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HelloTalk - Learn Languages

HelloTalk Learn Languages App · Build 6.4.20

com.hellotalk
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Static analysis completeScanned 2026-10-12 23:36 UTC

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

Overview

Analysis recorded

7 finding categories to review

HelloTalk - Learn Languages (com.hellotalk) scored grade B, 83 out of 100, in a static scan of version 6.4.20 on 2026-10-12. It has no high or critical findings, and 7 lower-severity finding categories across 11 occurrences. 22 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 categories711 occurrences
High / critical0Category count
Tracking SDKs22Presence, not observed traffic
Assessment score83 / 100Grade B

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
mediumcom.squareup.okhttp3:okhttp 3.12.13 — 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.
Open in all findingsRequest a correction
lowAlibaba Cloud OSS bucket reference1 occurrence

Interpretation & review guidance

An Alibaba Cloud OSS bucket reference. Normal to use object storage; risky only if the bucket ACL allows public read/list.

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 7 categories

Privacy

68 requested permissions · 6 flagged high-risk classes.

Review privacy signals →

Build & components

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

Inspect build evidence →
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Findings

7 categories · 11 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
mediumcom.squareup.okhttp3:okhttp 3.12.13 — 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.

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Link to categoryRequest a correction
lowAlibaba Cloud OSS bucket reference1 occurrence

Interpretation & review guidance

An Alibaba Cloud OSS bucket reference. Normal to use object storage; risky only if the bucket ACL allows public read/list.

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
assets/whiteboard/main.e819092e.js
Recorded match
Pattern recorded; identifying value redacted.
Detector rule
alibaba_oss
Recorded file locations
  • assets/whiteboard/main.e819092e.js

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
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.

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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.

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

Link to categoryRequest a correction
lowFirebase Storage bucket reference2 occurrences

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
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
resources.arsc
Recorded match
Pattern recorded; identifying value redacted.
Detector rule
firebase_storage_bucket
Recorded file locations
  • resources.arsc

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.

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Link to categoryRequest a correction
lowGoogle API key (client-shipped; restriction unverified)4 occurrences

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
4 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
classes4.dex
Recorded match
AIza•••••••• (21–40 chars, redacted)
Detector rule
google_api_key
Recorded file locations
  • classes4.dex

4 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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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 permissions68
Flagged high-risk classes6
Detected SDKs22

Precise location Approx. location Camera Microphone Calendar Draw over other apps

