Free AI Tools for voice agents

Cartesia builds fast speech AI models and voice agents for real-time text-to-speech, transcription, and interactive conversations.

AssemblyAI provides speech-to-text, speech understanding, voice agent, and LLM gateway APIs for building voice AI products.

Deepgram provides enterprise voice AI APIs for speech-to-text, text-to-speech, and voice agents in one platform.

ElevenLabs is an AI audio platform for text-to-speech, voice cloning, dubbing, speech-to-text, music, and voice agents.