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Sigma Browser

Sigma is a private AI browser with built-in AI agent and ad blocker.

Checked 4 Oct 2026 Reviewed by Alex Listed since January 2025

Screenshot of Sigma Browser

At a glance

Starts at $8 per month -20% Price as published by the vendor, September 2026.
Free tier Yes, limited
Platforms Web, macOS, Windows
Best for Developers, privacy-conscious users

4.0 out of 5

Scored by Alex after real use

Our verdict

Sigma offers fast browsing and local AI. Great for those who value privacy but lacks some advanced features of bigger players like ChatGPT Atlas or Chrome.

✓What it does well

Fast1.32x faster than ChatGPT Atlas in benchmark tests.
Private AIData stays local; no cloud processing, enhancing privacy and speed.
Ad BlockerFilters out intrusive ads for a cleaner browsing experience.

✕Where it falls short

Limited features in free planFree version limits access to AI Agent, Deep Research and more.
No advanced search capabilitiesChat With Page does not support complex searches compared to competitors.
Higher RAM usage in Pro planPro version consumes more memory, potentially slowing down your system.

Key features

AI AgentHandles tasks and navigates pages on behalf of the user.
Web3 IntegrationConnects to decentralized apps directly from browser.
Privacy FirstEnd-to-end encryption prevents third-party access or interception of data.
Web3 InteractionsConnect to decentralized apps directly.

Questions about Sigma Browser

What is Sigma Browser?

Sigma Browser is a private AI browser with a built-in AI agent and an ad blocker. The agent handles tasks and navigates pages on the user's behalf, data stays local with no cloud processing, and the browser connects directly to decentralized apps through Web3 integration.

How much does Sigma Browser cost?

Sigma Browser has a limited free tier at $0, and paid use starts at $8 per month. The reviewer notes that the free version limits access to the AI Agent, Deep Research and more, so the full feature set needs the paid plan.

Is Sigma Browser faster than ChatGPT Atlas?

The reviewer reports Sigma Browser as 1.32x faster than ChatGPT Atlas in benchmark tests. Keeping data local, with no cloud processing, is credited with improving both privacy and speed. The verdict still notes it lacks some advanced features of bigger players like ChatGPT Atlas or Chrome.

What are the downsides of Sigma Browser?

The reviewer names three limits. The free plan restricts the AI Agent, Deep Research and other features, Chat With Page does not support complex searches the way competitors do, and the Pro version uses more RAM, which can slow a system down.

Which platforms does Sigma Browser support?

Sigma Browser runs on the web, macOS and Windows. Toolio recommends it for developers and privacy-conscious users, and the vendor says its end-to-end encryption prevents third-party access to data. Alex scored it 4.0 out of 5 after real use.

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