This page aggregates measured, corroborated evidence: donors' iPhones recorded apps contacting this domain, every claim below was reported by separate accepted donations and published under a human verdict (later rows for an approved app inherit its verdict). A contact is a measurement, not an accusation — it does not show what data was sent.
h.costco.com
classified as first-party · 2
What our research panel found AI-drafted · human-reviewed
We ask several independent AI models the same question and publish their answers separately — cross-vendor agreement is evidence against fabrication, and disagreement is worth seeing. 3 of 3 models answered, overall confidence high. A human reviewed this domain's claims before anything here published.
Anthropic Claude — first-party
h.costco.com is a subdomain of the app publisher's own domain (costco.com), so it most plausibly resolves to first-party infrastructure; I do not know what specific service is hosted there, and a first-party subdomain can sometimes front a third-party analytics vendor via CNAME delegation, which this data does not let me confirm. The app already declares collecting app interactions, web browsing history, and diagnostics, which would cover ordinary first-party telemetry, so nothing here indicates an undeclared data flow.
OpenAI — first-party
The domain is a Costco subdomain, so it most likely represents first-party infrastructure. The provided privacy label already declares several relevant usage, interaction, diagnostic, and browsing-history data categories, so an undisclosed flow cannot be established from this contact alone.
Google Gemini — first-party
The contacted domain h.costco.com is a first-party subdomain of the app developer (Costco Wholesale). First-party network traffic for routine app operations does not indicate an undisclosed third-party data flow.
Apps measured contacting this domain
| App | Label gap | Donations | Contacts | Seen |
|---|---|---|---|---|
| Costco Wholesale | — | 4 | 4 | 2026-07-28 → 2026-07-29 |
The corpus grows one report at a time: donate your App Privacy Report — anonymous by design.
Think something here is wrong?
Evidence and research improve when people push back. Tell us what to re-check — a misattributed domain, an outdated classification, a claim about your own app — and a human will review it. Responses can take up to 30 days.