SAN FRANCISCO, CA — December 19, 2025 — Leads & Copy — Sigma Browser has launched Sigma Eclipse, a private, AI-powered browser featuring a fully cloudless large language model (LLM). The browser update introduces a new method of interacting with the web, where artificial intelligence operates locally on the user’s device, rather than relying on remote servers.
Unlike traditional AI-enabled browsers that process tasks in the cloud, Sigma Eclipse runs locally on the user’s computer, ensuring that personal data, browsing history, credentials, and task-related information never leave the device. Users can work with AI-assisted features without exposing sensitive information to external infrastructure.
Sigma’s local execution engine allows the AI chat to function offline, reinforcing transparency around how data is handled. The browser’s codebase is open-source, enabling independent review and verification, designed to eliminate hidden behaviors, undisclosed data flows, or backdoors often impossible to audit in closed systems.
“At some point, privacy stopped being a setting and became a marketing term,” said Alex Shapiro, CSO of Sigma Browser. “With Sigma Eclipse, we wanted to make privacy verifiable rather than promised. When the AI runs on your own machine and doesn’t require an internet connection, users can see for themselves that their data stays exactly where it belongs.”
Sigma Eclipse includes an unfiltered language model with no ideological or content-based restrictions on user queries or responses. According to Sigma, users should retain full control over interacting with AI tools without imposed limitations on topics or perspectives.
The update also introduces local PDF processing, allowing users to analyze and work with documents directly on their device. Sensitive files are never uploaded to external servers, making the feature suitable for professional, legal, financial, or personal documents that require strict confidentiality.
“AI has become incredibly powerful, but it has also become centralized and expensive,” said Nick Trenkler, cofounder of Sigma Browser. “We believe users shouldn’t have to trade privacy or pay ongoing cloud costs to access advanced AI. By keeping everything local, we’re able to offer a private LLM that’s free to use and free from surveillance.”
Because Sigma Eclipse operates without cloud infrastructure, the company states there are no associated cloud-processing costs. The local LLM is available to users for free, with no subscription required for core functionality.
The release is a step toward a transparent and user-controlled AI ecosystem, where performance, privacy, and accessibility are not mutually exclusive. The company believes local-first AI models represent a viable alternative to cloud-dependent systems, particularly as concerns around data security, ownership, and long-term costs continue to grow.
Contacts:
Nick Trenkler, cofounder
nicktr@sigmabrowser.com
Source: SigmaBrowser
