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.
secure-mobile-apps.booking.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
secure-mobile-apps.booking.com is a subdomain of booking.com, the app's own publisher domain, so this is first-party backend/API traffic rather than a third-party tracker. The app's label already declares collecting account, payment, and device identifier data, so this contact implies no data flow beyond what is disclosed.
OpenAI — first-party
The domain is a booking.com subdomain and most likely supports Booking.com's own mobile application services. The privacy label declares broad collection and sharing categories, so this contact alone does not imply an undeclared data flow.
Google Gemini — first-party
The domain secure-mobile-apps.booking.com is a subdomain of booking.com, making it a first-party operational endpoint for the Booking.com app. Because it belongs to the app developer's primary domain, this contact does not represent an undisclosed third-party data flow.
Apps measured contacting this domain
| App | Label gap | Donations | Contacts | Seen |
|---|---|---|---|---|
| Booking.com: Hotels & Travel | — | 4 | 12 | 2026-07-28 → 2026-07-29 |
The corpus grows one report at a time: donate your App Privacy Report — anonymous by design.
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