Rhythm Trainer
Demax · Build 0.2609180811
Static checks identify review items, not a guarantee of safety.
Overview
6 finding categories to review
Rhythm Trainer (ru.demax.rhythmerr) scored grade B, 85 out of 100, in a static scan of version 0.2609180811 on 2026-10-09. It has no high or critical findings, and 6 lower-severity finding categories across 6 occurrences. 9 tracking SDKs are present in the package, which describes what ships, not what runs or what it sends. This is static analysis of a single build: it does not observe the app running and does not establish that any data is exposed.
Start with these findings
mediumcom.squareup.okhttp3:okhttp 3.12.12 — CVE-2021-03411 occurrence
Interpretation & review guidance
The app bundles a third-party library whose declared version matches a public security advisory (CVE). This is flagged from the version the library itself ships and a curated advisory list — confirm exploitability in your context and update the dependency to the fixed version. It is not a proof of live exploitation.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
mediumShort signing key (RSA 1024-bit)1 occurrence
Interpretation & review guidance
The signing key is shorter than the modern 2048-bit RSA minimum. Short keys are cryptographically weaker; a release should re-key to at least RSA-2048 (or an EC key).
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
lowFirebase Realtime Database reference1 occurrence
Interpretation & review guidance
A Firebase Realtime Database URL. Nearly every app that uses Firebase ships one. It's only an exposure if the database rules are world-readable — that's what live verification checks.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Build & components
50 components recorded. Certificate parsing does not validate APK signature integrity.
Inspect build evidence →Findings
6 categories · 6 occurrences. Severity totals describe categories. Expand a finding for interpretation and review guidance.
mediumcom.squareup.okhttp3:okhttp 3.12.12 — CVE-2021-03411 occurrence
Interpretation & review guidance
The app bundles a third-party library whose declared version matches a public security advisory (CVE). This is flagged from the version the library itself ships and a curated advisory list — confirm exploitability in your context and update the dependency to the fixed version. It is not a proof of live exploitation.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Evidence preview
- Evidence type
- Component advisory match
- Representative location
sbom:com.squareup.okhttp3:okhttp:CVE-2021-0341- Recorded match
CVE-2021-0341 (fixed in 4.9.2)- Detector rule
sbom- Recorded file locations
sbom:com.squareup.okhttp3:okhttp:CVE-2021-0341
1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.
Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.
Preview evidence and Pro toolsSearch recorded evidence and save private review notes with Pro. $99/month plus applicable tax.
mediumShort signing key (RSA 1024-bit)1 occurrence
Interpretation & review guidance
The signing key is shorter than the modern 2048-bit RSA minimum. Short keys are cryptographically weaker; a release should re-key to at least RSA-2048 (or an EC key).
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Evidence preview
- Evidence type
- Signing metadata
- Representative location
META-INF/signing:key- Recorded match
RSA-1024- Detector rule
signing- Recorded file locations
META-INF/signing:key
1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.
Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.
Preview evidence and Pro toolsSearch recorded evidence and save private review notes with Pro. $99/month plus applicable tax.
lowFirebase Realtime Database reference1 occurrence
Interpretation & review guidance
A Firebase Realtime Database URL. Nearly every app that uses Firebase ships one. It's only an exposure if the database rules are world-readable — that's what live verification checks.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Evidence preview
- Evidence type
- Static string match
- Representative location
resources.arsc- Recorded match
Pattern recorded; identifying value redacted.- Detector rule
firebase_db- Recorded file locations
resources.arsc
1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.
Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.
Preview evidence and Pro toolsSearch recorded evidence and save private review notes with Pro. $99/month plus applicable tax.
lowFirebase Storage bucket reference1 occurrence
Interpretation & review guidance
A Firebase Cloud Storage bucket reference (the default <project>.appspot.com). Storing user files here is normal — it's only an exposure if the Storage security rules allow public read/list, which live verification tests.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Evidence preview
- Evidence type
- Static string match
- Representative location
resources.arsc- Recorded match
Pattern recorded; identifying value redacted.- Detector rule
firebase_storage_bucket- Recorded file locations
resources.arsc
1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.
Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.
Preview evidence and Pro toolsSearch recorded evidence and save private review notes with Pro. $99/month plus applicable tax.
lowGoogle API key (client-shipped; restriction unverified)1 occurrence
Interpretation & review guidance
Android apps are designed to ship Google API keys in the client; Google restricts them by app signing certificate + enabled API. This is only a problem if the key is left unrestricted — presence alone is expected, not an exposure.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Evidence preview
- Evidence type
- Static string match
- Representative location
resources.arsc- Recorded match
AIza•••••••• (21–40 chars, redacted)- Detector rule
google_api_key- Recorded file locations
resources.arsc
1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.
Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.
Preview evidence and Pro toolsSearch recorded evidence and save private review notes with Pro. $99/month plus applicable tax.
infoApplication data is backup-enabled1 occurrence
Interpretation & review guidance
The app allows Android backups (android:allowBackup="true"). App data can then be extracted via adb backup on many devices — a concern if the app stores tokens or personal/health/payment data locally. Common and low-severity, but worth disabling for sensitive apps.
- Evidence
- 1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
- Verification
- Static detection; current reachability is not established.
Evidence preview
- Evidence type
- Parsed app configuration
- Representative location
AndroidManifest.xml- Recorded match
android:allowBackup="true"- Detector rule
manifest- Recorded file locations
AndroidManifest.xml
1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.
Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.
Preview evidence and Pro toolsSearch recorded evidence and save private review notes with Pro. $99/month plus applicable tax.
No categories match these filters. Clear the search or choose all severities.
Privacy signals
Capabilities and bundled software do not prove that data was collected or transmitted.
Microphone
Requested permission inventory (14)
Data collection & flow (privacy signal, not part of the grade)
- Persistent-identifier APIs referenced in code (Advertising ID (AAID), Android ID, Device ID / IMEI +1 more) with 7 analytics/ad SDK(s) present — the mechanism used for cross-app profiling.
- Microphone, Photos & files data requested with third-party analytics/ad SDKs present.
This maps what the app can access (permissions it requests, identifier APIs its code references) to the third parties bundled in it. It reflects capability and SDK presence — not proof that a specific value was transmitted.
Data Safety comparison not recorded.
Trackers & SDKs (9 detected · privacy signal, not part of the grade)
Build & components
Scanned build 0.2609180811. Store metadata may describe a newer release.
ac78bfabc6a4435cf4e0a82297a296ef2ec516933cdd0e420655d7c38854c069Signing certificate (who signed this build — factual, not part of the grade)
f9:bb:56:d3:e0:66:92:7b:55:f3:b1:5d:58:f5:a2:db:7b:fb:a0:0c:8b:45:29:86:d6:85:a7:45:dc:45:7f:bdThe certificate fingerprint identifies the parsed signing certificate. Knowing this public fingerprint does not establish ownership or validate the APK signature.
Component inventory
50 components. Advisory matching covers a curated set; no match is not proof that a component is vulnerability-free.
