Nullgen AI BlockerHow to block Gamma
How to block Gamma on every device
Gamma is an AI presentation and document maker that turns a prompt into a finished slide deck. Below: how to block Gamma in the browser, on phones and tablets, on your home or school network, and on managed devices.
AI blocker suite for browsers, desktop, and mobile
Chrome
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Gamma
Slides and diagrams
gamma.appBlocked1 hostname in the Nullgen catalog
Every entry also covers its subdomains, so the Gamma app and API are blocked too.
What Gamma connects to
These are the hostnames Gamma uses for its website, its apps, and its API. Each entry is matched as a suffix — blocking gamma.app also blocks every subdomain of it — so the Gamma app cannot slip through on a hostname that is not listed. Shared hosts that other products need are deliberately left out.
| Hostname | Role |
|---|---|
| gamma.app | Main website |
Block Gamma in the browser
Free: the Nullgen browser extension
The free extension blocks Gamma and every other tool in the catalog in Chrome, Edge, Firefox, and Safari. It works on the page itself — no DNS change, no policy — and updates as the catalog grows.
Managed browsers: block the sites by policy
On a school or company fleet, push the hostnames as a browser policy so Gamma is blocked even when someone uninstalls extensions. These snippets use the official Chrome, Edge, and Firefox policy names and the same hosts listed above.
Chrome and Edge — URLBlocklist
{
"URLBlocklist": [
"gamma.app"
]
}Firefox — policies.json
{
"policies": {
"WebsiteFilter": {
"Block": [
"*://gamma.app/*",
"*://*.gamma.app/*"
]
}
}
}Chrome and Edge treat a bare hostname as the host plus every subdomain. Firefox needs both the apex and the wildcard pattern.
Need every AI tool in one file, or a .reg or macOS profile?
Open the free policy generatorBlock the Gamma app on phones and tablets
Nullgen mobile app
The Nullgen app blocks Gamma and 100+ other AI apps and sites on the whole device with an on-device filter — the app, the website, and the API, on any network, with no DNS server to run. Included with Nullgen Pro.
Without Nullgen: Screen Time on iPhone and iPad
- 1Open Settings → Screen Time → Content & Privacy Restrictions and turn restrictions on. This covers Gamma in Safari and in apps that use Apple’s web filter.
- 2Under Web Content, choose Limit Adult Websites — the setting that lets you deny gamma.app by name.
- 3Under Never Allow, add gamma.app. Safari and apps that use Apple’s web filter will refuse it.
- 4To keep the Gamma app off the device entirely, delete it and set Installing Apps to Don’t Allow, or use Ask to Buy on a child’s Apple Account.
Without Nullgen: Family Link on Android
- 1Open Family Link, choose the child, then Controls → Content restrictions → Google Chrome — where Gamma can be blocked by site.
- 2Choose Only allow approved sites, or add gamma.app under Blocked sites.
- 3Under Controls → App limits, block the Gamma app, or require approval for new installs from Google Play.
Block Gamma on your home or school network
A DNS blocker such as Pi-hole, AdGuard Home, NextDNS, or pfBlockerNG blocks Gamma for every device on the network — laptops, phones, consoles, and the Gamma app — without installing anything on them. Subscribe to the Gamma file from the public blocklist, or paste the rules directly.
Subscribe to the Gamma list
AdGuard Home, uBlock Origin, and Brave rules
||gamma.app^DNS blocking cannot see inside a VPN or a phone on mobile data. For a block that follows the device, use the Nullgen apps or an MDM profile.
Block Gamma on managed devices
Schools and companies can block Gamma on every managed iPhone, iPad, laptop, and Chromebook from the MDM they already run — Intune, Jamf, Kandji, or Google Workspace — with per-person policies and an approval flow for legitimate use. Nullgen Pro provides the profiles and the dashboard; these guides walk through the setup.
Questions about blocking Gamma
Does the free Nullgen extension block Gamma?
Yes. The free extension blocks prompts on Gamma and every other AI tool in the catalog in Chrome, Edge, Firefox, and Safari. It works on the page itself, so it needs no policy and no DNS change.
Will blocking Gamma break other websites?
No. Every hostname on this page belongs to Gamma alone. Shared websites that other products depend on are never on the list — which is also why AI features built into those products stay reachable.
Can someone get around a Gamma block?
A browser-only block can be bypassed with another browser or the Gamma app, and a network block can be bypassed with a VPN or a phone on mobile data. A block on the device itself — the Nullgen apps, Screen Time, or an MDM profile — follows the device wherever it goes.
Does this block the Gamma app, not just the website?
A DNS or device-level block does. The app talks to the same hostnames listed above, and every entry covers its subdomains, so the app cannot slip through on a hostname that is not listed. A browser policy or extension only covers the browser.
What happens when Gamma adds a new hostname?
The catalog is updated as vendors change, and the Nullgen apps, the extension, and the public blocklist all read from it, so a new hostname reaches every device without anyone editing a list by hand.
More slide and diagram tools
Block Gamma today
Start with the free browser extension. Add Nullgen Pro when you need the Gamma app blocked on phones, tablets, and desktops, with approvals for the people who really need it.