SigmaOS - The AI-powered browser for focused productivity

Tired of Losing Your Tabs in a Sea of Browser Windows?

Picture this: you're building a new product while managing marketing campaigns and keeping an eye on competitor news. You have 47 tabs open across three browser windows. You need to find that one article you opened two hours ago, but first you have to remember which window it was in—and which project you were working on when you opened it.

Sound familiar? You're not alone. The average knowledge worker has 30+ tabs open at any given time. The browser has become our second brain, but instead of helping us think, it's become a source of constant context-switching and cognitive overload.

What if your browser could actually organize your work the way your brain thinks about it?

Introducing SigmaOS: A Browser Built for Focus

SigmaOS is a native macOS browser built on WebKit—the same rendering engine that powers Safari—but that's where the similarity ends. Rather than just displaying web pages, SigmaOS is designed around how you actually work: in projects, tasks, and focused sessions.

The secret lies in two innovations: Workspace and Airis.

Workspace lets you group tabs by project or purpose. Think of it like having separate rooms in a house—your "Writing" room contains all the research and tools you need for content creation, while your "Product Development" room holds everything related to building your product. One click and you're in a completely different context, with all the relevant tabs right there.

Airis is your AI browsing companion. It understands what you're looking at and helps you interact with any website conversationally. Need to extract key information from a lengthy article? Ask Airis. Want to search the web in plain language without navigating away from your current task? Airis handles it. This isn't just a chatbot tacked onto a browser—it's the first AI browser engine (called A1Kit) built specifically to understand your browsing context.

Why Teams and Individuals Are Making the Switch

SigmaOS has already earned its place in the toolkit of thousands of users, with over 30% on paid plans. The product struck a chord: it won Product Hunt's Day, Week, and Month categories simultaneously—a rare triple crown that speaks to real user enthusiasm.

It's not just early adopters. Ali Abdaal, one of YouTube's most prominent productivity creators, uses SigmaOS. Gustaf Alströmer, Y Combinator's Partner focused on startups, relies on it daily. Ziv Reichert and other respected figures in the tech community have made SigmaOS their browser of choice.

The company behind SigmaOS is SigmaOS, Inc., founded in London in 2021 by Mahyad Ghassemibouyaghchi, Ali Attar, and Saurav Mitra. The team went through Y Combinator's Summer 2021 batch and raised a $4 million seed round in 2022, led by LocalGlobe with participation from Y Combinator, 7percent Ventures, and Moonfire Ventures. TechCrunch has featured the company as one to watch in the browser space.

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Your Browsing Experience, Reimagined

Most browsers are passive containers for web content. SigmaOS is different—it's an active tool that adapts to your workflow. Here's what you can actually do with it.

Organize Life into Workspaces

When you open SigmaOS for the first time, you'll notice something different: a left sidebar that looks less like a browser and more like a productivity app. This is where Workspaces live.

Each Workspace is like a dedicated room for a specific project or area of focus. Create a Workspace for "Client Work," another for "Personal Finance," a third for "Learning React." Within each Workspace, you have a clean slate with only the tabs relevant to that context.

The magic moment comes when you switch between Workspaces. Instead of hunting through dozens of mixed tabs, you click to a different Workspace and instantly see only what matters for that task. No more "where was that link?" frustration.

You can create unlimited Workspaces, rename them intuitively, and organize them in whatever way makes sense to you. Many users find that simply having this separation reduces their cognitive load dramatically—they don't need to hold all their projects in mind simultaneously.

Vertical Tabs That Feel Like a To-Do List

Traditional horizontal tabs are notoriously hard to manage when you have many open. They're cramped, hard to read, and require precise clicking.

SigmaOS uses vertical tabs displayed in the left sidebar—more like a to-do list than a traditional tab bar. You can see more tabs at once, scan them quickly, and drag to reorder. When you have 20 tabs open, you can still see them all without squinting.

But here's what makes vertical tabs powerful: Tabs as Tasks. Each tab can be marked as "done" when you've completed what you needed from it, or "locked" to keep it permanently available. This creates a natural workflow where completed items fade away and important references stay put—no more accidentally closing a tab you needed.

Search Without Leaving Your Keyboard

Press the spacebar anywhere in SigmaOS and Lazy Search activates. This is your gateway to searching tabs, the web, commands, or bookmarks—all without reaching for your mouse.

