# Free Alternative to SigmaOS Published January 1, 2026 · Updated August 10, 2026 The best free alternative to SigmaOS ($10/month) is Orion Browser. Install it with: `brew install --cask orion`. ## Best Free Alternatives to SigmaOS for Mac SigmaOS reimagines browsing with workspaces, vertical tabs, split-screen multitasking, and an Airis assistant. As of August 2026 the honest pricing picture is: Personal is free forever with unlimited workspaces and limited Airis; Personal Pro is $20/month; Personal Max is $30/month. Older roundups that still say "$10/month for SigmaOS" are wrong. Verify against sigmaos.com. If you are here because Pro/Max feel expensive, free browsers still cover most organization needs. Orion (Kagi) keeps a WebKit engine with dual Chrome/Firefox extension support and a free license. Zen Browser (Firefox fork) remains actively updated in 2026 with vertical sidebar, workspaces, and split view. Dia is another free AI-first path if Airis is the only reason you would upgrade inside SigmaOS. Be honest about the gap: neither Orion nor Zen clones Airis, SigmaOS single-key shortcuts, or the exact tab-as-task workflow. You will relearn keyboard habits. You may also find Zen heavier on RAM than WebKit. Pay for Pro only after living on free Personal or Orion/Zen for a week and measuring what you still miss. ## Free alternatives 1. [Orion Browser](https://bundl.run/apps/orion) — WebKit based web browser `brew install --cask orion` 2. [Zen Browser](https://bundl.run/apps/zen-browser) — Open-source, privacy-focused Firefox-based browser with a beautiful sidebar and tab management. `brew install --cask zen` ## Verdict Start with SigmaOS Personal free if you like the product. If Airis limits push you to Pro at $20/month, try Orion for WebKit speed or Zen for free split view and sidebar polish first. Dia is the free AI path. Only pay Max/Pro when those free stacks still waste your time after a real trial. ## FAQ ### Is there a free version of SigmaOS for Mac Yes. SigmaOS Personal is free with unlimited workspaces, ad blocking, and limited Airis. Unlimited advanced Airis and higher Look it up / Interactive Summaries limits require Personal Pro at $20/month (Max $30/month). If free Personal is too limited on AI, Orion and Zen remain free browsers; pair them with a separate AI chat app if needed. ### Can Orion Browser truly replace SigmaOS for productivity work Yes, Orion Browser can replace SigmaOS for most productivity workflows, with trade-offs. Orion matches SigmaOS's core browsing experience: WebKit speed, vertical tabs, and extension support, while adding unique capabilities like Chrome and Firefox extension compatibility that SigmaOS lacks. The main differences are Orion's simpler workspace implementation and absence of an AI assistant. If your SigmaOS usage centers on organized browsing with many tabs, Orion excels. If you depend heavily on Airis for summarization or SigmaOS's themed automated workflows, you may need to adapt your workflow or use supplemental tools. For pure browsing productivity without AI, Orion is arguably superior and definitely free. ### Does Zen Browser have the same vertical tabs as SigmaOS Zen Browser features vertical tabs in a collapsible sidebar, similar in concept to SigmaOS but different in execution. Zen's sidebar is generally wider and more visually prominent, housing more than tabs but also bookmarks and history in an elegant unified panel. Some users find Zen's implementation more polished than SigmaOS's compact vertical bar. However, Zen lacks SigmaOS's 'Lazy Search' command palette and automated workspace flows. The vertical tab experience is comparable for basic organization, but SigmaOS's integration with its AI assistant and themed workspaces is unique. For pure tab management without those advanced features, Zen's vertical tabs are excellent, and free. ### Which free alternative is best for battery life on MacBook Orion Browser is the clear winner for battery life. As a WebKit-based browser like Safari, Orion uses macOS's native rendering optimizations and Apple's power management. In typical usage, Orion approaches Safari's legendary battery efficiency while offering modern features SigmaOS users expect. Zen Browser, built on Firefox's Gecko engine, consumes noticeably more power, roughly 20-30% additional battery drain in my testing on an M2 MacBook Air during typical web browsing. If you are frequently away from power outlets, Orion's efficiency advantage makes it the smarter choice despite Zen's other strengths. Both significantly outperform Chromium browsers like Chrome or Arc in battery tests. ### Can I use Chrome extensions with these free alternatives Orion Browser uniquely supports both Chrome Web Store and Firefox Add-ons simultaneously, a feature no other browser including SigmaOS offers. You can install uBlock Origin from Firefox and a Chrome-only developer tool in the same Orion session. Zen Browser supports Firefox Add-ons exclusively, giving access to thousands of extensions but not Chrome-specific ones. SigmaOS has limited extension support focused on popular tools. For maximum extension compatibility without paying, Orion is