What it reads
The hosts outside your own domain that your home page loads scripts and stylesheets from.
Check 53 of 54 · Supply chain
Third-party code, explained.
The outside hosts whose code runs in your visitors' browsers.
Engine 1.57.0, read 25 October 2026
Free checkContextReliability: High
Whose code runs on your website?
What the check does, and where it stops.
Why it matters
Whatever each outside host serves is loaded into your visitors' browsers as part of your site.
What it shows
It is context: background only. It is never graded, so nothing it finds lowers your score.
Where its limits are
An inventory of the page as served, never graded. Code that a script adds once the page loads, such as a tag manager's, is not listed. Some hosts may be your own under another name.
ReliabilityHigh: narrow, known blind spots
Check 53 is one of 4 in Supply chain. See it in its row on the scanner page, beside the rest of Supply chain.
See how your domain does.
The free check includes this one and takes about 30 seconds. No account. Nothing to install.