Sigma

Sigma is a private AI browser with built-in AI chat, a browser agent, and local AI for browsing, research, and task automation.

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Private AI browser with local and browser-based assistants

Sigma is a private AI browser built around three main functions: browsing, AI chat, and an AI agent. The site presents it as a Chromium-based browser with local AI, privacy features, and built-in tools for everyday web work.

Its AI agent can act on web pages by navigating sites, filling forms, and managing tasks, while Sigma AI Chat handles questions, research, image generation, and text creation. Sigma also includes Eclipse, a local LLM that runs inside the browser so prompts and sensitive data stay on the device when using local AI features.

Features

Browser task automation

Sigma AI Agent can navigate pages, click, type, read web content, and help complete browser tasks from start to finish.

Chat, research, and creation

Sigma AI Chat supports questions, deep research, image generation, and text creation in one place.

On-device local AI

Eclipse is a local LLM built into the browser so prompts stay on the device instead of being sent to servers.

Privacy and security protections

Sigma keeps critical data local, encrypts user data and chat conversations, and includes prompt-injection defense and phishing warnings.

Everyday browsing tools

Sigma includes a built-in ad blocker, page chat, quick translation, and support for browser extensions.

Profile and workflow separation

The browser supports private profiles, Web3 integration, and separate spaces for work and personal browsing.

Use cases

Automate web workflows
Use the browser agent to work through multi-step site flows such as filling forms, clicking through pages, or handling repetitive browser tasks.
Research and synthesis
Use Sigma AI Chat or Deep Research to compare sources, summarize articles, and organize findings into clear answers.
Private on-device AI
Use Eclipse or Private Mode when you want local AI processing and prefer prompts or sensitive material to stay on your device.
Read and translate pages in place
Use page chat and quick translation to understand content in context without switching between tabs or separate tools.
Separate browsing and work contexts
Use private profiles, extensions, ad blocking, and Web3 support to keep browsing separated and tailored to different contexts.

Pros and Cons

Pros

Combines browsing, AI chat, deep research, and agent tasks in one browser.
Offers a local AI option through Eclipse and Private Mode for on-device workflows.
Includes privacy-oriented features such as local data handling, encryption, and phishing warnings.
Supports practical browsing tools like ad blocking, page chat, quick translation, and extensions.
Provides both standard browser use and AI-assisted actions without leaving the page.

Cons

Pricing details are limited in the source beyond a free chat tier and paid Plus and Pro plans on the plans page.
The site mentions Windows, iOS, and Android availability, but Linux is still listed as coming soon.

FAQ

What is Sigma?

Sigma is a private AI browser that combines browsing with AI chat, an AI agent, and local AI features inside the browser.

What can Sigma AI Agent do?

The source indicates Sigma AI Agent can navigate pages, click, type, read web content, and help complete tasks across websites. It supports standard browsing with an API key or local models in Private Mode.

What is Sigma AI Deep Research used for?

Sigma AI Deep Research searches across sources, reads key information, and turns research results into clear, organized answers inside AI Chat.

What platforms does Sigma support?

Sigma lists Windows, iOS, and Android availability, with macOS and Windows download buttons shown on the site and Linux noted as coming soon.

Does Sigma support local AI?

The site says Sigma supports Private Mode for local models in the agent and runs a local LLM called Eclipse for on-device AI, while also showing AI features in the browser.

Quick Facts

Category: AI Browser
Primary functions: AI chat, browser agent, deep research, local AI
Platform support: macOS, Windows, iOS, Android; Linux coming soon
Core browser base: Chromium
Domain: sigmabrowser.com
Pricing signal: Free chat tier plus Plus and Pro plans listed