What are some alternatives?
When comparing Hipster Sound and Noisli, you can also consider the following products
Noizio - Feeling that the noise of the big city is too much for you to bear?
Defonic - Create a unique sound environment at home or in the office
A Soft Murmur - Ambient sounds to wash away distraction.
Studiowave - Chillout tunes and inspiration
Aura Soundscape Player - Modern tools for modern applications.
zenmix.io - Ambient background sound generator