Detect Preact
Preact is a JavaScript library that describes itself as a fast 3kB alternative to React with the same ES6 API.
Detection looks at dom selectors across 1 fingerprint rules among the site's public responses.
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Websites using Preact
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Signal classes
PluginView evaluates public page signals in these classes when identifying Preact. Individual fingerprint rule bodies are proprietary and are not published.
- DOM selectors
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Example public indicators for Preact
Illustrative indicators derived from public catalog metadata for Preact. A live scan may match additional proprietary rules beyond these examples.
- #app, .app, #root, .root, body, body > *, body > * > *, body > * > * > *
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Preact signature (1 rules) at the time of the scan.
- Does not establish
- A sitewide install of Preact, an active vendor contract, exclusive use, or that Preact is still in place today.
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How to check a site for Preact
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Preact signals.
- 2. PluginView reads only public responses (dom selectors) and scores them against the Preact signature set (1 rules).
- 3. Review the confidence score and text explanation for Preact on the results page.
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FAQ: detecting Preact
- Can PluginView detect Preact without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Preact — typically dom selectors. It does not bypass authentication or paywalls.
- What category is Preact?
- Preact is classified under JavaScript libraries in the PluginView directory.
- How many fingerprint rules cover Preact?
- This reference currently tracks 1 fingerprint rule across dom selectors. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses Preact?
- Illustrative public indicators for Preact include #app, .app, #root, .root, body, body > *, body > * > *, body > * > * > *. A live scan may match additional proprietary rules beyond these examples.
