Sproochentest open-source licences

What this page covers

15 projects across 58 individual modules, all of them inside the copy of Sproochentest you install.

The list comes from the app’s own build configuration rather than from memory. Libraries used only to build or test the app are left out, because they are not in what you install, and so are version-alignment artefacts, which contain no code of their own.

Apache License 2.0

A permissive licence. It lets us include the library in a closed-source app, and asks in return that we keep the copyright notice and say what the licence is — which is what this page does.

Read the full terms

AndroidX and Jetpack Compose

The Android UI toolkit itself. Every app here is built on it, though which pieces each app uses differs.

androidx.activity:activity-compose
androidx.appcompat:appcompat
androidx.browser:browser
androidx.camera:camera-camera2
androidx.camera:camera-core
androidx.camera:camera-lifecycle
androidx.camera:camera-view
androidx.compose.animation:animation
androidx.compose.foundation:foundation
androidx.compose.material3:material3
androidx.compose.material:material-icons-core
androidx.compose.material:material-icons-extended
androidx.compose.ui:ui
androidx.compose.ui:ui-graphics
androidx.compose.ui:ui-text-google-fonts
androidx.compose.ui:ui-tooling-preview
androidx.core:core-ktx
androidx.core:core-splashscreen
androidx.credentials:credentials
androidx.credentials:credentials-play-services-auth
androidx.datastore:datastore-preferences
androidx.exifinterface:exifinterface
androidx.fragment:fragment
androidx.fragment:fragment-ktx
androidx.glance:glance-appwidget
androidx.lifecycle:lifecycle-process
androidx.lifecycle:lifecycle-runtime-compose
androidx.lifecycle:lifecycle-runtime-ktx
androidx.lifecycle:lifecycle-viewmodel-compose
androidx.media3:media3-exoplayer
androidx.media3:media3-exoplayer-hls
androidx.media3:media3-ui
androidx.navigation:navigation-compose
androidx.room:room-ktx
androidx.room:room-runtime
androidx.work:work-runtime
androidx.work:work-runtime-ktx

Kotlin standard library

Added by the Kotlin compiler rather than declared by us, but it ships in every app, so it belongs on this list.

org.jetbrains.kotlin:kotlin-stdlib

kotlinx.coroutines

org.jetbrains.kotlinx:kotlinx-coroutines-core
org.jetbrains.kotlinx:kotlinx-coroutines-android

OkHttp

com.squareup.okhttp3:okhttp
com.squareup.okhttp3:logging-interceptor

Retrofit

com.squareup.retrofit2:retrofit
com.squareup.retrofit2:converter-gson

Gson

com.google.code.gson:gson

Coil

io.coil-kt:coil-compose

Firebase Android SDK

The client libraries are open source; the hosted services they talk to are Google's, and what they do with data is set out in the app's privacy policy.

com.google.firebase:firebase-auth
com.google.firebase:firebase-firestore
com.google.firebase:firebase-storage
com.google.firebase:firebase-appcheck-playintegrity

GPL v2 with the Classpath Exception

The licence OpenJDK uses. The Classpath Exception is the important part: it explicitly permits linking this library into an application without that application becoming subject to the GPL. So the app itself is unaffected, and the obligation is to name the library — here.

Read the full terms

Java 8+ API desugaring support (desugar_jdk_libs)

Backports modern Java date and time classes so they work on older versions of Android.

com.android.tools:desugar_jdk_libs

Google's own SDK terms

Not an open-source licence. These are Google's proprietary libraries, used under the terms Google sets for them, and those terms require that Google's legal notices be shown to users. They are listed separately for that reason — calling them "open source" would be untrue.

Read the full terms

Google Mobile Ads SDK (AdMob)

What it collects, and how to opt out of personalised ads, is set out in each app's privacy policy.

com.google.android.gms:play-services-ads

Google User Messaging Platform

This is the consent prompt itself — the thing that asks permission before any personalised advertising.

com.google.android.ump:user-messaging-platform

Google Identity for Credential Manager

The Google sign-in itself. It is optional in the app, and there is a page explaining how to delete the account it creates.

com.google.android.libraries.identity.googleid:googleid

Google Play Billing Library

Handles the payment. Google processes it; we never see a card number.

com.android.billingclient:billing-ktx

Google Play In-App Review

com.google.android.play:review
com.google.android.play:review-ktx

Google reCAPTCHA for Android

Used to tell a person from a script when an account is created, which is why the app can offer sign-in without also collecting more about you.

com.google.android.recaptcha:recaptcha

Open source is not the same as free of terms

A distinction worth making plainly, because attribution pages often blur it. Most of what is above is genuinely open source, published under a permissive licence by people who chose to give it away. Google’s Play services libraries — advertising, billing, the consent prompt, machine learning — are not. They are proprietary software used under Google’s own terms, listed in a section of their own rather than folded in among the rest. Calling them open source would be untrue.

The other documents

Sproochentest privacy policy
What the app collects, what it does not, and who else is involved.
Licences across every app
The same notice for the whole catalogue, with each library shown against the apps it is in.

Open-source licences