Sigma AI Browser

Sigma is a Chromium based desktop browser that folds an AI assistant, an autonomous agent and a local language model into ordinary web browsing. It ships for macOS and Windows with a companion mobile app, and keeps the familiar browser furniture of bookmarks, history, password management and extensions while adding privacy defaults including TLS 1.3, HTTPS and DNS over HTTPS. Three capabilities carry the product. AI Chat answers questions, runs deep research, generates images and drafts text. The AI agent navigates pages, clicks, types and fills forms to complete tasks across websites, driven either by an API key or by local models in Private Mode. Eclipse is a language model built into the browser that runs on the device, so prompts are not sent to a server. Around these sit chat with page, highlight and translate, a built in ad blocker, separate private profiles encrypted behind a twelve word recovery phrase, and a browser identity with wallet and decentralized app connections. The published plans are Free at $0 per month, which allows chat on all platforms, text, image and file analysis, chat with page, and limited use of the agent, image generation and deep research. Plus is $10 per month billed monthly or $8 per month on annual billing, and lifts the limits on prompts, file uploads, web searches, image generation and deep research. Pro is $75 per month billed monthly or $60 per month on annual billing, and removes limits on uploads, web search, image generation, deep research and agent use. The browser is operated by Sigmabrowser OU, registered in Tallinn, Estonia. Agent mode runs third party agent frameworks rather than a model of the vendor's own, which is worth knowing if you expect a single integrated assistant.