Detect Let's Encrypt
Let's Encrypt is a free, automated, and open certificate authority.
01
Websites using Let's Encrypt
663 hostnames in the PluginView corpus for this technology.
| Hostname | Last seen |
|---|---|
| wikipedia.org | 8/3/2026 |
| twitter.com | 8/3/2026 |
| wordpress.org | 8/3/2026 |
| slack.com | 8/3/2026 |
| tumblr.com | 8/3/2026 |
Whole list · $46.41 (663 × $0.07)
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Let's Encrypt signature at the time of the scan.
- Does not establish
- A sitewide install of Let's Encrypt, an active vendor contract, exclusive use, or that Let's Encrypt is still in place today.
03
How to check a site for Let's Encrypt
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Let's Encrypt signals.
- 2. PluginView reads only public responses and scores them against proprietary Let's Encrypt fingerprints. Rule bodies and identifiers are not published.
- 3. Review the confidence score and text explanation for Let's Encrypt on the results page.
04
FAQ: detecting Let's Encrypt
- Can PluginView detect Let's Encrypt without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Let's Encrypt. It does not bypass authentication or paywalls.
- What category is Let's Encrypt?
- Let's Encrypt is classified under SSL/TLS certificate authorities in the PluginView directory.
- Does PluginView publish Let's Encrypt 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.
