Track visitors across different domains

Track visitors as they move between different root domains, such as example.com and myapp.io, as one journey.

Subdomains need nothing: app.example.com and blog.example.com are already part of example.com, and the cookie script shares its visitor across them.

When to use it

• A marketing site on example.com and the app on myapp.io
• A store on its own domain next to your main site
• Several brand domains that share customers

Set it up

1. In your site's Settings → Additional domains, add the other domains (for example myapp.io). Events from them are accepted from then on.
2. Install the script on every domain with the same site ID, and list the other domains in data-allowed-hostnames:

<script
  defer
  data-website-id="YOUR_SITE_ID"
  data-allowed-hostnames="myapp.io"
  src="https://usedatasense.com/js/script.cookies.js"
></script>

data-allowed-hostnames is a comma-separated list of your other domains, without the one the page is on.

How it works

When a visitor clicks a link to one of those domains, the script adds _ds_vid and _ds_sid to the link, and the script on the other side continues the same visitor and session, then removes the parameters from the address bar.

Allow all domains

Allow all domains accepts events from any domain. Use it for embedded widgets or customer-owned domains you can't list in advance.