Nullgen AI BlockerHow to block Napkin
How to block Napkin on every device
Napkin turns written text into diagrams and visuals with AI, popular for decks and reports. Below: how to block Napkin in the browser, on phones and tablets, on your home or school network, and on managed devices.
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Napkin
Slides and diagrams
napkin.aiBlocked1 hostname in the Nullgen catalog
Every entry also covers its subdomains, so the Napkin app and API are blocked too.
What Napkin connects to
These are the hostnames Napkin uses for its website, its apps, and its API. Each entry is matched as a suffix — blocking napkin.ai also blocks every subdomain of it — so the Napkin app cannot slip through on a hostname that is not listed. Shared hosts that other products need are deliberately left out.
| Hostname | Role |
|---|---|
| napkin.ai | Main website |
Block Napkin in the browser
Free: the Nullgen browser extension
The free extension blocks Napkin 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 Napkin 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": [
"napkin.ai"
]
}Firefox — policies.json
{
"policies": {
"WebsiteFilter": {
"Block": [
"*://napkin.ai/*",
"*://*.napkin.ai/*"
]
}
}
}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 Napkin app on phones and tablets
Nullgen mobile app
The Nullgen app blocks Napkin 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 Napkin in Safari and in apps that use Apple’s web filter.
- 2Under Web Content, choose Limit Adult Websites — the setting that lets you deny napkin.ai by name.
- 3Under Never Allow, add napkin.ai. Safari and apps that use Apple’s web filter will refuse it.
- 4To keep the Napkin 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 Napkin can be blocked by site.
- 2Choose Only allow approved sites, or add napkin.ai under Blocked sites.
- 3Under Controls → App limits, block the Napkin app, or require approval for new installs from Google Play.
Block Napkin on your home or school network
A DNS blocker such as Pi-hole, AdGuard Home, NextDNS, or pfBlockerNG blocks Napkin for every device on the network — laptops, phones, consoles, and the Napkin app — without installing anything on them. Subscribe to the Napkin file from the public blocklist, or paste the rules directly.
Subscribe to the Napkin list
AdGuard Home, uBlock Origin, and Brave rules
||napkin.ai^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 Napkin on managed devices
Schools and companies can block Napkin 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 Napkin
Does the free Nullgen extension block Napkin?
Yes. The free extension blocks prompts on Napkin 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 Napkin break other websites?
No. Every hostname on this page belongs to Napkin 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 Napkin block?
A browser-only block can be bypassed with another browser or the Napkin 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 Napkin 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 Napkin 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.
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Block Napkin today
Start with the free browser extension. Add Nullgen Pro when you need the Napkin app blocked on phones, tablets, and desktops, with approvals for the people who really need it.