Licences and credits
Credits for the open data and software HolosAccent uses.
Effective 18 October 2026
01
Definitions
Word definitions in the app come from Open English WordNet (en-word.net), based on Princeton WordNet 3.0, under CC BY 4.0. The app credits it under every definition.
02
Practice phrases
Some practice phrases come from an openly licensed corpus that asks to be credited:
| Corpus | What it is | Licence | Credit |
|---|---|---|---|
| Grundwortschatz EN | Basic English vocabulary in example sentences | CC BY-SA 4.0 | cstr (Hugging Face: grundwortschatz-voc-en) |
Phrases from this corpus are quoted as published, without changes.
03
Software
Open-source components inside the HolosAccent app for Android and iOS:
| Component | Licence |
|---|---|
| Kotlin and kotlinx (coroutines, serialization, datetime) | Apache-2.0 |
| Compose Multiplatform, Material 3, Compose resources (JetBrains) | Apache-2.0 |
| AndroidX: Activity, Core, Lifecycle, Navigation, Browser, Security Crypto, Credentials, Media3 | Apache-2.0 |
| Ktor client, OkHttp | Apache-2.0 |
| gRPC (grpc-java OkHttp transport) and kmp-grpc | Apache-2.0 |
| Coil (images and animated images) | Apache-2.0 |
| Konfetti (the confetti) | ISC |
| Google Play Billing, Sign in with Google (Credential Manager, googleid), Play Integrity | Android Software Development Kit License |
| Firebase Cloud Messaging (Android and iOS SDK) | Apache-2.0 |
| Desugar JDK libraries (Java 8+ APIs on older Android) | GPL-2.0 with the Classpath Exception |
| DejaVu Sans (the type inside a shared progress card) | Bitstream Vera licence |
| Inter and JetBrains Mono (the type on this site) | SIL Open Font License 1.1 |
These are the components the app uses directly; each carries its own dependencies under their own licences. Questions: support@holosaccent.app.
Everything else — the app, its wording and the cat and badge artwork — is ours.
© 2026 HolosAccent · holosaccent.app
Last updated 18 October 2026