ElevenLabs and Poly.ai are advanced conversational AI platforms that offer customizable voice agents with varying strengths. ElevenLabs stands out with its in-house text-to-speech (TTS) and speech-to-text (STT) models, providing latency and voice quality advantages, along with support for over 70 languages and an extensive voice library. Poly.ai, on the other hand, excels in creating branded AI agents capable of natural, real-time customer interactions, supporting 12 languages and easily integrating with existing business systems. Both platforms support API and telephony integrations, making them suitable for enhancing customer engagement. While ElevenLabs emphasizes extensive voice customization and language capabilities, Poly.ai focuses on natural language understanding and customer relationship management (CRM) integration, with both platforms offering robust data retention and privacy measures. The choice between them depends on specific requirements, budget, and use cases, with ElevenLabs being ideal for diverse applications needing advanced TTS technology and Poly.ai catering to enterprises focusing on branded customer service interactions.