Tracking across subdomains

If your product lives on more than one subdomain, such as example.com, app.example.com and blog.example.com, you can track them in one Muro project or in separate ones. This page explains how each option counts, so you can pick the one that fits.

How Muro counts across subdomains

The snippet identifies a project by its data-project-id, not by domain, so the same snippet works on any subdomain. Three things to know:

• Visitors are counted per subdomain. Muro keeps its daily salt and session in browser storage, and browsers keep that storage separate for each origin. The same person on blog.example.com and then app.example.com counts as two visitors.
• Sessions don't cross subdomains. Moving from blog to app starts a new session, so it appears as two sessions in Sessions.
• The other subdomain shows up as a referrer. Muro only ignores referrers that match the current hostname exactly. A visitor who clicks from blog.example.com to app.example.com shows blog.example.com as the referrer on the app.

www.example.com and example.com are separate origins too. If both serve your site, redirect one to the other so all visits land on a single hostname.

Muro can't link one visitor's identity across subdomains.

Option 1: one project for everything

Use the same snippet, with the same project ID, on every subdomain.

Good for: a combined total of traffic to your whole product, with one dashboard and one daily digest.

Keep in mind:

• Muro records the path of each page, not its hostname. /pricing on example.com and /pricing on app.example.com are reported as the same page. Goals match on paths too.
• Visitors and sessions add up across subdomains, so the same person can be counted more than once.

This works best when each subdomain uses different paths, for example a marketing site at /, /pricing and /blog/... and an app at /dashboard/....

Option 2: one project per subdomain

Create a separate project for each subdomain and install each project's own snippet. To add one, use the project switcher → New project. There's no limit on websites on any plan.

Good for: separate numbers for your marketing site, app and blog, with pages and goals that never collide.

Keep in mind: there's no combined total. Use Overview to see every project side by side.

Set it up

Verify it works

1. Open a page on each subdomain with DevTools → Network filtered to collect. Each one sends a POST to https://cdn.muroanalytics.com/collect with status 202.
2. Check the project_id in each request's Payload matches the project you intended.
3. Set the dashboard time range to Live. Visits from each subdomain appear within a minute or so.

Next steps