Requested permission inventory (68)
  • android.permission.ACCESS_ADSERVICES_AD_ID
  • android.permission.ACCESS_ADSERVICES_ATTRIBUTION
  • android.permission.ACCESS_ADSERVICES_TOPICS
  • android.permission.ACCESS_COARSE_LOCATION
  • android.permission.ACCESS_FINE_LOCATION
  • android.permission.ACCESS_LOCATION_EXTRA_COMMANDS
  • android.permission.ACCESS_NETWORK_STATE
  • android.permission.ACCESS_NOTIFICATION_POLICY
  • android.permission.ACCESS_WIFI_STATE
  • android.permission.BLUETOOTH_SCAN
  • android.permission.BROADCAST_STICKY
  • android.permission.CAMERA
  • android.permission.CHANGE_NETWORK_STATE
  • android.permission.CHANGE_WIFI_STATE
  • android.permission.FOREGROUND_SERVICE
  • android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK
  • android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION
  • android.permission.FOREGROUND_SERVICE_MICROPHONE
  • android.permission.INTERACT_ACROSS_USERS
  • android.permission.INTERACT_ACROSS_USERS_FULL
  • android.permission.INTERNET
  • android.permission.KILL_BACKGROUND_PROCESSES
  • android.permission.MODIFY_AUDIO_SETTINGS
  • android.permission.POST_NOTIFICATIONS
  • android.permission.READ_CALENDAR
  • android.permission.READ_MEDIA_VISUAL_USER_SELECTED
  • android.permission.RECEIVE_BOOT_COMPLETED
  • android.permission.RECEIVE_USER_PRESENT
  • android.permission.RECORD_AUDIO
  • android.permission.REORDER_TASKS
  • android.permission.SCHEDULE_EXACT_ALARM
  • android.permission.SYSTEM_ALERT_WINDOW
  • android.permission.SYSTEM_OVERLAY_WINDOW
  • android.permission.USE_CREDENTIALS
  • android.permission.VIBRATE
  • android.permission.WAKE_LOCK
  • android.permission.WRITE_CALENDAR
  • com.amazon.privacypass.ATTEST
  • com.android.launcher.permission.INSTALL_SHORTCUT
  • com.android.launcher.permission.READ_SETTINGS
  • com.android.launcher.permission.UNINSTALL_SHORTCUT
  • com.android.vending.BILLING
  • com.asus.msa.SupplementaryDID.ACCESS
  • com.asus.permission.READ_SDID_PROVIDER
  • 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
  • com.hellotalk.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
  • com.hellotalk.permission.C2D_MESSAGE
  • com.hellotalk.permission.KUIKLY_NOTIFY
  • com.hellotalk.permission.MAPS_RECEIVE
  • com.hellotalk.permission.MIPUSH_RECEIVE
  • com.hihonor.android.launcher.permission.CHANGE_BADGE
  • com.huawei.android.launcher.permission.CHANGE_BADGE
  • com.huawei.android.launcher.permission.READ_SETTINGS
  • com.huawei.android.launcher.permission.WRITE_SETTINGS
  • com.huawei.appmarket.service.commondata.permission.GET_COMMON_DATA
  • com.nemu.oaid.permission.read
  • com.nemu.oaid.permission.write
  • com.oplus.ocs.permission.third
  • com.samsung.android.mapsagent.permission.READ_APP_INFO
  • com.vivo.abe.permission.launcher.notification.num
  • com.vivo.identifier.permission.OAID_STATE_DIALOG
  • com.vivo.notification.permission.BADGE_ICON
  • freemme.permission.msa
  • freemme.permission.msa.SECURITY_ACCESS
  • oplus.permission.settings.LAUNCH_FOR_EXPORT

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

Data the app can access
Calendar
CalendarCalendar (write)
Camera
Camera
Location
Approximate locationPrecise location
Microphone
Microphone
Photos & files
Storage (write)Storage
Persistent identifiers (referenced in code)
Advertising ID (AAID)Android IDDevice ID / IMEISubscriber ID (IMSI)SIM serialHardware MAC address
Where it can go
Third parties present (19)
AppLovinChartboostGoogle AdMobInMobiMeta Audience NetworkMintegralPangle (ByteDance)TapjoyUnity AdsVungleYandex AdsironSourceGoogle Analytics for FirebaseGoogle Firebase AnalyticsGoogle Tag ManagerMeta / Facebook SDKAdjustAppsFlyerBranch
  • Approximate location, Precise location requested while 15 ad/attribution SDK(s) are present (AppLovin, Chartboost, Google AdMob +12 more) — location commonly feeds ad targeting.
  • Persistent-identifier APIs referenced in code (Advertising ID (AAID), Android ID, Device ID / IMEI +3 more) with 19 analytics/ad SDK(s) present — the mechanism used for cross-app profiling.
  • Calendar, Camera, 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 (22 detected · privacy signal, not part of the grade)

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

Build & components

Scanned build 6.4.20. Store metadata may describe a newer release.

APK SHA-2565a91bb6202a5d45ee7d762d7b823c7009664bded415b553d090f253facf4d23b

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

Signer
jy self-signed
Scheme
V3V2
Key
RSA 2048-bit
Algorithm
sha256WithRSA
Validity
2012-10-16 → 2067-07-20
Cert SHA-256
78:1f:1f:70:ec:b1:16:e3:a6:59:d6:75:ca:36:b9:98:7e:db:72:22:07:86:20:f8:93:4a:77:42:31:d8:e6:10

