StackPulse detects Varnish on 4,665 websites — 4.05% of the 115,150 domains in the index — making it the #4 infrastructure technology we track. Updated October 27, 2026.
StackPulse currently detects Varnish on 4,665 websites, which is 4.05% of the 115,150 domains in the index. The count is refreshed as the crawler re-scans the web.
How do I check whether a website uses Varnish?
Open the free StackPulse lookup, enter the domain and the infrastructure section will list Varnish if its scripts, headers or markup are present. Developers can call GET /v1/lookup/:domain.
Can I download a list of websites that use Varnish?
Yes. Lead Export filters the index by Varnish (optionally combined with other technologies) and streams the matching domains as CSV, up to 50,000 rows per file.
What is Varnish?
Varnish is a infrastructure technology. It ranks #4 of 7 infrastructure technologies by number of websites in the StackPulse index.
Look up any domain by API
One call returns the ecommerce platform, payment gateways, marketing pixels and infrastructure. Results are cached for a week.