Slo is described as 'Discover the ultimate app to help you relax, sleep better, and focus with ease. Noise offers a variety of soothing sounds, including brown noise, rain, and nature sounds, to create the perfect environment for meditation, sleep, or stress relief' and is an app. There are more than 50 alternatives to Slo for a variety of platforms, including Android, iPhone, Web-based, iPad and Windows apps. The best Slo alternative is Blanket, which is both free and Open Source. Other great apps like Slo are Noice, myNoise, Calm and SoundAura.