Lazy Search understands context. Type something and it searches your open tabs first. Type a URL and it goes there. Type a command and it executes. It's designed to keep you in the flow state by eliminating the friction between thinking and doing.

Airis: Your AI Browsing Companion

This is where SigmaOS truly differentiates itself. Airis isn't a sidebar chatbot—it's context-aware. When you're on any website, Airis understands what you're looking at and can help you interact with that specific page.

Talk to any website. Ask Airis to find specific information on the page you're viewing. Need to extract pricing details from a competitor's site or find the key takeaways from a long blog post? Airis does it in seconds.

Search in your own words. Instead of crafting the perfect Google query, describe what you want to know naturally. "What are the best productivity tips for remote workers?" Airis searches the web and returns results that actually answer your question—not just pages that happen to contain your keywords.

Get instant summaries. The Simplify feature (activated by pinching or pressing S) condenses any webpage into a brief, interactive summary. Perfect for getting the gist of a long article without reading every word.

Airis is available in the free version with limited usage. The Pro version ($20/month or $96/year) gives you unlimited access to GPT-4o-powered Airis, plus unlimited "Look it up" searches and interactive summaries.

Focus Mode: Enter the Zone

Press F and watch the interface disappear. Focus Mode hides all toolbars, leaving only the webpage content in full-screen glory. This is browser immersion—no distractions, no visual clutter, just you and the content.

Combined with Workspaces, Focus Mode creates a powerful workflow: jump into a Workspace, press F, do your deep work, press F again to emerge, and switch to your next project. The boundaries between contexts become clear and intentional.

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Who Should Switch to SigmaOS?

SigmaOS isn't for everyone—but it's genuinely transformative for specific types of users. Let's see if you recognize yourself here.

Multitaskers Managing Multiple Projects

You're the person with three browser windows open, each with 15 tabs, each window representing a different project or client. When you need to switch context, you manually hunt for the right window and the right tab.

The SigmaOS solution: Create a Workspace for each project. Now "Project Alpha" contains only the tabs related to that project. Switching from client work to personal research takes one click—no more window shuffling, no more tab hunting. Your browser finally mirrors how your brain organizes work.

Students Managing Courses

You're taking four courses, each with its own learning management system, lecture recordings, research papers, and reference websites. Your browser is a mess of tabs from different classes mixed together.

The SigmaOS solution: Create a Workspace for each course. Add your LMS, Google Docs for that class, and relevant research tabs. Lock the tabs you need always accessible. When it's time to study, switch to that Workspace and focus only on that course's materials.

Researchers and Information Gatherers

Your job involves gathering information from dozens of sources—news articles, academic papers, competitor websites, industry reports. You open tabs compulsively because you might need the information later.

The SigmaOS solution: Vertical tabs let you see everything at once. Use Airis to summarize pages without reading everything. Mark tabs as done when you've extracted what you need. Lazy Search helps you find that one article from yesterday in seconds. Your research process becomes systematic instead of chaotic.

Founders and Entrepreneurs

You're building a company while simultaneously handling marketing, fundraising, competitive analysis, and team management. Each area has its own set of tools, news sources, and communication channels—all living in your browser.

The SigmaOS solution: Create Workspaces for "Product," "Marketing," "Fundraising," "Competitors." Use Focus Mode to truly focus on one area at a time. The browser becomes a command center for your business rather than a source of constant distraction.

Creatives Collecting Inspiration

You collect screenshots, articles, reference images, design inspiration, and potential collaborators—all in browser tabs. Finding anything in your "inspiration archive" is nearly impossible.

The SigmaOS solution: Organize inspiration into themed Workspaces. Use the Magic Rename feature—AI automatically renames locked tabs to describe their content clearly. Mark items as done when you've used them. Your creative library becomes searchable and usable.

Privacy-Conscious Users

You don't want to be tracked across the web, you hate intrusive ads, and you'd rather not be the product that browser companies are selling to advertisers.

The SigmaOS solution: Built-in ad blocking keeps pages clean. WebKit's Intelligent Tracking Prevention protects your privacy. You can choose privacy-focused search engines like DuckDuckGo, Ecosia, or You.com. The company is funded by users, not advertisers—so your interests align with SigmaOS's business model.

