Cartesia
Cartesia is an ultra-low latency real-time text-to-speech API built for voice agents and interactive applications. Sub-80ms synthesis latency, voice cloning, and streaming output. Free plan available. Pro from $39/month.
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Retell AI
Retell AI is a real-time AI voice and chat agent platform that lets you go live in minutes with $10 in free credits. No commitments — build, test, and scale on a pay-as-you-go model. AI Voice Agents from $0.07–$0.31/min. AI Chat Agents from $0.002/msg.
