https://whitenoise.now/

White noise helps my baby sleep quicker and a little longer. All the available options online look like they were built in the 2000s.

My biggest pain with those apps is setting timer takes more than 2 clicks and they don't remember my last setting.

Now, with this app, one can simply swipe to set timer. Once loaded it works offline, installable as a PWA.

Uses AudioContext web API to generate the noise.

Source code: https://github.com/vicke4/whitenoise