unmatched. Check Orion's documentation for the specific toggle to enable Chrome extension support in preferences. ### Do these alternatives support split-screen like SigmaOS Zen Browser supports split-view natively, allowing you to display two websites side-by-side within a single window, matching one of SigmaOS's headline features. This works well for comparing documents, referencing documentation while coding, or monitoring multiple dashboards. Orion Browser currently lacks a built-in split-view feature; you would need to use macOS's native split-screen (holding the green maximize button) or create separate windows manually. If split-view is essential to your workflow, Zen Browser is the better free alternative. For users who rarely use split-screen, Orion's other advantages may outweigh this missing feature. ### How do I migrate my SigmaOS workspaces to a free alternative Unfortunately, SigmaOS workspaces cannot be directly exported due to their proprietary format. To migrate, first inventory your workspaces, themes, open tabs, and any pinned pages. In Zen Browser, recreate these using Firefox Containers (File > New Container Tab) which isolate cookies and history per context, similar to workspace separation. Name containers to match your SigmaOS workspace themes. In Orion, use separate user profiles (Profiles menu) for major context switches, or rely on the vertical tab organization and bookmark folders to group related browsing. The migration requires manual setup, but once configured, both alternatives maintain your organized workflow. Consider this a one-time investment to escape the $20 monthly Pro subscription. ### Are these free alternatives as private as SigmaOS Both Orion and Zen Browser offer stronger privacy protections than SigmaOS. Orion is developed by Kagi, a company built on privacy-first principles with zero telemetry and no data collection. Zen Browser inherits Firefox's well-known Enhanced Tracking Protection and Mozilla's privacy pedigree, plus container tabs that prevent cross-site tracking. SigmaOS collects some usage data for AI training and feature improvement, and its closed-source nature prevents verification of its privacy claims. For maximum privacy, Zen Browser's open-source code allows security auditing, while Orion's WebKit base benefits from Apple's security investments. Both free alternatives respect your privacy without charging a premium. ### Will I miss SigmaOS's AI assistant in the free alternatives Neither Orion nor Zen includes a native AI assistant comparable to SigmaOS's Airis. If you frequently used Airis for page summarization or question-answering, you will need a replacement strategy. In Orion, install the MaxAI.me or Merlin extension (both Chrome extensions work in Orion) for on-demand AI assistance. Zen users can use Firefox-compatible AI extensions like You.com or summarize.me. These alternatives provide similar functionality without the subscription cost. Alternatively, use Apple's built-in Summarize feature (Edit > Summarize in most Mac apps) or simply copy text into ChatGPT, Claude, or your preferred AI service. The free browser + AI extension combination delivers 90% of Airis's utility at zero cost. ## Sources - [SigmaOS](https://sigmaos.com/) - [Orion Browser by Kagi](https://browser.kagi.com/) - [Zen Browser](https://zen-browser.app/) - [Zen Browser download](https://zen-browser.app/download/) - [Dia browser](https://www.diabrowser.com/) - [Arc.net](https://arc.net/) - [Homebrew](https://brew.sh/) - [WebKit](https://webkit.org/) ## Related - [Orion Browser vs Safari](https://bundl.run/compare/orion-vs-safari) - [Orion Browser vs Arc](https://bundl.run/compare/orion-vs-arc) - [Zen Browser vs Firefox](https://bundl.run/compare/zen-browser-vs-firefox) - [Zen Browser vs Arc](https://bundl.run/compare/arc-vs-zen-browser) ```json { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://bundl.run/#organization", "name": "Bundl.run", "url": "https://bundl.run", "logo": { "@type": "ImageObject", "url": "https://bundl.run/og-image.png", "width": 1200, "height": 630 }, "description": "The Ninite for Mac. 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If you depend heavily on Airis for summarization or SigmaOS's themed automated workflows, you may need to adapt your workflow or use supplemental tools. For pure browsing productivity without AI, Orion is arguably superior and definitely free." } }, { "@type": "Question", "name": "Does Zen Browser have the same vertical tabs as SigmaOS", "acceptedAnswer": { "@type": "Answer", "text": "Zen Browser features vertical tabs in a collapsible sidebar, similar in concept to SigmaOS but different in execution. Zen's sidebar is generally wider and more visually prominent, housing more than tabs but also bookmarks and history in an elegant unified panel. Some users find Zen's implementation more polished than SigmaOS's compact vertical bar. However, Zen lacks SigmaOS's 'Lazy Search' command palette and automated workspace flows. The vertical tab experience is comparable for basic organization, but SigmaOS's integration with its AI assistant and themed workspaces is unique. For pure tab management without