a new tab)
    Pitch
    WebKit, extensions and privacy
    Checked Oct 25, 2026kagi.com(opens source in a new tab)

Discontinued alternatives

  • Arc is no longer available.

The best SigmaOS alternative for…

The highest-ranked app in this list for each need.

Dia logo

Best SigmaOS alternative for most people

Dia

Arc's successor with profiles, sidebar tabs and AI, on Mac and Windows.

Zen Browser logo

Best SigmaOS alternative for a free option

Zen Browser

Open-source workspace browser on Firefox, across all desktops.

Orion logo

Best SigmaOS alternative for a free plan you can upgrade

Orion

Another efficient WebKit browser for Mac, with broad extension support.

Zen Browser logo

Best SigmaOS alternative for open source

Zen Browser

Open-source workspace browser on Firefox, across all desktops.

Dia logo

Best SigmaOS alternative for Mac

Dia

Arc's successor with profiles, sidebar tabs and AI, on Mac and Windows.

Dia logo

Best SigmaOS alternative for Windows

Dia

Arc's successor with profiles, sidebar tabs and AI, on Mac and Windows.

Zen Browser logo

Best SigmaOS alternative for Linux

Zen Browser

Open-source workspace browser on Firefox, across all desktops.

SigmaOS alternatives: common questions

What is the best alternative to SigmaOS?

Dia ranks first right now. Arc's successor with profiles, sidebar tabs and AI, on Mac and Windows. Orion and Zen Browser follow it in our ranking.

Is there a free alternative to SigmaOS?

Yes. Dia (free plan + paid), Orion (free plan + paid) and Zen Browser (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to SigmaOS?

Yes: Zen Browser.

Which SigmaOS alternatives work on Linux?

Zen Browser runs on Linux.

Why do people switch from SigmaOS?

The complaints we hear most: mac only; limited extension support; small startup behind it.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces SigmaOS, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.