Vapi's platform, in collaboration with Hume AI, provides developers with a streamlined solution for creating conversational voice agents in phone calling applications, integrating Hume's Octave TTS for real-time expressive text-to-speech at a low latency of 150ms and competitive pricing of 2¢/minute. This integration not only offers significant performance and cost improvements but also allows developers to focus on application logic by simplifying the complex orchestration of speech recognition, language, and voice synthesis models. Vapi's commitment to optimizing speed, reliability, and affordability has led to a 41% cost reduction and a 66% latency improvement, making it an attractive option for developers focusing on realistic, expressive speech and cost efficiency. The platform's enhanced expressiveness, with emotionally aware voice outputs, has been widely adopted by developers across various industries, such as healthcare, customer service, and education, who value the combination of affordability and emotional expressiveness. Alan Cowen, CEO of Hume AI, emphasizes that the partnership with Vapi demonstrates that developers can achieve both emotional intelligence and practical constraints like cost and speed without compromise, making the EVI integration a compelling choice for building advanced voice AI applications.