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Open-source real-time audio, video, and AI agent infrastructure. Build video calls, voice chat, and AI voice agents. Used by ChatGPT's Advanced Voice Mode. Valued at $1B. Free: 1,000 agent minutes/month. Ship: $50/month. Scale: $500/month.
Cartesia builds Sonic, a real-time text-to-speech API designed for voice agents and interactive apps. It turns text into natural-sounding speech with emotion, laughter, and human-like pacing in over 40 languages — all with ultra-low latency under 90 milliseconds. The platform supports instant voice cloning from short audio samples, enterprise-grade security (SOC 2, HIPAA, PCI), and developer-friendly APIs and SDKs. Free tier includes 20K credits. Paid plans start at $4/month.
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