DaysyDay (ch.valleyelectronics.daysyday): Privacy & Security Findings

report - rfi-irfos
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Permanent Disclosure Ledger

The discipline, demonstrated

On behalf of our research partners, we investigate publicly distributed Android and iOS apps: we decompile them, follow their code and data flows, and trace every connection to the servers it reaches. Hundreds of agents work through each app and join the technical evidence into one picture, which our specialists then review and verify.

387+
Android/iOS apps audited
Every app is decompiled at source-code level, not just scanned from outside.
1.04M+
Smali classes read
The full shipped code we have actually read, not an estimate.
262+
Critical findings recorded
Confirmed findings copied to regulators, not theoretical risks.
970+
Weak points found
Third-party tracking we have provably found inside the binary.
567+
Endpoints investigated
Real servers and countries where data actually flows.
132+
SDK instances mapped
Reusable libraries correlated across the entire corpus.
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Showing the report for DaysyDay.
OrganisationNotifiedStatusSevIntel (click to expand)StatutesResolvedDisclosureElapsedReport
DaysyDay
Private
2026-06-20
91d ago
Waiting
Critical
DaysyDay's own privacy policy explicitly promises that your fertility and sexual-activity data stays within Switzerland and Germany, but the app actually sends that data to a server based in the United States, directly contradicting its own promise. It also hardcodes a logging-service address directly inside the production app.
ch.valleyelectronics.daysyday. usa.daysy.measur - a US-based endpoint - receives fertility and sexual-activity data (Art. 9) despite the app's own privacy policy stating explicitly that data stays within Switzerland and Germany. Hardcoded Sentry DSN found in the production build. Operator: Valley Electronics AG (Zürich).
click to expand
GDPR Art. 9(1)GDPR Art. 44-49GDPR Art. 5(1)(c)+2
Yes
Closed
Disclosure
91d 00h 00m 00s
Published
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This ledger is updated in real time as companies respond. Silence is public. Severity is scored primarily by CVSS v4.0, we reserve the right to deviate based on blast radius.