Substack
Security and trust center evidence
A place for independent writing.
Summary
Substack has 1 registry-verified row in the CertReports index, last verified 26 Oct 2026. The strongest row is EU-US Data Privacy Framework: Active: EU-US Certification, SW-US Certification, UK Extension Certification. This page is independent of the vendor’s own trust centre: dates, sources and caveats come from CertReports captures.
Reviewer brief
As of 26 Oct 2026, CertReports holds 1 registry-verified row for Substack, drawn from the Data Privacy Framework list. Substack is listed in the Data Privacy Framework list for EU-US Data Privacy Framework (Active: EU-US Certification, SW-US Certification, UK Extension Certification), dated 1 Nov 2024. No public evidence was found for SOC 2, ISO/IEC 27001, HIPAA and GDPR as of 26 Oct 2026; that is a gap in the public record, not a finding of non-coverage, and the vendor can supply it under NDA.
- EU-US Data Privacy Framework: Active: EU-US Certification, SW-US Certification, UK Extension Certification, verified as of 26 Oct 2026
Facts only, each dated; nothing here is inferred, scored or advised.
Among e-commerce vendors
1verified rows
Category median 1, across 128 indexed e-commerce vendors. Substack has more verified rows than 34 percent of them.
Compliance grid
Legal artefacts
No DPA, BAA or subprocessor list has been captured from a public page yet. Registry rows above do not depend on this.
Subprocessors
No subprocessor list captured yet.
Change history
- 18 Sep 2026First indexed by CertReports1 evidence row across 1 framework entered the index.
Evidence against regulations
All regulations for SubstackHow much of each regulation’s vendor requirements Substack’s public evidence reaches.
Reviewing a vendor on public evidence
All articlesWhat Is a Trust Centre? Vendor Evidence vs Office Settings
Solomon Amos · 28 Oct 2026 · 10 min read