Generated by a model from the captured document; not read by a person
LowNeutral for users
Affected users
All usersContent creators
Substack replaced AdQuick, a third-party analytics tracking pixel, with muxData for video metric collection. The change shifts from pixel-based tracking to persistent cookie-based collection of anonymous video metrics. Both vendors operate on the .substack.com domain with a 2-year cookie lifetime.
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Generated by a model from the captured document; not read by a person
The updated policy discloses a change in which third-party vendor collects video performance metrics on Substack. The policy previously listed AdQuick as the analytics vendor; it now lists muxData. Both collect data via persistent cookies on the .substack.com domain with a 2-year lifetime. The change does not alter the types of data collected (anonymous video metrics) or the retention period, but reflects a shift in the vendor providing the analytics service.
Key Clauses Affected
Generated by a model from the captured document; not read by a person
Third-party analytics vendor disclosure
Vendor changed from AdQuick (pixel-based) to muxData (persistent cookie-based) for anonymous video metric collection.
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This change record describes what was added, removed, or modified in the document. Analysis reflects what the updated agreement states or permits. It does not constitute a legal determination about enforceability. Applicability may vary by jurisdiction. Methodology
Wording edits to this record that do not change what it claims. Changes to a claim are published as corrections.
2026-10-11 · Feed summary edited · summary regenerated by summarize_events
Previous text Replaced third-party analytics vendor AdQuick with muxData for anonymous video metric collection.
2026-10-11 · Impact summary edited · summary regenerated by summarize_events
Previous text The updated privacy policy replaces one analytics tracking vendor with another. Previously, Substack disclosed use of AdQuick, a pixel-based third-party analytics tracker. The revised policy now lists muxData as the vendor for video metric collection. Both vendors operate on the same persistent cookie basis and serve analytics functions, so the functional scope of data collection and use remains substantially similar in kind, though the specific vendor processing the data has changed.
2026-10-11 · Summary edited · summary regenerated by summarize_events
Previous text Substack replaced one third-party tracking vendor with another in their privacy policy. The policy previously listed AdQuick as a persistent tracking pixel for third-party analytics; this vendor reference has been removed and replaced with muxData, which collects anonymous video metrics. The practical effect is a change in which vendor processes tracking data on Substack's platform, though both serve analytics purposes.
2026-10-07 · Change line edited · change line rewritten to the 2026-10-07 template: no detection date, no sentence counts
Previous text Substack updated their Substack Privacy Policy on June 05, 2026. Change detected: 1 sentence(s) removed, 1 sentence(s) modified. Document contained 178 sentences after update.
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Institutional Analysis
Generated by a model from the captured document; not read by a person
Assessment
Substack replaced one third-party analytics vendor (AdQuick) with another (muxData) for video metric collection. This is a vendor substitution rather than a new data practice. The change does not introduce new data categories, expand collection …
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Regulatory exposure, obligation change, escalation trigger, board-ready language, and recommended action for legal and compliance teams.
ConductAtlas provides verified policy intelligence sourced directly from platform documents. All analysis is intended to support, not replace, legal and compliance review. Record CA-X-002684.
Substack's updated privacy policy adds disclosure that it shares account identifiers with child safety industry consortia to detect child sexual …
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