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loc.gov

https://loc.gov

C71
Performance 50Accessibility 81SEO 100Best Practices 100

20 technologies detected · Last audited Apr 16, 2026

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Technology stack

Analytics

Adobe Analytics Adobe Experience Platform Launch

Cdn

Amazon S3 Cloudflare

Ecommerce

Fourthwall

Frontend

Adobe Client Data Layer Google Search Console HSTS Isotope Masonry MediaElement.js Microsoft Modernizr Open Graph Proofpoint Sentry ServiceNow jQuery jQuery UI

Hosting

Amazon Web Services

Frequently asked questions about loc.gov

What technology does loc.gov use?

loc.gov is built with Fourthwall, Adobe Client Data Layer, Google Search Console, HSTS, and Isotope.

Is loc.gov fast?

Somewhat — loc.gov scores 50/100 on Lighthouse mobile performance, below the median audited site.

Is loc.gov accessible?

Mostly — loc.gov scores 81/100 on Lighthouse accessibility, with a handful of automated issues to address.

What CMS does loc.gov use?

No CMS fingerprint was detected on loc.gov — it may use a static site generator or a custom application.

Where is loc.gov hosted?

loc.gov is hosted on Amazon Web Services.

Does loc.gov use HTTPS?

Yes — loc.gov serves traffic over HTTPS.

1 audits

Apr 16, 2026 17:49 UTC Latest

/

Worker: worker-newyork-us-01

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Scores

Performance 50Accessibility 81Best Practices 100SEO 100PWA 0

Timing

LCP: 47.89 sFirst Contentful Paint: 6.84 sTTFB: 49 msTotal Time: 49 msCumulative Layout Shift: 0.000

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