What Is an AI Browser?
An AI browser is a web browser with built-in artificial intelligence that helps you search, summarize, organize, and interact with web pages.
Why Use Sigma AI Browser
Sigma packs the tools people usually pay several subscriptions for into one free browser. Here's what sets it apart from both traditional browsers and cloud-based AI tools.
Agentic AI browser
Sigma's built-in AI agent navigates pages, fills forms, and completes tasks end-to-end. Describe the goal — the agent handles the steps.
Local AI, full privacy
Download local AI models right in the browser or connect your own via API key. Prompts are processed on your device — no cloud, no data collection, works offline.
AI browser security
Open-source code, end-to-end encryption, phishing protection, and prompt injection defence keep your browsing and AI chats safe.
Free and fast
Sigma is a free AI browser — no subscriptions. It's also faster than Chrome, Safari, and Brave in Speedometer 3.0 benchmarks, with the lowest RAM use.
Sigma AI Browser Use Cases
From browser automation to everyday research — here's what people use Sigma for.
Web task automation
Let the AI browser agent book flights, compare prices, fill forms, and manage your inbox. AI browser automation turns multi-step chores into one prompt.
Research and deep search
Run deep research across sources, get organized answers with citations, and chat with any page to extract what matters.
Productivity at work
The best AI browser for productivity: summarize long reads, draft replies and documents, translate on the spot — without switching tabs or tools.
Private AI chats
Chat with local AI for sensitive topics — finance, legal, health. Everything is processed on your device, even offline.
How Sigma AI Browser Works
Download and install
Get Sigma AI Browser for macOS, Windows, iOS, or Android. Free download, no account required. Setup takes under a minute — open the app and you're ready to browse.
Choose your AI mode
Switch between Search, AI Chat, and Agent from the start page. Pick a cloud model or a local one for full privacy. Local models run entirely on your device, so nothing you type leaves it.
Browse with AI
Ask questions, summarize pages, run deep research, or hand tasks to the agent — AI works in every tab. Highlight text to translate it on the spot — and when you need sources compared, open Deep Research.
Best AI Browsers Compared (2026)
How Sigma stacks up against other AI browsers and traditional ones like Chrome, Safari, and Brave.
Sigma is the only free AI browser with a built-in agent, local AI, and open-source code.
Download Sigma Browser
Questions & Answers
reach out to us on X at @Sigma_Browser
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