SigmaOS Alternatives

SigmaOS is described as 'The new home for your internet. One window. Many workspaces. All your tabs' and is a Web Browser in the web browsers category. There are more than 100 alternatives to SigmaOS for a variety of platforms, including Windows, Mac, Linux, Android and Android Tablet apps. The best SigmaOS alternative is Mozilla Firefox, which is both free and Open Source. Other great apps like SigmaOS are Zen Browser, Brave, Google Chrome and Tor Browser.

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SigmaOS alternatives page was last updated Oct 30, 2025

Fennec F-Droid
106 likes
Browser using the Gecko layout engine to render web pages, which implements current and anticipated web standards.
208 Fennec F-Droid alternatives
Cost / License
Free
Open Source (MPL-2.0)
Application type
Web Browser
Origin
International
Platforms
Android
F-Droid
+3
Is Fennec F-Droid a good alternative to SigmaOS?
Firefox Developer Edition
244 likes
Firefox Developer Edition brings you latest features, fast performance, and the development tools you need to build for the open web. Its powerful development tools will extend your ability to work across multiple platforms from one place.
184 Firefox Developer Edition alternatives
Cost / License
Free
Open Source (MPL-2.0)
Application type
Web Browser
Origin
United States
Platforms
Mac
Windows
Linux
PortableApps.com
+2
Is this a good alternative to SigmaOS?
Safari
559 likes
The best browser for your Mac is the one that comes with your Mac. Safari is faster and more energy efficient than other browsers. Handy tools help you save, find, and share your favorite sites. Built-in privacy features help keep your browsing your business.
209 Safari alternatives
Cost / License
Free
Proprietary
Application type
Web Browser
Origin
United States
Platforms
Mac
iPhone
iPad
+4
Is Safari a good alternative to SigmaOS?
Ad
Rambox
A digital workspace organizer that allows you to unify as many applications as you want, all in one place. It is perfect for those who care about productivity while working with many business and personal apps.

https://rambox.app
Learn More
SeaMonkey
249 likes
Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.
190 SeaMonkey alternatives
Cost / License
Free
Open Source
Application type
Web Browser
Origin
Germany
EU
Platforms
Mac
Windows
Linux
BSD
PortableApps.com
+3
Is SeaMonkey a good alternative to SigmaOS?
Deta Surf
36 likes
Workspace fusing browsing, file management, and AI with local-first data; offers note-taking, applet creation, offline media storage, YouTube and PDF interaction, customizable AI-powered notes, citation tools, split views, sidebar navigation, and privacy features.
97 Deta Surf alternatives
Cost / License
Free
Open Source (Apache-2.0)
Application type
Note-taking
Origin
Germany
EU
Platforms
Mac
Windows
Linux
+9
Is Deta Surf a good alternative to SigmaOS?
DuckDuckGo Browser
89 likes
Privacy-focused open-source smartphone browser by DuckDuckGo blocks trackers, enforces encrypted connections, and provides a Privacy Grade. Partners with 'Terms of Service Didn't Read' and offers features like tabs, bookmarks, and autocomplete, keeping search data private.
188 DuckDuckGo Browser alternatives
Cost / License
Freemium
Open Source (Apache-2.0)
Application type
Web Browser
Origin
United States
Platforms
Mac
Windows
Android
iPhone
Android Tablet
iPad
F-Droid
+5
Is DuckDuckGo Browser a good alternative to SigmaOS?
Orion Browser
57 likes
WebKit-based privacy browser supporting Chrome and Firefox extensions, zero telemetry, built-in ad-blocker, anti-tracking for enhanced privacy, native macOS and iOS integration, lightweight performance, battery-saving technology, and a streamlined browsing experience.
92 Orion Browser alternatives
Cost / License
Freemium
Proprietary
Application type
Web Browser
Origin
United States
Platforms
Mac
Linux
iPhone
iPad
+8
Is Orion Browser a good alternative to SigmaOS?
Falkon
176 likes
Falkon, formerly QupZilla, is a QtWebEngine based cross-platform web browser.

It aims to be a lightweight web browser available through all major platforms.

Falkon has all standard functions you expect from a web browser. It includes bookmarks, history (both also in sidebar).
196 Falkon alternatives
Cost / License
Free
Open Source (GPL-3.0)
Application type
Web Browser
Origin
Germany
EU
Platforms
Linux
KDE Plasma
Flathub
Haiku
Snapcraft
Is Falkon a good alternative to SigmaOS?
GNU IceCat
128 likes
Gnuzilla is the GNU version of the Mozilla suite, and GNU IceCat is the GNU version of the Mozilla Firefox browser. Its main advantage is an ethical one: it is entirely free software.
Cost / License
Free
Open Source
Application type
Web Browser
Origin
United States
Platforms
Linux
Android
+1
Is GNU IceCat a good alternative to SigmaOS?
Rambox
144 likes
A digital workspace organizer that allows you to unify as many applications as you want, all in one place. It is perfect for those who care about productivity while working with many business and personal apps.
41 Rambox alternatives
Cost / License
Freemium
Proprietary
Application type
Instant Messenger
Origin
Argentina
Platforms
Mac
Windows
Linux
Snapcraft
+9
Is Rambox a good alternative to SigmaOS?
Iceraven
41 likes
A web browser for Android, based on Mozilla's Fenix version of Firefox, GeckoView and Mozilla Android Components.
207 Iceraven alternatives
Cost / License
Free
Open Source (MPL-2.0)
Application type
Web Browser
Origin
International
Platforms
Android
Android Tablet
+7
Is Iceraven a good alternative to SigmaOS?
Yandex Browser
186 likes
Yandex Browser is a simple and easy-to-use internet browser. Based on the Chromium technology platform, it loads pages quickly, just shows you what you need and gives you plenty of space for viewing webpages.
180 Yandex Browser alternatives
Cost / License
Free
Proprietary
Application type
Web Browser
Origin
Russia
Platforms
Mac
Windows
Linux
Android
iPhone
Android Tablet
HUAWEI AppGallery
iPad
Flathub
Samsung Galaxy Store
Android TV
+3
Is Yandex Browser a good alternative to SigmaOS?