Deepgram
Free tierThe most accurate and cost-effective real-time APIs for speech-to-text, text-to-speech, and voice agents
Free tier available·All audiences·Powered by Deepgram·API available
Key strengths
Real-time speech-to-text with ultra-low latencyConversation-aware TTS with turn-taking and interruption handlingUnified Voice Agent API (STT + TTS + LLM orchestration in one call)Self-hosted deployment option45+ language supportAudio Intelligence and analytics
Free tier + paid plans
San Francisco, USA
Founded 2015
Self-hostable
Facts verified against deepgram.com on
Recent changes
- Plans updated: Free tier includes $200 credit then pay-as-you-go. Growth plan starts at $4K+/year with pre-paid credits (save up to 20%). Enterprise pricing available via sales. STT streaming from $0.0048/min (Nova-3), TTS and Voice Agent API usage-based.
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Deepgram — Technical Overview
Deepgram is a Voice AI platform founded in 2016 and headquartered in San Francisco, US. It exposes a unified API surface covering:
- Speech-to-Text (STT): Real-time streaming transcription with ultra-low latency (Nova-3 model from $0.0048/min)
- Text-to-Speech (TTS): Conversation-aware synthesis with turn-taking and interruption handling
- