

Sigma AI Browser is a next-generation web browser engineered for the AI era — combining intelligent assistance, uncompromising privacy, blistering speed, and transparent pricing. At its core lies SigmaGPT, a purpose-built, on-device AI engine that powers real-time chat, content creation, webpage summarization, and contextual research — all without sending your data to remote servers.
Unlike traditional browsers with add-on AI extensions, Sigma integrates intelligence natively — delivering seamless performance, end-to-end encryption, and zero-tracking browsing. Its lightweight architecture ensures faster page loads, lower memory usage, and extended battery life — making it ideal for professionals, students, and privacy-conscious users alike.
1. Download the latest version from sigmabrowser.com/download
2. Launch the browser and click the glowing Sigma icon in the top-right toolbar to launch SigmaGPT
3. Ask anything — summarize an article, compare products, translate text, or brainstorm ideas — instantly and securely
For technical help, billing inquiries, or refund requests, visit our Contact Us page or email [email protected]. Our team typically responds within 12 business hours.
Sigma AI Browser is developed by Sigma Labs Inc., an independent software company headquartered in Berlin, Germany.
Company address: Kaiserstraße 32, 10777 Berlin, Germany.
Learn more about our mission, values, and open-source contributions on the About Us page.
Access your synced settings and AI history: Login Portal
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“Finally, an AI browser that doesn’t trade my privacy for convenience. SigmaGPT feels like having a research assistant built into every tab.”
— Maya T., Product Designer ★★★★★ (Trustpilot)
“Faster than Chrome, smarter than Edge, and infinitely more respectful of my data. Worth every penny of the Pro subscription.”
— David L., Academic Researcher ★★★★★ (Product Hunt)
It’s the only mainstream browser that runs SigmaGPT locally by default — meaning your prompts, browsing context, and generated content never leave your device unless you explicitly choose otherwise. Combined with a lean, privacy-hardened codebase, it delivers true AI empowerment *without* surveillance.
Yes — the core browser and full SigmaGPT functionality are completely free forever. The optional Pro tier enhances productivity with features like multi-step AI agents, custom prompt libraries, and encrypted cloud sync — but none are required to experience AI-powered browsing at its best.
The lightweight SigmaGPT Lite model runs entirely offline for basic tasks (chat, summarization, translation). For advanced reasoning or large-context generation, an internet connection enables optional cloud acceleration — always with clear user consent and encryption.