Prismic Detector
Paste any URL and instantly see whether the site is built with Prismic — with the matched evidence.
We do not store the URL you audit. Want the full audit (performance / images / SEO / accessibility + real-browser speed test)? → run the full audit
Why check this
On Prismic sites, images and slices come from the CMS — most performance and SEO issues live in that layer. Confirming the platform tells you where to fix.
What this is
Prismic is a headless CMS built around slices, custom types and a media CDN at images.prismic.io / *.cdn.prismic.io. Content brands and multilingual sites let editors reorder slices without a deploy. Confirming Prismic tells you whether LCP fixes belong in CMS image fields or in the front-end image component, and whether API payloads need caching. Preview toolbars and @prismicio packages further separate a live Prismic stack from a site that merely mentions the vendor.
How to tell from a public page
- [Prismic] Prismic HTML/source match on `images.prismic.io` (evidence shows hit count).
- [Prismic] Prismic HTML/source match on `.cdn.prismic.io` (evidence shows hit count).
- [Prismic] Prismic HTML/source match on `.prismic.io/` (evidence shows hit count).
- [Prismic] Prismic HTML/source match on `@prismicio/` (evidence shows hit count).
- [Prismic] Prismic HTML/source match on `prismic-reactjs` (evidence shows hit count).
How to read the result
Call Prismic confirmed only when public HTML or headers expose reproducible structural fingerprints unique to that stack. Custom asset proxies can hide prismic.io while content still comes from Prismic. Common false positives: Agency portfolios naming Prismic on case studies for other stacks. After a hit: Constrain slice image sizes, fill alt, cache API responses, and audit client-heavy slices.
What to do next
Constrain slice image sizes, fill alt, cache API responses, and audit client-heavy slices. If the front end looks React-based, continue into Next.js detector. When you need weighted scores for LCP, images, SEO and accessibility together, open run the full performance / images / SEO / accessibility audit on the home page.
Related detectors
FAQ
How is Prismic detected?
From structural signatures in the public HTML and response headers (domains, paths, attributes, scripts). Every verdict lists how many times each pattern matched — nothing is guessed.
Can the result be wrong?
If only a bare brand keyword matches without structural evidence, we label it \u201clikely\u201d instead of \u201cconfirmed\u201d — we would rather under-report than cry wolf.
Do you save the URLs I check?
No. The audit runs inside the request and the URL you paste is not written to storage. There are no third-party tracking scripts on the page either, so no log of who checked what exists. Copy the result yourself if you want a record.
Can a website hide what it is built with?
Partly, but rarely completely. The HTML sent to your browser, the response headers, script paths and asset structure have to be exposed to work, so there is always something readable. Server-side code, build config and private APIs stay invisible. That is why this tool reports the evidence it found rather than claiming a full picture. No match does not mean the technology is absent.
Optimization help is available
Tell me your URL and what you want fixed — you get a clear scope, price and timeline.
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