On: MyNoise – Background Noise Generators

[weekay]

On iOS you could also use the native built in background noise functionality which is good.

Go to Settings > Accessibility > Audio/Visual > Background Sounds, then turn on Background Sounds.

Rain , Stream and Ocean are my favourite while needing to focus

[brycewray → weekay]

True. I honestly don't remember whether those were available when I started using MyNoise (late 2014); but, in any event, I've paid for it already and have downloaded quite a few of the sound choices.