Sigma

Sigma AI Browser is an AI-powered, privacy-focused web browser for content creators, professionals, marketers, developers, and teams that want chat, research, and automation built into everyday browsing.

Key capabilities include:

• Browser-based AI agent that can log into sites and complete multi-step workflows from plain-language instructions, including bookings and checkout, data extraction to spreadsheets, inbox clean-up, calendar actions, CRM/data entry, and social posting (public beta for the autonomous agent is scheduled for August 2025).
• AI chat and page assist (SigmaGPT) for asking questions, generating content, and summarizing webpages, with support for multiple models (including GPT-4.1 and Gemini).
• Deep Research that searches journals, datasets, and expert sources to produce structured, citation-rich insights for market analysis and academic-style research.
• Privacy and security tools such as end-to-end encrypted AI conversations, no user profiling, ad blocking, built-in VPN, phishing protection, plus an offline local LLM (Sigma Eclipse) for on-device AI chat.

Pricing: Freemium, with a free tier and paid plans for advanced agentic capabilities.

What makes it notable is the combination of agentic browsing (actions taken inside real websites) with offline AI via a local LLM and browser-level privacy protections, positioning it as an alternative to traditional Chromium-based browsers paired with separate AI assistants and automation extensions.