Quietly includes open-source software developed by third parties. Copyright remains with the respective authors and contributors. The licenses below apply only to the relevant third-party components and do not change the license of Quietly's proprietary code, branding, or assets.
Quietly also integrates Google commercial service SDKs for Analytics, a one-time Pro purchase, free-tier advertising, and advertising privacy choices. Those services are identified separately and are not represented as open-source merely because they are distributed as Android libraries.
If a component-specific notice, source file, or applicable service term conflicts with this summary, the original license, notice, or service term controls.
License names in the table link to canonical license texts. Those links supplement, rather than replace, the full license copies and component-specific notices included below.
For the rules governing the App and its data practices, see the Quietly Terms of Service and Quietly Privacy Policy.
| Component group | Included use | License |
|---|---|---|
| AndroidX Core, Activity, AppCompat, Lifecycle, SavedState, Compose UI, Compose Material, Material 3, Navigation, Room, SQLite integration, ProfileInstaller, Startup, and related AndroidX transitive components | Android runtime, UI, navigation, lifecycle, persistence, and startup optimization | Apache License 2.0 |
| Material Components for Android 1.14.0 | Android Material theming and platform integration | Apache License 2.0 |
| Kotlin standard library 2.3.20, kotlinx.coroutines 1.11.0, and kotlinx.serialization core 1.7.3 | Language runtime, concurrency, and navigation serialization support | Apache License 2.0 |
| Dagger and Hilt 2.58, Hilt Navigation Compose 1.3.0, javax.inject, and Jakarta Inject | Dependency injection | Apache License 2.0 |
| Google and Java annotation/support artifacts, including ListenableFuture, Error Prone annotations, JSR-305, JSpecify, and JetBrains annotations | Transitive runtime and annotation support | Apache License 2.0 |
| Checker Framework checker-qual 3.12.0 | Type-qualifier annotations used by a transitive runtime dependency | MIT License |
| Firebase Android SDK runtime components and Google Analytics for Firebase | Firebase initialization, app-instance support, and product usage measurement | Open-source Firebase Android SDK components: Apache License 2.0. Google Analytics for Firebase is not open source and is governed by the applicable Google Analytics for Firebase terms. Transitive open-source components retain their own licenses. |
| Google Play Billing Library 9.1.0 | Optional one-time lifetime Quietly Pro purchase and entitlement restoration | Google commercial SDK/service; governed by the Google Play Developer Distribution Agreement, Google Play terms, and applicable component notices. It is not declared as Apache-licensed open-source software. |
| Google Mobile Ads SDK 25.4.0 and Google User Messaging Platform SDK 4.0.0 | Consent-gated, non-personalized free-tier inline ads and advertising privacy choices | Google commercial SDK/services; governed by the Google Mobile Ads terms, Google EU User Consent Policy, Google APIs Terms, and applicable component notices. They are not declared as Apache-licensed open-source software. |
| Vico Compose and Material 3 2.0.0 | On-device insight charts | Apache License 2.0 |
| Pretendard 1.3.9 static OTF fonts (400, 500, 600, and 700) | Bundled application typography | SIL Open Font License 1.1 |
| RE2/J 1.8 | Linear-time regular-expression matching | BSD 3-Clause License |
| Android core-library desugaring library 2.1.5 | Java library API compatibility on older Android versions | GNU General Public License, version 2, with the Classpath Exception |
| SQLite native engine bundled through AndroidX SQLite 2.7.0 | On-device database engine | Public domain |
The release dependency review also includes related AndroidX, Firebase, Google Play services, and Google transitive modules. Each component remains governed by its own license or applicable SDK/service terms. This notice was reconciled against Quietly 1.0.0 (versionCode 2) releaseRuntimeClasspath on August 16, 2026. Re-run the audit whenever the release dependency graph changes. Build-only and test-only tools such as the Android Gradle Plugin, Gradle, KSP, JUnit, AndroidX Test, Robolectric, MockK, Turbine, and UI Automator are not embedded in the release App and are not listed as runtime components here.