Apps like Concentration!!

Here are some great alternatives to Concentration!! by 돼지왕왕돼지 :
Brown Noise and Pink Noise
Brown Noise and Pink Noise
★4.3
Noise Wall - Block Noise
Noise Wall - Block Noise
★3.7
Noise Generator
Noise Generator
★4.4
Noise Wall Pro - Block Noise
Noise Wall Pro - Block Noise
★4.5
Fan Noise For Sleeping Bedtime
Fan Noise For Sleeping Bedtime
★3.5
Noise Machine - Green, White
Noise Machine - Green, White
★4.6
Green Noise: ZenTones
Green Noise: ZenTones
★3.3
White Noise Deep Sleep Sounds
White Noise Deep Sleep Sounds
★4.5
White Noise Generator
White Noise Generator
★4.7
White Noise Lite
White Noise Lite
★4.6
White Noise - Sleep And Relax
White Noise - Sleep And Relax
★4.7
White Noise
White Noise
★4.5
White Noise Pro
White Noise Pro
★4.6
White Noise for sleep & relax
White Noise for sleep & relax
★3.8
Sleep Sounds - White Noise HQ
Sleep Sounds - White Noise HQ
★4.2
Baby Sleep - White Noise
Baby Sleep - White Noise
★3.5