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.
gtm.trivago.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
gtm.trivago.com is a subdomain of the app publisher's own domain (trivago), so by ownership it is a first-party endpoint; the 'gtm' prefix conventionally suggests a tag-management/analytics loader (commonly Google Tag Manager), but I cannot verify from the given data what service actually terminates there or whether it proxies to third parties. The app already declares collecting and sharing device/user IDs, app interactions, and diagnostics, which covers the kind of flow this endpoint would plausibly carry, so nothing here appears outside the declared label.
OpenAI — first-party
The domain is a trivago subdomain and most likely supports trivago's own tag-management or measurement infrastructure. The app's label declares device IDs, app interactions, search history, location, and other actions, so this contact does not by itself imply an undeclared data flow.
Google Gemini — first-party
The domain gtm.trivago.com is a first-party subdomain owned and operated by Trivago. Because it is a first-party endpoint and the app declares broad data collection and sharing, this contact does not appear undisclosed.
Apps measured contacting this domain
| App | Label gap | Donations | Contacts | Seen |
|---|---|---|---|---|
| trivago: Compare hotel prices | — | 4 | 28 | 2026-07-28 → 2026-07-29 |
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