Open Source Licenses

Updated October 11, 2026 for the current Android beta. This concise web notice does not replace the license texts distributed with individual components.

Rhythm is built with Android libraries and platform components, including AndroidX Core, Activity, Lifecycle, WorkManager, DataStore, Navigation, Room, Credentials, Jetpack Compose, Material components, Google Play services Location, Firebase Authentication, App Check and Cloud Firestore. The backend uses Firebase Functions and Google APIs libraries. Not every Google SDK is open-source; its applicable distribution terms remain controlling.

Bundled typefaces

Roboto, Noto Serif, Nunito and Atkinson Hyperlegible Next are bundled under the SIL Open Font License 1.1, which permits use in the app, subject to its conditions. Download the notices distributed with this build:

• Roboto license
• Noto Serif license
• Nunito license
• Atkinson Hyperlegible Next license

AndroidX and Jetpack libraries

AndroidX and Jetpack components are provided under their respective open-source licenses, commonly the Apache License 2.0. See the official Android Open Source Project and AndroidX distribution notices for the exact license applicable to each artifact.

Google Play Billing Library

Google Play Billing is provided by Google and is used under Google's applicable SDK and Google Play terms. It is not an open-source feature of Rhythm itself.

Rhythm original content

Except for third-party and open-source components identified by their own licenses, Rhythm's original application code, branding, graphics and documentation remain protected by applicable copyright and intellectual-property law.

© 2026 Rhythm Adaptive Calendar. All rights reserved.

For a production release, Rhythm may also include a complete machine-generated third-party notices file inside the application package or About & Legal section.