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Sigma AI Browser

Private AI browser with a local LLM — agent mode, deep research and chat-with-page, processed on device

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freemiumThree tiers with a 20% discount for annual billing. Free is $0 per month and includes chat on all platforms, analysis of text, images and files, chat-with-page, and limited access to the AI agent, image generation, Telegram search, text writer, deep research and image animation. Plus lists at $10 per month and is $8 per month on annual billing: unlimited prompts, unlimited text writer, 50× more file uploads, 10× more web searches, 20× more image generations, 12× more deep research runs, 25× more Telegram searches, five additional AI agent uses, 5× more image animations and early access to new features. Pro Unlimited lists at $75 per month and is $60 per month on annual billing, lifting file uploads, web search, image generation, deep research, Telegram search and AI agent use to unlimited, with 25× more image animations. The browser itself is a free download on macOS, Windows and the App Store.View full pricing →

Visit Sigma AI Browser

https://www.sigmabrowser.com

💰 View Detailed Pricing →Try Sigma AI Browser →

About Sigma AI Browser

Sigma is a privacy-first AI browser for macOS, Windows and iOS built by the team behind Atomic Wallet and Atomic Mail. Its distinguishing feature is Eclipse, a local LLM that runs inside the browser itself: prompts and page content are processed on your device rather than shipped to a server, which means summarising a sensitive document or asking about a page you are logged into does not leave the machine. Around that sits the feature set you would expect from an AI browser — an agent that navigates pages, fills forms and completes multi-step tasks end to end from a goal you describe; an AI chat that answers questions, runs deep research across sources, generates images and drafts text; chat-with-page for the document in front of you; and image animation. The company is explicit that only the sensitive part of each interaction stays local, minimising rather than eliminating server processing, which is a more honest framing than most privacy marketing manages. A built-in ad blocker filters intrusive ads at the browser level. The product sits inside a wider suite — Atomic Chat, Atomic Mail, Atomic Bot and Atomic Agent — that shares the same local-first posture, and the company is registered in Tallinn, Estonia, which puts it under EU data law. Downloads are available for macOS, Windows and the App Store.

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Key Features

✓Eclipse — a local LLM running inside the browser, on-device
✓Agent mode that navigates, fills forms and completes tasks end to end
✓Deep research across sources plus image generation in the same chat
✓Chat with the current page without sending it to a server
✓Built-in ad blocker
✓macOS, Windows and iOS builds

Sigma AI Browser Pros & Cons

✅ Pros

  • +On-device inference is a genuine privacy difference, not a policy promise
  • +$8–10 for unlimited prompts undercuts most standalone AI subscriptions
  • +Free tier is a real browser, not a time-limited trial

⚠️ Cons

  • −The jump from Plus to Pro Unlimited is $60–75, with nothing in between
  • −Local models are meaningfully weaker than frontier cloud models
  • −Everything on Free is multiplier-limited, making the caps hard to reason about

Tags

ai-browserlocal-llmprivacybrowser-agentdeep-researchad-blocker
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