Detect Substack
Substack is an American online platform that provides publishing, payment, analytics, and design infrastructure to support subscription newsletters.
Detection looks at response headers across 2 fingerprint rules among the site's public responses.
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Websites using Substack
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Signal classes
PluginView evaluates public page signals in these classes when identifying Substack. Individual fingerprint rule bodies are proprietary and are not published.
- Response headers
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Example public indicators for Substack
Illustrative indicators derived from public catalog metadata for Substack. A live scan may match additional proprietary rules beyond these examples.
- x-cluster: substack
- x-served-by: Substack
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What a detection means
- Establishes
- One or more public signals on the scanned page matched a known Substack signature (2 rules) at the time of the scan.
- Does not establish
- A sitewide install of Substack, an active vendor contract, exclusive use, or that Substack is still in place today.
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How to check a site for Substack
- 1. Enter the website URL in the scan form — homepage, pricing, checkout, or login pages usually expose the strongest Substack signals.
- 2. PluginView reads only public responses (response headers) and scores them against the Substack signature set (2 rules).
- 3. Review the confidence score and text explanation for Substack on the results page.
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FAQ: detecting Substack
- Can PluginView detect Substack without logging in?
- Yes. PluginView only reads publicly accessible responses when checking for Substack — typically response headers. It does not bypass authentication or paywalls.
- What category is Substack?
- Substack is classified under Blogs in the PluginView directory.
- How many fingerprint rules cover Substack?
- This reference currently tracks 2 fingerprint rules across response headers. Individual rule bodies are proprietary and are not published.
- What public signals suggest a site uses Substack?
- Illustrative public indicators for Substack include x-cluster: substack; x-served-by: Substack. A live scan may match additional proprietary rules beyond these examples.
