Sigma

Overview

Sigma AI Browser is a free, private, AI-first agentic browser built on the Chromium engine. It is designed to be impressively light, packed with features, and fast by design, significantly improving browsing speed and memory efficiency compared to popular browsers such as Chrome, Safari, and Brave. Rather than a conventional browser that merely renders web pages, Sigma integrates an AI agent that actively works on your behalf — navigating pages, filling forms, managing tasks, and completing workflows end-to-end. Users simply describe the desired outcome, and the agent handles the underlying steps across websites, saving time on repetitive online operations.

At its core, Sigma delivers a suite of AI-driven capabilities. The built-in Eclipse local LLM runs entirely on-device, enabling private offline AI interactions without cloud processing or server-side prompt transmission. The AI Chat interface unifies question answering, deep research, image generation, and text creation in a single workspace. Deep Research mode allows users to queue sources, cluster information, and generate structured insights for complex analytical tasks. The Chat with Page function turns any website into a conversational context, producing instant summaries and content exploration without leaving the current page. Quick Translate provides instant language translation for highlighted text, while the AI agent itself can book tickets, clean inboxes, pay bills, post on social media, and update spreadsheets.

Privacy and security are foundational. All user data and AI chat conversations are end-to-end encrypted, preventing third-party interception. Critical data stays local, minimizing the amount of sensitive information that leaves the device. The browser enforces TLS 1.3, HTTPS, and DNS-over-HTTPS for secure connections, includes a built-in ad blocker, and offers real-time phishing detection. Private profiles are secured using blockchain cryptography: a 12-word mnemonic phrase creates a portable, encrypted identity that separates work, personal, and guest browsing. Sigma is also Web3-ready, enabling users to connect to decentralized applications, manage wallets, and interact with blockchain networks directly in the browser. As an open-source project, the code is public for security review, and it is fully compliant with GDPR and CCPA.

Designed for professionals, researchers, developers, and everyday users, Sigma AI Browser is available on macOS, Windows, iOS, and Android, with a Linux version planned. By combining agentic automation, local-first AI, and enterprise-grade privacy into a lightweight browser, Sigma offers a practical solution for users who demand both productivity and data control. Whether it is conducting deep market research, automating online workflows, preserving privacy in AI interactions, or securely navigating the decentralized web, Sigma positions itself as a comprehensive, privacy-first tool for the next generation of web browsing.

Core capabilities

AI Agent

Automates end-to-end browser tasks — navigating pages, filling forms, managing tasks, and completing goals from a simple prompt.

Eclipse Local LLM

Runs a private offline model directly in the browser, keeping data on-device with no cloud processing.

Deep Research Mode

Queues multiple sources, clusters information, and generates structured insights for market, academic, or technical research.

Unified AI Chat

Ask questions, perform deep research, generate images, and create text from one AI-powered interface.

Chat with Page

Convert any website into a conversation to ask questions and get instant summaries without leaving the page.

Blockchain Private Profiles

Create encrypted, portable profiles secured by a 12-word mnemonic phrase using blockchain cryptography.

End-to-End Encryption

Protect all user data and AI chats with encryption, plus TLS 1.3, HTTPS, and DNS-over-HTTPS by default.

Built-in Ad Blocker

Automatically filters intrusive ads for a cleaner, faster, and less distracting browsing experience.

Web3 Integration

Connect to dApps, manage wallets, and interact with blockchain networks directly in the browser.

Quick Translate

Instantly translate any highlighted sentence into another language for seamless multilingual browsing.

Use cases

Automating online bookings, bill payments, and inbox cleanup through the AI agent.

Conducting deep web research with queued sources and structured insight generation.

Offline AI summarization and Q&A with a local LLM to keep sensitive data on-device.

Interacting with decentralized applications and managing crypto wallets securely.

Translating and summarizing web content in real time during multilingual browsing.

Managing multiple work and personal profiles with isolated, encrypted browsing sessions.

Blocking ads and enhancing page performance while using browser extensions and existing workflows.