Nullgen AI Blocker
Stop AI prompts from being typed on any website.
What it does
Nullgen is a free, on-device browser extension that blocks generative AI prompts. Detection runs on the device, so what you type never leaves your computer. It works in Chrome, Edge, Firefox, and Safari, on ChatGPT, Claude, Gemini, and any site with an AI composer. Use it to prevent AI cheating, promote academic integrity, stop shadow AI, or prevent data loss. Pro tier adds management features such as access approvals, policies, provisioning and enforcement for families, schools, and companies.
Nullgen is a free, on-device browser extension that blocks generative AI prompts. Protect sensitive data at work, ensure academic integrity, or secure home PCs.
Most AI controls react to what already happened. Nullgen AI Blocker prevents those AI prompts from happening in the first place. You get immediate prevention, not damage control afterward. Works in Chrome, Edge, Firefox, and Safari. No account, no sign-up, no cost. Detection happens locally in the browser. Your prompt is never uploaded to us. Install and you are protected. Nothing to configure, nothing to sign up for. Prompt blocking is free, permanently. Pro is optional and adds extra control and features. Domain blocklists break the moment a new assistant launches, and monitoring tools only tell you about the essay, the leaked snippet, or the pasted customer list after it is gone.…from nullgen.ai
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