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Knowunity: AI Study & Homework

Knowunity · Build 6.42.0

de.knowunity.app
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Static analysis completeScanned 2026-10-13 00:53 UTC

Static checks identify review items, not a guarantee of safety.

Overview

Analysis recorded

5 finding categories to review

Knowunity: AI Study & Homework (de.knowunity.app) scored grade A, 90 out of 100, in a static scan of version 6.42.0 on 2026-10-13. It has no high or critical findings, and 5 lower-severity finding categories across 6 occurrences. 21 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.

Finding categories56 occurrences
High / critical0Category count
Tracking SDKs21Presence, not observed traffic
Assessment score90 / 100Grade A

Start with these findings

mediumCleartext (HTTP) traffic permitted1 occurrence

Interpretation & review guidance

The manifest permits cleartext (HTTP) traffic. Data sent over plain HTTP can be read or tampered with on the network; modern apps should require HTTPS.

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.
Open in all findingsRequest a correction
lowData Safety label omits Contacts2 occurrences

Interpretation & review guidance

The app's Google Play Data Safety label omits a data category it can actually access — a permission it requests, or an advertising/device identifier it references. Under-declaring collection is a Play policy issue and a COPPA/privacy concern. This is a static signal: a requested permission is capability, not proof of collection — confirm against runtime behavior.

How often Data Safety labels disagree with the package →

Evidence
2 recorded occurrences in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.
Open in all findingsRequest a correction
lowExported content provider without permission (third-party library artifact, shared across 401 unrelated developers)1 occurrence

Interpretation & review guidance

An exported content provider declares no permission. Other apps on the device may reach it — verify it enforces access control internally; this flags the attack surface, not a confirmed leak.

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.
Open in all findingsRequest a correction
View all 5 categories

Privacy

33 requested permissions · 6 flagged high-risk classes.

Review privacy signals →

Build & components

89 components recorded. Certificate parsing does not validate APK signature integrity.

Inspect build evidence →
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Findings

5 categories · 6 occurrences. Severity totals describe categories. Expand a finding for interpretation and review guidance.

mediumCleartext (HTTP) traffic permitted1 occurrence

Interpretation & review guidance

The manifest permits cleartext (HTTP) traffic. Data sent over plain HTTP can be read or tampered with on the network; modern apps should require HTTPS.

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:usesCleartextTraffic="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.

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Link to categoryRequest a correction
lowData Safety label omits Contacts2 occurrences

Interpretation & review guidance

The app's Google Play Data Safety label omits a data category it can actually access — a permission it requests, or an advertising/device identifier it references. Under-declaring collection is a Play policy issue and a COPPA/privacy concern. This is a static signal: a requested permission is capability, not proof of collection — confirm against runtime behavior.

How often Data Safety labels disagree with the package →

Evidence
2 recorded occurrences 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
data-safety:Contacts
Recorded match
Pattern recorded; identifying value redacted.

2 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 tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction
lowExported content provider without permission (third-party library artifact, shared across 401 unrelated developers)1 occurrence

Interpretation & review guidance

An exported content provider declares no permission. Other apps on the device may reach it — verify it enforces access control internally; this flags the attack surface, not a confirmed leak.

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:com.facebook.FacebookContentProvider
Recorded match
FacebookContentProvider (exported, no permission)
Detector rule
manifest
Recorded file locations
  • AndroidManifest.xml:com.facebook.FacebookContentProvider

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 tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction
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 tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction
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 tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction

Privacy signals

Capabilities and bundled software do not prove that data was collected or transmitted.

Requested permissions33
Flagged high-risk classes6
Detected SDKs21

Precise location Approx. location Camera Microphone Contacts Phone state

Requested permission inventory (33)
  • android.permission.ACCESS_ADSERVICES_AD_ID
  • android.permission.ACCESS_ADSERVICES_ATTRIBUTION
  • android.permission.ACCESS_ADSERVICES_CUSTOM_AUDIENCE
  • android.permission.ACCESS_ADSERVICES_TOPICS
  • android.permission.ACCESS_COARSE_LOCATION
  • android.permission.ACCESS_FINE_LOCATION
  • android.permission.ACCESS_NETWORK_STATE
  • android.permission.ACCESS_WIFI_STATE
  • android.permission.BLUETOOTH_CONNECT
  • android.permission.CAMERA
  • android.permission.CHANGE_NETWORK_STATE
  • android.permission.DETECT_SCREEN_CAPTURE
  • android.permission.FOREGROUND_SERVICE
  • android.permission.FOREGROUND_SERVICE_MICROPHONE
  • android.permission.INTERNET
  • android.permission.MODIFY_AUDIO_SETTINGS
  • android.permission.POST_NOTIFICATIONS
  • android.permission.READ_CONTACTS
  • android.permission.READ_PHONE_STATE
  • android.permission.RECEIVE_BOOT_COMPLETED
  • android.permission.RECORD_AUDIO
  • android.permission.USE_BIOMETRIC
  • android.permission.USE_FINGERPRINT
  • android.permission.VIBRATE
  • android.permission.WAKE_LOCK
  • android.permission.WRITE_CONTACTS
  • com.android.vending.BILLING
  • com.android.vending.CHECK_LICENSE
  • com.google.android.c2dm.permission.RECEIVE
  • com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
  • com.google.android.gms.permission.AD_ID
  • com.google.android.providers.gsf.permission.READ_GSERVICES
  • de.knowunity.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Data collection & flow (privacy signal, not part of the grade)