| Component | Version | Advisory matches |
|---|---|---|
androidx.activity:activity | 1.8.1 | None recorded |
androidx.activity:activity-ktx | 1.8.1 | None recorded |
androidx.annotation:annotation-experimental | 1.4.0 | None recorded |
androidx.appcompat:appcompat | 1.7.0 | None recorded |
androidx.appcompat:appcompat-resources | 1.7.0 | None recorded |
androidx.core:core | 1.13.0 | None recorded |
androidx.core:core-ktx | 1.13.0 | None recorded |
androidx.cursoradapter:cursoradapter | 1.0.0 | None recorded |
androidx.customview:customview | 1.0.0 | None recorded |
androidx.databinding:viewbinding | 8.11.0 | None recorded |
androidx.datastore:datastore | 1.0.0 | None recorded |
androidx.datastore:datastore-preferences | 1.0.0 | None recorded |
androidx.documentfile:documentfile | 1.0.0 | None recorded |
androidx.drawerlayout:drawerlayout | 1.0.0 | None recorded |
androidx.emoji2:emoji2 | 1.3.0 | None recorded |
androidx.emoji2:emoji2-views-helper | 1.3.0 | None recorded |
androidx.fragment:fragment | 1.8.2 | None recorded |
androidx.fragment:fragment-ktx | 1.8.2 | None recorded |
androidx.interpolator:interpolator | 1.0.0 | None recorded |
androidx.legacy:legacy-support-core-utils | 1.0.0 | None recorded |
androidx.lifecycle:lifecycle-extensions | 2.2.0 | None recorded |
androidx.lifecycle:lifecycle-livedata | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-livedata-core | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-livedata-core-ktx | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-livedata-ktx | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-process | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-runtime | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-runtime-ktx | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-viewmodel | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-viewmodel-ktx | 2.8.4 | None recorded |
androidx.lifecycle:lifecycle-viewmodel-savedstate | 2.8.4 | None recorded |
androidx.loader:loader | 1.0.0 | None recorded |
androidx.localbroadcastmanager:localbroadcastmanager | 1.0.0 | None recorded |
androidx.print:print | 1.0.0 | None recorded |
androidx.privacysandbox.ads:ads-adservices | 1.0.0-beta05 | None recorded |
androidx.privacysandbox.ads:ads-adservices-java | 1.0.0-beta05 | None recorded |
androidx.profileinstaller:profileinstaller | 1.3.1 | None recorded |
androidx.savedstate:savedstate | 1.2.1 | None recorded |
androidx.savedstate:savedstate-ktx | 1.2.1 | None recorded |
androidx.startup:startup-runtime | 1.1.1 | None recorded |
androidx.swiperefreshlayout:swiperefreshlayout | 1.1.0 | None recorded |
androidx.tracing:tracing | 1.0.0 | None recorded |
androidx.vectordrawable:vectordrawable | 1.1.0 | None recorded |
androidx.vectordrawable:vectordrawable-animated | 1.1.0 | None recorded |
androidx.versionedparcelable:versionedparcelable | 1.1.1 | None recorded |
androidx.viewpager:viewpager | 1.0.0 | None recorded |
com.squareup.okhttp3:okhttp | 3.12.12 | 1 matchCVE-2021-0341 · medium |
kotlinx:coroutines_android | 1.7.3 | None recorded |
kotlinx:coroutines_core | 1.7.3 | None recorded |
kotlinx:coroutines_play_services | 1.7.3 | None recorded |
About this app · store information
About this app
Become a Rhythm Master, training for a 15 minutes per day
Screenshots
Scan history
Each row is an observed scan. Gaps between scans do not establish how long a finding existed.
| Scanned (UTC) | Build | Score | Grade |
|---|---|---|---|
| 2026-10-09 19:51 UTC | 0.2609180811 | 85 | B |
| 2026-10-02 17:45 UTC | 0.2609180811 | 85 | B |
| 2026-09-23 06:12 UTC | 0.2503021030 | 78 | B |
Export & share
Exports describe the recorded assessment. Signed evidence proves origin and integrity, not completeness or safety.
Coverage & gap matrix · Verify signed evidence
Embed the latest grade
Embed this grade
The badge reads the latest recorded grade each time it is loaded, and links back to the full report so a reader can see the build it covers and what the scan could not see.
Grades can move when a new version is scanned or when a detector is corrected. If you would rather publish a grade that cannot change under you, link a signed Proof Capsule instead.
API users can request authenticated, scan-specific exports at /v1/scans/650adbab-13ab-495e-b8f5-f1868ba2916b/findings.sarif (also coverage.json and proof.json).
Request a correction or removal · How to interpret a scan · Browse apps