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A white noise app that just works™. And doesn't have ads.
I have tinnitus and I need relaxing white noise to fall asleep. I find that standing fans work best. The app that I was using for years added ads, which is laughably greedy for an app like this. It's also weirdly complex with alarms and ways to mix sound and whatnot. I think you just need a sound selector and a play button. Maybe a timer.
So it's intentionally simple: five sounds, a timer, and background playback. Design was done by a Stitch and Gemini 3.0 tandem, with some minor modifications by Opus 4.6. Coding was done by Opus 4.6 and GPT 5.4.
It's my first rodeo into publishing Android apps as well, and €25 and a lot of verification steps later, it's live on Google Play. iOS is out of scope to avoid the €99/year Apple Developer fee for what is essentially a free app with no revenue model.
In terms of audio, Pixabay had a bunch of royalty-free sounds that did the job pretty well. One exception
was the standing fan noise. I couldn't find one that looped well and provided
steady noise. They were all either low quality, or had annoying clicking noises.
Turns out Opus is pretty good at sound generation and I ended up just generating
one. I don't think I'd be able to differentiate between that and a real-life
fan in a blind test. The Pixabay downloads all had different loudness levels
so I normalized with ffmpeg, and also trimmed the start and
finish slightly to make it loop more fluidly.