The Happiest Baby App serves as an essential mobile companion for users of the SNOO Smart Sleeper and SNOObie Smart Soother. Developed by pediatrician Dr. Harvey Karp, the app enhances the functionality of these devices, which are designed to help babies sleep more soundly. The SNOO Smart Sleeper automatically responds to a baby's needs, calming them with soothing sounds and motions that mimic the womb. The app features a sleep tracking log, alerts for when a baby may need additional care, and customizable settings to adjust motion and sound levels.

In addition to the SNOO, the SNOObie Smart Soother functions as a versatile white noise machine and nightlight. Users can create personalized routines with various light colors and soothing sounds, promoting calming bedtime rituals. The app requires a Wi-Fi connection for the SNOO and an NFC-enabled device for SNOObie, ensuring seamless integration with Happiest Baby products. This app significantly aids in establishing effective sleep patterns for both babies and parents.