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

136 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-compose1.13.0None recorded
androidx.activity:activity-ktx1.13.0None recorded
androidx.annotation:annotation-experimental1.5.0None recorded
androidx.appcompat:appcompat1.7.1None recorded
androidx.appcompat:appcompat-resources1.7.1None recorded
androidx.asynclayoutinflater:asynclayoutinflater1.0.0None recorded
androidx.autofill:autofill1.0.0None recorded
androidx.browser:browser1.8.0None recorded
androidx.camera.featurecombinationquery:featurecombinationquery1.6.1None recorded
androidx.camera.viewfinder:viewfinder-core1.5.1None recorded
androidx.camera:camera-camera21.6.1None recorded
androidx.camera:camera-camera2-pipe1.6.1None recorded
androidx.camera:camera-core1.6.1None recorded
androidx.camera:camera-lifecycle1.6.1None recorded
androidx.camera:camera-video1.6.1None recorded
androidx.camera:camera-view1.6.1None recorded
androidx.cardview:cardview1.0.0None recorded
androidx.compose.animation:animation1.10.5None recorded
androidx.compose.animation:animation-core1.10.5None recorded
androidx.compose.foundation:foundation1.10.5None recorded
androidx.compose.foundation:foundation-layout1.10.5None recorded
androidx.compose.material:material1.10.5None recorded
androidx.compose.material:material-ripple1.10.5None recorded
androidx.compose.runtime:runtime1.10.5None recorded
androidx.compose.runtime:runtime-annotation1.10.5None recorded
androidx.compose.runtime:runtime-livedata1.10.5None recorded
androidx.compose.runtime:runtime-retain1.10.5None recorded
androidx.compose.runtime:runtime-saveable1.10.5None recorded
androidx.compose.ui:ui1.10.5None recorded
androidx.compose.ui:ui-geometry1.10.5None recorded
androidx.compose.ui:ui-graphics1.10.5None recorded
androidx.compose.ui:ui-text1.10.5None recorded
androidx.compose.ui:ui-tooling-preview1.10.5None recorded
androidx.compose.ui:ui-unit1.10.5None recorded
androidx.compose.ui:ui-util1.10.5None recorded
androidx.constraintlayout:constraintlayout2.2.0None recorded
androidx.constraintlayout:constraintlayout-compose1.1.1None recorded
androidx.coordinatorlayout:coordinatorlayout1.1.0None 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:credentials1.3.0None recorded
androidx.credentials:credentials-play-services-auth1.3.0None recorded
androidx.cursoradapter:cursoradapter1.0.0None recorded
androidx.customview:customview1.1.0None recorded
androidx.customview:customview-poolingcontainer1.0.0None recorded
androidx.databinding:baseAdapters8.13.2None recorded
androidx.databinding:databindingKtx8.13.2None recorded
androidx.databinding:library8.13.2None recorded
androidx.databinding:viewbinding9.2.1None 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:drawerlayout1.1.1None recorded
androidx.dynamicanimation:dynamicanimation1.1.0None recorded
androidx.emoji2:emoji21.4.0None recorded
androidx.emoji2:emoji2-views-helper1.4.0None recorded
androidx.exifinterface:exifinterface1.4.2None recorded
androidx.fragment:fragment1.5.1None recorded
androidx.fragment:fragment-ktx1.8.9None recorded
androidx.graphics:graphics-path1.0.1None recorded
androidx.graphics:graphics-shapes1.0.1None 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-extensions2.2.0None recorded
androidx.lifecycle:lifecycle-livedata2.10.0None recorded
androidx.lifecycle:lifecycle-livedata-core2.10.0None recorded
androidx.lifecycle:lifecycle-livedata-core-ktx2.10.0None recorded
androidx.lifecycle:lifecycle-livedata-ktx2.10.0None recorded
androidx.lifecycle:lifecycle-process2.10.0None recorded
androidx.lifecycle:lifecycle-runtime2.10.0None recorded
androidx.lifecycle:lifecycle-runtime-compose2.10.0None recorded
androidx.lifecycle:lifecycle-runtime-ktx2.10.0None recorded
androidx.lifecycle:lifecycle-service2.10.0None recorded
androidx.lifecycle:lifecycle-viewmodel2.10.0None recorded
androidx.lifecycle:lifecycle-viewmodel-compose2.10.0None recorded
androidx.lifecycle:lifecycle-viewmodel-ktx2.10.0None recorded
androidx.lifecycle:lifecycle-viewmodel-savedstate2.10.0None recorded
androidx.loader:loader1.1.0None recorded
androidx.localbroadcastmanager:localbroadcastmanager1.0.0None recorded
androidx.media:media1.7.0None recorded
androidx.metrics:metrics-performance1.0.0None recorded
androidx.navigation:navigation-common2.7.7None recorded
androidx.navigation:navigation-common-ktx2.7.7None recorded
androidx.navigation:navigation-fragment2.7.7None recorded
androidx.navigation:navigation-fragment-ktx2.7.7None recorded
androidx.navigation:navigation-runtime2.7.7None recorded
androidx.navigation:navigation-runtime-ktx2.7.7None recorded
androidx.navigationevent:navigationevent1.0.2None recorded
androidx.navigationevent:navigationevent-compose1.0.2None recorded
androidx.paging:paging-runtime3.1.1None recorded
androidx.palette:palette1.0.0None recorded
androidx.palette:palette-ktx1.0.0None 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:profileinstaller1.4.1None recorded
androidx.recyclerview:recyclerview1.3.2None recorded
androidx.room:room-ktx2.8.4None recorded
androidx.room:room-runtime2.8.4None recorded
androidx.savedstate:savedstate1.4.0None recorded
androidx.savedstate:savedstate-compose1.4.0None recorded
androidx.savedstate:savedstate-ktx1.4.0None recorded
androidx.slidingpanelayout:slidingpanelayout1.2.0None recorded
androidx.sqlite:sqlite2.6.2None recorded
androidx.sqlite:sqlite-framework2.6.2None recorded
androidx.startup:startup-runtime1.2.0None recorded
androidx.swiperefreshlayout:swiperefreshlayout1.0.0None recorded
androidx.tracing:tracing1.3.0None recorded
androidx.tracing:tracing-ktx1.3.0None recorded
androidx.transition:transition1.6.0None recorded
androidx.vectordrawable:vectordrawable1.2.0None recorded
androidx.vectordrawable:vectordrawable-animated1.2.0None recorded
androidx.versionedparcelable:versionedparcelable1.1.1None recorded
androidx.viewpager2:viewpager21.1.0None recorded
androidx.viewpager:viewpager1.0.0None recorded
androidx.webkit:webkit1.16.0None recorded
androidx.window:window1.5.1None recorded
androidx.window:window-core1.5.1None recorded
androidx.window:window-java1.0.0None recorded
androidx.work:work-runtime2.7.1None recorded
androidx.work:work-runtime-ktx2.7.1None recorded
com.google.android.material:material1.13.0None recorded
com.google.dagger:dagger2.59None recorded
com.squareup.okhttp3:okhttp3.12.13
1 match

CVE-2021-0341 · medium
Improper hostname verification in certain configurations could allow certificate spoofing / pinning bypass.
Fixed version: 4.9.2

kotlinx:coroutines_android1.10.2None recorded
kotlinx:coroutines_core1.10.2None recorded
kotlinx:coroutines_guava1.10.2None recorded
kotlinx:coroutines_play_services1.10.2None recorded
kotlinx:coroutines_slf4j1.10.2None recorded
Export SBOM
About this app · store information

About this app

Language learning app, language exchange and practice with native speakers!

Content ratingTeen
Download size201.7 MB
Privacy policyPublished →
Developer sitewww.hellotalk.com

Screenshots

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Scan history

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

Scanned (UTC)BuildScoreGrade
2026-10-12 23:36 UTC6.4.2083B
2026-10-05 23:32 UTC6.4.2083B
2026-09-28 23:29 UTC6.4.2083B
2026-09-20 16:42 UTC6.4.1083B
2026-09-08 06:06 UTC6.4.1083B

View changes between the last two scans →

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SARIFFindings CSVCoverage JSONSigned evidenceSBOM

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