Data the app can access
Camera
Camera
Contacts
ContactsContacts (write)
Location
Precise locationApproximate location
Microphone
Microphone
Phone
Phone state / number
Photos & files
Storage (write)Storage
Persistent identifiers (referenced in code)
Advertising ID (AAID)Android IDDevice ID / IMEI
Where it can go
Third parties present (18)
AppLovinChartboostGoogle AdMobInMobiMeta Audience NetworkMintegralPangle (ByteDance)TapjoyUnity AdsVungleYandex AdsironSourceBraze (Appboy)Google Analytics for FirebaseGoogle Firebase AnalyticsGoogle Tag ManagerMeta / Facebook SDKAdjust
  • Precise location, Approximate location requested while 13 ad/attribution SDK(s) are present (AppLovin, Chartboost, Google AdMob +10 more) — location commonly feeds ad targeting.
  • Persistent-identifier APIs referenced in code (Advertising ID (AAID), Android ID, Device ID / IMEI) with 18 analytics/ad SDK(s) present — the mechanism used for cross-app profiling.
  • Camera, Contacts, Microphone, Phone, 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: declared vs observed (Play label vs our analysis)

Declared collected
App activityApp info and performanceFiles and docsMessagesPersonal infoPhotos and videos
Declared shared
App info and performanceDevice or other IDs
We observe the app can access
ContactsLocation
⚠ Possible Data Safety mismatch. Label omits 2 categories the app can access: Contacts, Location.

We compare the developer's Google Play Data Safety declaration with what the binary can actually do (permissions it requests, identifier APIs and third-party SDKs it ships). A mismatch is a capability signal to confirm — a requested permission is not proof of collection.

Trackers & SDKs (21 detected · privacy signal, not part of the grade)

Advertising
AppLovinChartboostGoogle AdMobInMobiMeta Audience NetworkMintegralPangle (ByteDance)TapjoyUnity AdsVungleYandex AdsironSource
Analytics
Braze (Appboy)Google Analytics for FirebaseGoogle Firebase AnalyticsGoogle Tag ManagerMeta / Facebook SDK
Attribution
Adjust
Consent
Google UMP (consent)IAB TCF
Crash reporting
Sentry

Build & components

Scanned build 6.42.0. Store metadata may describe a newer release.

APK SHA-256e6fd874e426981a9eaae0e9c5cbf888825d53edeec12dba60caf59976e841c58

Signing certificate (who signed this build — factual, not part of the grade)

Signer
Google Inc. self-signed
Scheme
V3V2
Key
RSA 4096-bit
Algorithm
sha256WithRSA
Validity
2019-09-23 → 2049-09-23
Cert SHA-256
72:4f:4e:75:97:5b:a5:5f:b0:df:39:77:db:71:3d:ea:32:14:a7:98:f5:36:86:35:e5:8f:2d:dc:d8:b9:4b:c7

The certificate fingerprint identifies the parsed signing certificate. Knowing this public fingerprint does not establish ownership or validate the APK signature.

Signature integrity: not established by certificate parsing.

Component inventory

89 components. Advisory matching covers a curated set; no match is not proof that a component is vulnerability-free.

