Our browser extension stops AI prompts before they are ever sent. On phones and desktops, we stop known AI apps and sites from loading at all. One suite for every device your family, classroom, or company uses.
AI blocker suite for browsers, desktop, and mobile
One suite, every device
The extension stops AI prompts in the browser. The apps stop known AI apps and sites from loading on phones and desktops. One Pro account manages all of them.
Blocks typing and pasting into AI prompts on any website. Free forever, no account, everything on-device.
Stops known AI apps and websites from loading on the phone or tablet, in every browser and in the apps themselves.
Will stop known AI apps and websites across the whole Mac or Windows computer, including desktop AI apps the extension cannot see.
Two kinds of blocking
A browser has a prompt box to hook; a phone or a desktop app does not. So the extension blocks the prompt, and the apps block the destination.
Chrome, Edge, Firefox, and Safari
The extension recognizes AI prompt boxes on any website and stops typing and pasting into them.
iPhone, iPad, Android, macOS, and Windows
The apps stop known AI apps and websites from loading on the whole device, in every browser and in the apps themselves.
Blocks the tools people actually use
All blocking guidesRuns on device
Detection and blocking happen on the device itself. Prompts and browsing are never uploaded to us.
No network changes
No proxy, no certificates, no DNS rules. Install it and it works in a minute.
Always up to date
New AI tools are covered automatically, in the browser and in the apps.
Who it’s for
Parents, teachers, and IT teams run the same suite for different reasons. Pick yours.
Pro
Everything in the free extension stays free. Pro is for people who need to manage more than their own browser, and it includes the mobile and desktop apps.
Add the users you manage, choose their approvers, and enroll their computers, phones, and tablets.
Users can ask for AI access. Approvers can approve or deny requests.
Policy changes reach enrolled browsers and apps as they are saved, without waiting for a restart.
Force-install on managed browsers and pin it so it cannot be turned off or uninstalled.
Short answers on the free extension, the apps, and privacy.
Neither. Prompt blocking in the browser is the free product and stays free. Pro adds the admin portal, fleet management, and the mobile and desktop apps on top.
No. Detection runs in the browser and prompt text is not sent to us. The apps block on the device and never send what you browse to us. The free extension has no account, so there is nothing tied to you.
No. The extension finds AI prompt boxes on any website, including new assistants, and leaves the rest of the page usable. The apps block a growing list of known AI apps and sites on the whole device.
Yes. The Nullgen app for iPhone, iPad, and Android blocks known AI apps and websites on the device and links to the same Pro dashboard as the extension.
The browser extension only sees the browser. macOS and Windows agents that block known AI apps and sites across the whole computer are coming soon, and they will be included with Nullgen Pro.
Only English websites are supported today. We plan to support other languages in the future.
Yes. The browser extension, the mobile app, and the desktop app can all be uninstalled. Nullgen Pro adds enforcement to pin the extension and apps, alongside OS-level family and enterprise controls.
It takes a minute to install, with no account and no commitments. Add the apps and the dashboard with Pro when you need them.
Nullgen AI Blocker
Chrome
Edge
Firefox
Safari