# SigmaOS review (2026): is the free plan enough? > Mac browser with vertical tabs, workspaces and an AI assistant Checked Nov 12, 2026 ยท graded Nov 12, 2026 by ToolGPA. SigmaOS is a browser for macOS built on Apple's WebKit engine that also supports Chromium extensions. It uses vertical tabs and workspaces, treats tabs like tasks you can mark done, and has single-key shortcuts, split screen and an AI companion called Airis. A free Personal plan exists, and a paid Pro plan adds unlimited Airis use. - **Category:** Browsers - **Made by:** SigmaOS, Inc. - **Website:** https://sigmaos.com - **Runs on:** macOS - **Who should skip it:** Not for you if you use Windows or Linux, as it runs on macOS only. - **Facts last checked:** Nov 12, 2026 ## Pricing As of Nov 12, 2026, SigmaOS has a free plan, and paid plans start at $20 per month (Pro). - **Pricing model:** Free plan - **Free plan:** SigmaOS Personal is described as free forever; unlimited Airis AI usage is a Pro feature. - **Free trial:** None listed. | Plan | Price | What you get | | --- | --- | --- | | Personal | $0 | The browser for macOS, free, without unlimited Airis AI usage. | | Pro | $20 per month; billing basis not stated on the page | Unlimited Airis usage. The site says Pro starts at this price and gives students and educators 50% off. | Read from https://sigmaos.com/ on Nov 12, 2026. Prices change, so confirm with SigmaOS before buying. ## Ways to pay less - **50% off Pro for students and educators** (Education): The homepage FAQ says students and educators are eligible for a 50% discount on SigmaOS Pro. Source: https://sigmaos.com/ ## Key features - **Workspaces and vertical tabs:** Tabs are kept in separate workspace lists down the side of the window, and a workspace can use separate profiles to sign in to different accounts. - **Tabs as tasks:** Tabs can be marked as done when finished or locked to a workspace to keep them. - **Lazy Search:** Pressing the spacebar searches across open tabs, the web, commands and bookmarks. - **Airis assistant:** The AI companion can answer questions about the page you are on, search the web and read several pages at once, and a Simplify view summarizes a page. - **Ad blocker and Focus Mode:** A built-in ad blocker is included, and Focus Mode hides everything except the current page. - **Chromium extensions:** The FAQ says SigmaOS is a WebKit browser that also supports Chromium extensions. ## Good for - Mac users who want vertical tabs and workspaces - People who like single-key keyboard navigation - Students and educators, who the site says get 50% off Pro ## Worth knowing - 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. ## ToolGPA grades **GPA: 2.4 out of 4**, graded Nov 12, 2026. SigmaOS is a Mac browser with vertical tabs, workspaces and an AI assistant called Airis. The browser is free, but unlimited Airis needs Pro at $20 a month, and it runs only on macOS. - **Value for money: A.** The Personal plan is described as free forever, so the browser costs nothing. Unlimited Airis needs Pro at $20 a month, which is where this category's dearest tenth starts. - **Free plan and trial: B.** A free-forever plan one person could live on, with the AI helper limited rather than missing. - **Features: C.** Workspaces, vertical tabs, search across tabs and an ad blocker. Unlimited AI use is Pro only, and the help docs list an older Pro price of $10 against the homepage's $20. - **Ease of use: C.** No store rating on record. Workspaces, profiles and keyboard-first search take some learning. - **Platforms and integrations: D.** macOS only. The FAQ says iOS and Windows support are coming. These are ToolGPA's own grades. Graded from this listing, whose facts were read from SigmaOS's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among browsers - SigmaOS's GPA of 2.4 is higher than 17 of the 60 other browsers we grade, and level with 2. - It stands best on value for money (A, above 22 of 60) and worst on platforms and integrations (D, above 0). - Its paid plans start at $20 a month, against a middle price of $9.50 for the category: 16 of the 19 others that charge start lower. - On features, ease of use and platforms it scores 1.7 out of 4. 47 tools score higher and cost less. The category's chart of price against score: https://toolgpa.com/charts/browsers ## Keep it, or make your own? **Keep it.** To replace SigmaOS you would be making a web browser. That is not a weekend's work, with an AI app builder or without one. That makes this kind of software worth paying for, not this one in particular: 41 of the 60 other browsers grade higher. It costs $240 a year. - You could make: Ad and tracker blocking: an app builder makes this well. - You could not: A web browser. - You could not: A real app for macOS. Something home-made would be a web page. - You could not: It plugs into other products, Apple Keychain, 1Password and Bitwarden among them. - You could not: AI features, unless you pay a model provider for each request yourself. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Apple Keychain, 1Password, Bitwarden, Dashlane, LastPass **Tags:** Web browser, AI features, Keyboard-first, Ad and tracker blocking ## Alternatives - [Arc](https://toolgpa.com/tools/arc): Chromium-based browser with Spaces, Profiles and Split View. [Compare](https://toolgpa.com/compare/arc-vs-sigmaos) - [Zen Browser](https://toolgpa.com/tools/zen-browser): Free, open-source desktop browser built around vertical tabs. [Compare](https://toolgpa.com/compare/sigmaos-vs-zen-browser) - [Dia](https://toolgpa.com/tools/dia): AI browser for work that answers questions across tabs and tools. [Compare](https://toolgpa.com/compare/dia-vs-sigmaos) - [Orion](https://toolgpa.com/tools/orion): WebKit browser from Kagi that runs Chrome and Firefox extensions. [Compare](https://toolgpa.com/compare/orion-vs-sigmaos) - [Vivaldi](https://toolgpa.com/tools/vivaldi): Customizable browser with built-in mail, calendar and feed reader. [Compare](https://toolgpa.com/compare/sigmaos-vs-vivaldi) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 12, 2026: - https://sigmaos.com/ - https://sigmaos.com/download/mobile - https://docs.sigmaos.com/common-questions Page: https://toolgpa.com/tools/sigmaos Listed by ToolGPA (toolgpa.com).