Can I trust Wesper?
This app did not meet two or more trust checks, has a critical issue in one, or has a red flag.
- What it means for you
- Biometric health data, including sleep metrics and audio recordings, is addressed in code only to Wesper's own servers, and no advertising networks or data brokers are named as destinations. The app is configured to prevent health files from being extracted via device backup. The build includes code to send usage and app performance data to Firebase Analytics and Google services for diagnostics and improvement.
- Main concern
- Auth token stored plaintext in SharedPreferences — full account and health data exposure
- The developer's description
- The Wesper app pairs with Wesper's wireless at-home sleep analysis tool to analyze snoring, respiration rate, breathing, heart rate, and sleeping positions. Receive real-time sleep metrics and actionable insights from sleep specialists to improve your sleep quality.
- Third-party services
- 14
- Findings rated low or higher
- 10
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Full findings
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Trust checks
Secure by Design
Items recorded, result pending reviewSecurity gaps detected
Why this result
This check looks for security issues at high severity or above in the code of this build, and at least one was recorded. Issues of this kind include a credential or token another app on the device can reach, sensitive data stored without protection, and network paths that expose information in transit.
Data Minimization
Items recorded, result pending reviewTracking lacks clear disclosure
Why this result
This build contains analytics or attribution code written to send data to companies other than the developer. No consent step was found before that code runs, and the app's disclosures do not describe the collection in full. Tracking by itself is ordinary; what this check reports is the combination of collection, recipient and absent disclosure.
Manifest Mismatch
An item rated high or above is openDisclosure incomplete or contradicted
Why this result
The check compares the app's privacy disclosures against what the code does, and at least one claim did not match in this build. Mismatches of this kind include a data category collected but not disclosed, a recipient the disclosure omits, and an identifier attached to data the disclosure describes as anonymous.
User Control
StrongNo lock-in
Why this result
The check looks for a way to export the data an account has accumulated and a way to delete the account itself. In this build, either both were found, or the app has no account of its own and keeps its data on the device. For an app without an account, the developer has no server-side copy to export or delete, and deleting the app removes the data in its own storage.
The app's backend supports account deletion, and sleep diagnostic reports are accessed through a standard web browser rather than a proprietary locked viewer. No artificial barriers to closing the account or switching away from the service were identified.
Truly Local
One criterion not metContains code to send personal data off the device
Why this result
This app presents itself as working offline or on the device alone, and this build contains code written to send personal data to servers. The check covers analytics, crash reporting, advertising code and any first-party endpoint the code addresses personal data to. Code of this kind is common; what this check reports is the distance between that code and how the app describes itself.
Red flags
The app's privacy declarations do not match its code
Why this result
The privacy declarations shipped in this build, or the ones on the store listing, state less than the code does. Declarations of this kind are what a store, a regulator and a person comparing two apps rely on.
Strengths
- No advertising, attribution, or session recording SDKs are present — the third-party tracking surface is limited to crash diagnostics only
- The app includes code to upload biometric health data (SpO₂, heart rate, respiration, snoring audio) only to Wesper's own first-party servers, and includes no code to pass it to ad networks or data brokers
- App backup is fully disabled via both allowBackup=false and data_extraction_rules.xml — biometric files and credentials cannot be extracted via ADB or cloud backup
- Sensitive credentials (password, order code, group code, birthdate) are encrypted with AES-256-GCM using Android EncryptedSharedPreferences — the infrastructure is already in place for full coverage
What the app contains
14 services
Third-party services the scan names in the build:
- Firebase Crashlytics
- Firebase Remote Config
- Firebase Installations
- Firebase Sessions
- Firebase Analytics
- Firebase ABT
- Google Play Services
- Google Tink
- OkHttp
- Retrofit2
- Koin
- Lottie
- Acuity Scheduling (wesper.as.me)
- Azova (azova.com)
Libraries
| Library | Version | Advisory |
|---|---|---|
| Room | not recorded | none confirmed |
| Lottie | not recorded | none confirmed |
| Datatransport | not recorded | none confirmed |
| Google Play Services | 12451000 | none confirmed |
| Google Tink | not recorded | none confirmed |
| Firebase | 12451000 | none confirmed |
| OkHttp | 5.1.0 | none confirmed |
| Okio | not recorded | none confirmed |
| Retrofit | not recorded | none confirmed |
| Koin | not recorded | none confirmed |
Show all 12 librariesShow fewer
Changes since the previous scan
- Version 4.1.0 (versionCode 215), score 75.
- Score 88 before, 75 after.
- Version 2.34.0 (Build 198) before, 4.1.0 (versionCode 215) after.
- Score change since version 2.34.0 (Build 198): -13 points.
- Since the previous scan: 12 findings added, 3 removed.
- Version 2.34.0 (Build 198), score 88.
- First public scan of this app.
Method and limits
Static analysis: the decompiled code, manifest and resources of this build, read file by file. Network traffic at run time is established by a capture of the running app.
- Build SHA-256
- 17690f5d34b53515f1d846cc610d9cad075873f99856c037ba3dd71a5b451c56
- Rule pack
- citt-ruleset-2026-08-v1
- Files decompiled
- 10,654
- Scan date
- 12 August 2026
Corrections
No correction is published for this app.
Developer response
No response is published for this app.
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