Detect Preact
Preact is a JavaScript library that describes itself as a fast 3kB alternative to React with the same ES6 API.
01
Websites using Preact
1 hostnames in the PluginView corpus for this technology.
| Hostname | Last seen |
|---|---|
| pagar.me | 8/4/2026 |
02
What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Preact signature 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.
03
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 and scores them against proprietary Preact fingerprints. Rule bodies and identifiers are not published.
- 3. Review the confidence score and text explanation for Preact on the results page.
04
FAQ: detecting Preact
- Can PluginView detect Preact without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Preact. It does not bypass authentication or paywalls.
- What category is Preact?
- Preact is classified under JavaScript libraries in the PluginView directory.
- Does PluginView publish Preact fingerprint rules?
- No. Detection uses proprietary fingerprint rules that are not published. Scan results explain matches in plain language without disclosing rule bodies or identifiers.
