I'm a longtime fan of Web-based myNoise: https://mynoise.net/
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So I made Ambi, a small iOS app with a clean interface and a set of freely available ambient sounds — rain, waves, wind, birds, that sort of thing. You can mix them, adjust volume levels, and just let it play all night or while you work. Everything works offline and there are no hidden catches.
It’s something I built for myself first, but I figured others might find it useful too. Feedback, bugs, and suggestions are all welcome.
https://apps.apple.com/app/ambi-white-noise-sleep-sounds/id6...