Bundled components and recorded advisory matches
ComponentVersionAdvisory matches
androidx.activity:activity1.13.0None recorded
androidx.activity:activity-ktx1.13.0None recorded
androidx.annotation:annotation-experimental1.4.1None recorded
androidx.appcompat:appcompat1.7.1None recorded
androidx.appcompat:appcompat-resources1.7.1None recorded
androidx.asynclayoutinflater:asynclayoutinflater1.0.0None recorded
androidx.biometric:biometric1.1.0None recorded
androidx.browser:browser1.9.0None recorded
androidx.camera.featurecombinationquery:featurecombinationquery1.6.2None recorded
androidx.camera:camera-camera21.6.2None recorded
androidx.camera:camera-camera2-pipe1.6.2None recorded
androidx.camera:camera-core1.6.2None recorded
androidx.camera:camera-lifecycle1.6.2None recorded
androidx.camera:camera-video1.6.2None recorded
androidx.cardview:cardview1.0.0None recorded
androidx.compose.runtime:runtime-annotation1.9.0None recorded
androidx.constraintlayout:constraintlayout2.2.2None recorded
androidx.coordinatorlayout:coordinatorlayout1.0.0None recorded
androidx.core:core1.18.0None recorded
androidx.core:core-backported-fixes1.0.0None recorded
androidx.core:core-ktx1.18.0None recorded
androidx.core:core-viewtree1.0.0None recorded
androidx.credentials:credentials1.6.0None recorded
androidx.credentials:credentials-play-services-auth1.6.0None recorded
androidx.cursoradapter:cursoradapter1.0.0None recorded
androidx.customview:customview1.1.0None recorded
androidx.customview:customview-poolingcontainer1.0.0None recorded
androidx.datastore:datastore1.1.7None recorded
androidx.datastore:datastore-core1.1.7None recorded
androidx.datastore:datastore-preferences1.1.7None recorded
androidx.datastore:datastore-preferences-core1.1.7None recorded
androidx.documentfile:documentfile1.0.0None recorded
androidx.drawerlayout:drawerlayout1.0.0None recorded
androidx.emoji2:emoji21.3.0None recorded
androidx.emoji2:emoji2-views-helper1.3.0None recorded
androidx.exifinterface:exifinterface1.4.2None recorded
androidx.fragment:fragment1.8.9None recorded
androidx.fragment:fragment-ktx1.8.9None recorded
androidx.heifwriter:heifwriter1.0.0None recorded
androidx.interpolator:interpolator1.0.0None recorded
androidx.legacy:legacy-support-core-ui1.0.0None recorded
androidx.legacy:legacy-support-core-utils1.0.0None recorded
androidx.legacy:legacy-support-v41.0.0None recorded
androidx.lifecycle:lifecycle-livedata2.11.0None recorded
androidx.lifecycle:lifecycle-livedata-core2.11.0None recorded
androidx.lifecycle:lifecycle-livedata-core-ktx2.11.0None recorded
androidx.lifecycle:lifecycle-process2.11.0None recorded
androidx.lifecycle:lifecycle-runtime2.11.0None recorded
androidx.lifecycle:lifecycle-runtime-ktx2.11.0None recorded
androidx.lifecycle:lifecycle-service2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel-ktx2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel-savedstate2.11.0None recorded
androidx.loader:loader1.1.0None recorded
androidx.localbroadcastmanager:localbroadcastmanager1.1.0None recorded
androidx.media:media1.7.0None recorded
androidx.navigationevent:navigationevent1.0.0None recorded
androidx.preference:preference1.2.1None recorded
androidx.print:print1.0.0None recorded
androidx.privacysandbox.ads:ads-adservices1.1.0-beta11None recorded
androidx.privacysandbox.ads:ads-adservices-java1.1.0-beta11None recorded
androidx.profileinstaller:profileinstaller1.4.0None recorded
androidx.recyclerview:recyclerview1.4.0None recorded
androidx.room:room-runtime2.2.5None recorded
androidx.savedstate:savedstate1.4.0None recorded
androidx.savedstate:savedstate-ktx1.4.0None recorded
androidx.security:security-crypto1.1.0None recorded
androidx.slidingpanelayout:slidingpanelayout1.2.0None recorded
androidx.sqlite:sqlite2.1.0None recorded
androidx.sqlite:sqlite-framework2.1.0None recorded
androidx.startup:startup-runtime1.1.1None recorded
androidx.swiperefreshlayout:swiperefreshlayout1.2.0None recorded
androidx.tracing:tracing1.3.0None recorded
androidx.tracing:tracing-ktx1.3.0None recorded
androidx.transition:transition1.4.1None recorded
androidx.vectordrawable:vectordrawable1.1.0None recorded
androidx.vectordrawable:vectordrawable-animated1.1.0None recorded
androidx.versionedparcelable:versionedparcelable1.1.1None recorded
androidx.viewpager:viewpager1.0.0None recorded
androidx.webkit:webkit1.15.0None recorded
androidx.window.extensions.core:core1.0.0None recorded
androidx.window:window1.2.0None recorded
androidx.window:window-java1.2.0None recorded
androidx.work:work-runtime2.7.0None recorded
com.google.dagger:dagger2.59None recorded
com.squareup.okhttp3:okhttp4.12.0None recorded
kotlinx:coroutines_android1.11.0None recorded
kotlinx:coroutines_core1.11.0None recorded
kotlinx:coroutines_play_services1.11.0None recorded
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About this app · store information

About this app

Exam Prep | Homework | Practice

Content ratingEveryone 10+
Download size107.6 MB
Privacy policyPublished →
Developer siteknowunity.de

Screenshots

App screenshotApp screenshotApp screenshotApp screenshotApp screenshotApp screenshotApp screenshotApp screenshot

Scan history

Each row is an observed scan. Gaps between scans do not establish how long a finding existed.

Scanned (UTC)BuildScoreGrade
2026-10-13 00:53 UTC6.42.090A
2026-10-06 00:45 UTC6.41.090A
2026-09-29 00:41 UTC6.40.090A
2026-09-19 03:12 UTC6.38.490A
2026-09-08 16:17 UTC6.37.090A

View changes between the last two scans →

Export & share

Exports describe the recorded assessment. Signed evidence proves origin and integrity, not completeness or safety.

SARIFFindings CSVCoverage JSONSigned evidenceSBOM

Coverage & gap matrix · Verify signed evidence

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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.

apk-scanner.com exposure grade
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HTML
<a href="https://apk-scanner.com/app/de.knowunity.app"><img src="https://apk-scanner.com/app/de.knowunity.app/badge.svg" alt="apk-scanner.com exposure grade" height="20"></a>

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