Deepgram
AI Voice
Speech-to-text and voice agent APIs with very low latency.
Low-latency speech API built for real-time voice agents.
Cartesia focuses on latency rather than only quality, targeting sub-300-millisecond speech-to-speech response for live voice agents. Its Sonic model family and PlayHT voice library are widely used in conversational telephony.
Free tier available; usage priced per character
Pricing is taken from the vendor's own published rates. Always confirm on their site before purchasing.
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