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Getting Started: Migration and Setup in Minutes

Ready to try SigmaOS? Here's how to make the switch smoothly.

Download and Install

Visit sigmaos.com/download to grab the app. SigmaOS requires macOS 12 or later. The installation is straightforward—just drag to Applications and open.

One-Click Migration

Here's the part that surprises most people switching from other browsers: it takes less than two minutes.

Press Cmd+K to open the command palette, then type "Migrate browser." SigmaOS supports direct migration from Chrome, Safari, Brave, Opera, Firefox, Vivaldi, Edge, and Sidekick. You'll import:

• All saved passwords and login information
• Browsing history
• Bookmarks
• Cookies (so you stay logged into sites)

After migration, you're ready to go with everything in place. No re-entering passwords, no rebuilding your bookmark structure.

Essential Setup Steps

Configure your shortcuts. SigmaOS defaults work well, but you can customize everything. Press Cmd+K and search "SigmaOS Preferences" to adjust keyboard shortcuts, startup behavior, and more.

Choose your search engine. By default, you can use DuckDuckGo, Ecosia, You.com, or Bing. Go to Preferences → Privacy to set your default.

Set up sync. Create a free SigmaOS account and sign in. Your Workspaces, preferences, and settings sync automatically across any Mac you use. Start on your laptop, continue on your desktop—exactly where you left off.

Bring Your Extensions

Yes, you read that right. SigmaOS is the first WebKit browser to support Chromium extensions. This is a significant technical achievement and a major reason to consider switching if you've been held back by extension dependency.

You can install popular extensions like:

• Grammarly — Writing assistance
• LastPass / 1Password — Password management
• Todoist — Task management
• Honey — Coupon finding

The extension ecosystem is growing, and the team is actively working on expanding compatibility. If there's a critical extension you need, check the community forums—there's a good chance someone has figured out a solution.

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What Makes SigmaOS Work Under the Hood

If you're technically inclined—or simply want to understand why SigmaOS feels different—you'll appreciate what the team has built.

WebKit Foundation, SwiftUI Craftsmanship

SigmaOS runs on WebKit, the same rendering engine that powers Safari and powers millions of Apple devices. This isn't a fork or a modified version—it's native WebKit implementation, which means you get the security, performance, and standards compliance that Apple invests heavily in.

The browser UI itself is built with SwiftUI, Apple's modern UI framework. This isn't an Electron app (like Chrome or Edge) that wraps web technologies in a desktop shell. SigmaOS feels like a genuine macOS application—responsive, native-feeling, and optimized for Apple hardware.

A1Kit: The First AI Browser Engine

This is the technical differentiator. Most "AI browsers" simply add a chatbot sidebar to an existing browser. SigmaOS built A1Kit from the ground up as an AI engine specifically for browsing.

A1Kit uses LLM agents combined with custom page extraction to understand what you're looking at. When you ask Airis about the page you're on, it doesn't just scrape the text—it understands the page's structure and context. This is why Airis can answer specific questions about content you've opened, not just generic searches.

The result is an AI assistant that genuinely helps with browsing tasks rather than feeling like a bolted-on gimmick.

Performance That Respects Your Battery

If you've used Chrome on a MacBook, you've likely noticed it drains battery faster than Safari. SigmaOS is optimized differently.

Page Suspension automatically pauses tabs you haven't looked at recently, freeing up memory and CPU. This is particularly valuable if you tend to keep many tabs open—you get to keep your workflow without the performance penalty.

The app is optimized for Apple Silicon (M1/M2 chips), meaning it runs efficiently on modern Macs. You'll see lower power consumption compared to browsers built on older architectures.

Security That Leverages Apple

SigmaOS integrates with Apple Keychain for password storage—the same system Safari uses. Your credentials are protected by the same encryption that secures your Mac.

For additional security, you can enable Touch ID or biometric authentication to unlock SigmaOS, preventing unauthorized access if you step away from your machine.

Privacy Without Compromise

Built on WebKit, SigmaOS inherits Intelligent Tracking Prevention—Apple's sophisticated system for blocking cross-site trackers. You can customize privacy settings to your comfort level, and because SigmaOS is funded by subscriptions rather than advertising, there's no conflict of interest in protecting your data.

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Frequently Asked Questions