# Install the Revnu Tag
> One script tag that tells Revnu where your visitors come from, including ChatGPT, Perplexity and other AI assistants, search engines and ads.
Canonical: https://revnu.com/docs/revnu-tag
The Revnu Tag is a small first-party script for your site. On every visit it records where the visitor came from: an AI assistant (ChatGPT, Perplexity, Claude, Gemini, Copilot, Grok), a search engine, an ad click, another site, or a direct visit. Pair it with the [Event API](/docs/event-api) to tie signups, bookings and payments back to that source.
## The tag
```html
```
Your site key starts with `rk_`. Revnu gives it to you when measurement is set up for your account; ask your Revnu contact if you don't have one. Install the tag once, on every page.
## Plain HTML
Paste the line into the `` of your shared layout or template. Site builders work the same way:
- **WordPress:** your theme's header, or a header-scripts plugin.
- **Webflow:** Project Settings → Custom Code → Head Code.
- **Framer:** Site Settings → Custom Code → Start of ``.
## Google Tag Manager
1. **Tags → New → Custom HTML**, and paste the line.
2. Set the trigger to **All Pages**.
3. Save, then **Submit** to publish the container.
Use Tag Manager or a hard-coded tag, not both.
## Next.js and Vercel
Add it to your root layout with `next/script`:
```tsx
// app/layout.tsx
import Script from "next/script";
export default function RootLayout({ children }: { children: React.ReactNode }) {
return (
{children}
);
}
```
On the Pages Router, put the same `