Deepgram
Free tierThe most accurate and cost-effective real-time APIs for speech-to-text, text-to-speech, and voice agents
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Deepgram offers a suite of REST and WebSocket APIs covering Speech-to-Text (STT), Text-to-Speech (TTS), a unified Voice Agent API, and Audio Intelligence. The Voice Agent API eliminates the need to stitch together separate STT, LLM, and TTS components by unifying them into a single low-latency pipeline with built-in business logic and external system hooks. Models include Nova (transcription) and Flux (multilingual conversational STT supporting 10 languages). The platform is available as a managed cloud service or as a self-hosted deployment for enterprises with strict compliance or data residency requirements.
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