What are some alternatives?
When comparing Noisli and kitefaster.com Deep Sleep Sounds, you can also consider the following products
Noizio - Feeling that the noise of the big city is too much for you to bear?
A Soft Murmur - Ambient sounds to wash away distraction.
Defonic - Create a unique sound environment at home or in the office
Rainy Mood - Rainy Mood is the world's most popular rain simulator. Sleep, study, and relax with the sound of rain.
MyNoise - Custom shaped online noise machines. Many Many generic sounds
Aura Soundscape Player - Modern tools for modern applications.