The scene, the sound and the app are mine, but the letters you are reading them in are not, and neither is the plumbing underneath. Here is what the app is built on and what those licences ask for in return.
The serif in the title and in this paragraph. Copyright 2018 The Fraunces Project Authors, by Undercase Type. Licensed under the SIL Open Font License, Version 1.1.
The monospace used for labels, settings and the clock. Copyright 2020 The DM Mono Project Authors, by Colophon Foundry for Google Fonts. Also licensed under the SIL Open Font License, Version 1.1.
Both are embedded in the app and served from this site rather than loaded from a font service, so nothing about your visit goes anywhere else.
Under the MIT licence: Capacitor and its iOS runtime (Copyright 2017 to present, Drifty Co.); the Capacitor plugins for Filesystem (Copyright 2025 Ionic), and for Haptics, Local Notifications, Share, Splash Screen and Status Bar (Copyright 2020 to present, Ionic); Keep Awake (Copyright 2019 The keep-awake developers); and RevenueCat, both the Capacitor plugin and the iOS SDK (Copyright 2023 RevenueCat, Inc.).
Under the Apache License 2.0: Apache Cordova, which Capacitor bundles for plugin compatibility, Copyright The Apache Software Foundation.
Every notice above, with the complete licences, is in one file: LICENCES.txt. The same file ships inside the app next to the fonts.
No analytics library, no advertising network, no crash reporter, no third-party UI kit, no audio samples, no images. The water, the rain, the light, the fish and every sound are generated by code written for this app.