If you're on Android and want something similar, try Atmosphere.
For years now it's the first app I install on every phone I buy.
It's ad-supported though.
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...
For years now it's the first app I install on every phone I buy.
It's ad-supported though.