Nullgen AI BlockerHow to block Chai
How to block Chai on every device
Chai is an AI chat app for talking to community-created characters and companions. Below: how to block Chai in the browser, on phones and tablets, on your home or school network, and on managed devices.
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Chai
AI companions and roleplay
chai-research.comBlocked3 hostnames in the Nullgen catalog
Every entry also covers its subdomains, so the Chai app and API are blocked too.
What Chai connects to
These are the hostnames Chai uses for its website, its apps, and its API. Each entry is matched as a suffix — blocking chai-research.com also blocks every subdomain of it — so the Chai app cannot slip through on a hostname that is not listed. Shared hosts that other products need are deliberately left out.
| Hostname | Role |
|---|---|
| chai-research.com | Main website |
| chai.ml | App, API, or content host |
| chaiapp.com | App, API, or content host |
Block Chai in the browser
Free: the Nullgen browser extension
The free extension blocks Chai 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 Chai 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": [
"chai-research.com",
"chai.ml",
"chaiapp.com"
]
}Firefox — policies.json
{
"policies": {
"WebsiteFilter": {
"Block": [
"*://chai-research.com/*",
"*://*.chai-research.com/*",
"*://chai.ml/*",
"*://*.chai.ml/*",
"*://chaiapp.com/*",
"*://*.chaiapp.com/*"
]
}
}
}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 Chai app on phones and tablets
Nullgen mobile app
The Nullgen app blocks Chai 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 Chai in Safari and in apps that use Apple’s web filter.
- 2Under Web Content, choose Limit Adult Websites — the setting that lets you deny chai-research.com by name.
- 3Under Never Allow, add chai-research.com. Safari and apps that use Apple’s web filter will refuse it.
- 4To keep the Chai 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 Chai can be blocked by site.
- 2Choose Only allow approved sites, or add chai-research.com under Blocked sites.
- 3Under Controls → App limits, block the Chai app, or require approval for new installs from Google Play.
Block Chai on your home or school network
A DNS blocker such as Pi-hole, AdGuard Home, NextDNS, or pfBlockerNG blocks Chai for every device on the network — laptops, phones, consoles, and the Chai app — without installing anything on them. Subscribe to the Chai file from the public blocklist, or paste the rules directly.
Subscribe to the Chai list
AdGuard Home, uBlock Origin, and Brave rules
||chai-research.com^
||chai.ml^
||chaiapp.com^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 Chai on managed devices
Schools and companies can block Chai 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 Chai
Does the free Nullgen extension block Chai?
Yes. The free extension blocks prompts on Chai 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 Chai break other websites?
No. Every hostname on this page belongs to Chai 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 Chai block?
A browser-only block can be bypassed with another browser or the Chai 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 Chai 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 Chai 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.
Block Chai today
Start with the free browser extension. Add Nullgen Pro when you need the Chai app blocked on phones, tablets, and desktops, with approvals for the people who really need it.