Nullgen AI Blocker

Blocks text input into AI prompts, on-device.

Stop generative AI data leaks and enforce usage policies before a prompt is ever submitted. Nullgen AI Blocker is a lightweight, zero-configuration browser extension that intercepts and blocks generative AI prompts directly at the keyboard level. Whether you are an enterprise securing proprietary company data, an educator enforcing academic integrity, or a parent managing household screen habits, Nullgen provides real-time protection without compromising browser performance. Core Features (Free) Real-Time Prompt Interception: Instantly blocks flagged text inputs on generative AI interfaces (like ChatGPT, Claude, and Gemini) using a seamless in-line frosted glass overlay. 100% On-Device Processing: Your text never leaves your computer. Nullgen analyzes prompts locally to guarantee total privacy. Live Impact Metrics: Track your daily and all-time blocked prompts directly from the extension popup. Zero-Account Required: Install and instantly start protecting your data with a global master toggle. Nullgen Premium (For Families, Educators, and Enterprises) Upgrade to a managed plan to unlock centralized policy control and advanced reporting: Centralized Policy Management: Deploy custom prompt filters, blocked keywords, and daily usage limits across multiple devices from a secure web dashboard. Permission Request Workflows: Users can request temporary or permanent access for specific prompts directly through the blocked UI, routing instantly to an assigned admin or parent for approval. Enterprise MDM Provisioning: Automatically deploy policies and enroll fleet devices via standard Mobile Device Management (MDM) tools. Secure Manual Provisioning: Easily link client devices using time-limited, 6-character single-use setup codes—keeping admin credentials entirely off end-user machines. Privacy First by Design Nullgen is built on the principle of zero-trust data collection. The core extension operates entirely locally. Your prompt history and keystrokes are never stored, transmitted, or analyzed on external servers.