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 25 alternatives to Slo for a variety of platforms, including Android, iPhone, Web-based, iPad and Android Tablet apps. The best Slo alternative is Noice, which is both free and Open Source. Other great apps like Slo are myNoise, Blanket, Calm and SoundAura.