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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
1Dia logoDiaFree plan + paidNomacOS, Windows4 of 462.6
2Zen Browser logoZen BrowserOpen sourceYesWindows, macOS, Linux4 of 457.2
  1. Dia logo

    1. DiaTop pick

    Best for: Former Arc users and knowledge workers who want AI built into their browser

    Free plan + paidmacOS, Windows

    62.6

    score / 100

    Why switch from SigmaOS

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

    Pros

    • Imports Arc Spaces, tabs and passwords directly
    • Free browser tier with no AI features required
    • End-to-end encrypted sync

    Cons

    • AI features need a paid plan
    • No Linux or mobile apps
    • Young product still changing quickly
    Visit Dia Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    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 Dia a good SigmaOS alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Better Browser, free
    Checked Oct 25, 2026diabrowser.com(opens source in a new tab)
    AI plan
    $10/month (Better Answers)
    Checked Oct 25, 2026diabrowser.com(opens source in a new tab)
    Platforms
    macOS and Windows
    Checked Oct 25, 2026diabrowser.com(opens source in a new tab)
    Engine
    Chromium
    Checked Oct 25, 2026diabrowser.com(opens source in a new tab)
  2. Zen Browser logo

    2. Zen Browser

    Best for: Arc fans who want a similar sidebar layout on Firefox, without AI

    Open sourceWindows, macOS, Linux

    57.2

    score / 100

    Why switch from SigmaOS

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

    Pros

    • Workspaces, split view and compact mode built in
    • Firefox engine with full uBlock Origin support
    • Free and open source on all desktop platforms

    Cons

    • No mobile app
    • Smaller team, so updates can lag Firefox
    • Some rough edges in newer features
    Visit Zen Browser Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    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 Zen Browser a good SigmaOS alternative?

    Verified facts

    4 of 4 verified
    Price
    Free and open source
    Checked Oct 25, 2026zen-browser.app(opens source in a new tab)
    Licence
    MPL-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Platforms
    macOS, Windows, Linux
    Checked Oct 25, 2026zen-browser.app(opens source in a new tab)
    Key features
    Workspaces, Compact Mode, Glance, Split View
    Checked Oct 25, 2026zen-browser.app(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.