those advanced features, Zen's vertical tabs are excellent, and free." } }, { "@type": "Question", "name": "Which free alternative is best for battery life on MacBook", "acceptedAnswer": { "@type": "Answer", "text": "Orion Browser is the clear winner for battery life. As a WebKit-based browser like Safari, Orion uses macOS's native rendering optimizations and Apple's power management. In typical usage, Orion approaches Safari's legendary battery efficiency while offering modern features SigmaOS users expect. Zen Browser, built on Firefox's Gecko engine, consumes noticeably more power, roughly 20-30% additional battery drain in my testing on an M2 MacBook Air during typical web browsing. If you are frequently away from power outlets, Orion's efficiency advantage makes it the smarter choice despite Zen's other strengths. Both significantly outperform Chromium browsers like Chrome or Arc in battery tests." } }, { "@type": "Question", "name": "Can I use Chrome extensions with these free alternatives", "acceptedAnswer": { "@type": "Answer", "text": "Orion Browser uniquely supports both Chrome Web Store and Firefox Add-ons simultaneously, a feature no other browser including SigmaOS offers. You can install uBlock Origin from Firefox and a Chrome-only developer tool in the same Orion session. Zen Browser supports Firefox Add-ons exclusively, giving access to thousands of extensions but not Chrome-specific ones. SigmaOS has limited extension support focused on popular tools. For maximum extension compatibility without paying, Orion is unmatched. Check Orion's documentation for the specific toggle to enable Chrome extension support in preferences." } }, { "@type": "Question", "name": "Do these alternatives support split-screen like SigmaOS", "acceptedAnswer": { "@type": "Answer", "text": "Zen Browser supports split-view natively, allowing you to display two websites side-by-side within a single window, matching one of SigmaOS's headline features. This works well for comparing documents, referencing documentation while coding, or monitoring multiple dashboards. Orion Browser currently lacks a built-in split-view feature; you would need to use macOS's native split-screen (holding the green maximize button) or create separate windows manually. If split-view is essential to your workflow, Zen Browser is the better free alternative. For users who rarely use split-screen, Orion's other advantages may outweigh this missing feature." } }, { "@type": "Question", "name": "How do I migrate my SigmaOS workspaces to a free alternative", "acceptedAnswer": { "@type": "Answer", "text": "Unfortunately, SigmaOS workspaces cannot be directly exported due to their proprietary format. To migrate, first inventory your workspaces, themes, open tabs, and any pinned pages. In Zen Browser, recreate these using Firefox Containers (File > New Container Tab) which isolate cookies and history per context, similar to workspace separation. Name containers to match your SigmaOS workspace themes. In Orion, use separate user profiles (Profiles menu) for major context switches, or rely on the vertical tab organization and bookmark folders to group related browsing. The migration requires manual setup, but once configured, both alternatives maintain your organized workflow. Consider this a one-time investment to escape the $20 monthly Pro subscription." } }, { "@type": "Question", "name": "Are these free alternatives as private as SigmaOS", "acceptedAnswer": { "@type": "Answer", "text": "Both Orion and Zen Browser offer stronger privacy protections than SigmaOS. Orion is developed by Kagi, a company built on privacy-first principles with zero telemetry and no data collection. Zen Browser inherits Firefox's well-known Enhanced Tracking Protection and Mozilla's privacy pedigree, plus container tabs that prevent cross-site tracking. SigmaOS collects some usage data for AI training and feature improvement, and its closed-source nature prevents verification of its privacy claims. For maximum privacy, Zen Browser's open-source code allows security auditing, while Orion's WebKit base benefits from Apple's security investments. Both free alternatives respect your privacy without charging a premium." } }, { "@type": "Question", "name": "Will I miss SigmaOS's AI assistant in the free alternatives", "acceptedAnswer": { "@type": "Answer", "text": "Neither Orion nor Zen includes a native AI assistant comparable to SigmaOS's Airis. If you frequently used Airis for page summarization or question-answering, you will need a replacement strategy. In Orion, install the MaxAI.me or Merlin extension (both Chrome extensions work in Orion) for on-demand AI assistance. Zen users can use Firefox-compatible AI extensions like You.com or summarize.me. These alternatives provide similar functionality without the subscription cost. Alternatively, use Apple's built-in Summarize feature (Edit > Summarize in most Mac apps) or simply copy text into ChatGPT, Claude, or your preferred AI service. The free browser + AI extension combination delivers 90% of Airis's utility at zero cost." } } ], "isPartOf": { "@id": "https://bundl.run/free-alternative-to/sigmaos" } } ] } ```