SoundAiSleep, an innovative app launched in 2023 by Coco Shellim and Leli Leitner, allows parents to create personalized AI-narrated audiobooks using their own voices, helping children fall asleep more easily. The app's rapid growth is attributed to its partnership with ElevenLabs, which provides advanced voice cloning technology that produces realistic synthetic voices. ElevenLabs was chosen for its cost-effectiveness, customizable features, and the ease of integration with SoundAiSleep's platform, making it accessible for time-pressed parents. The partnership has been pivotal, offering tiered pricing that supports start-ups, a tailored start-up grant, and a smooth API integration process. This collaboration enables parents to convert short voice recordings into full-length audiobooks quickly and affordably, allowing children to enjoy bedtime stories even in their parents' absence.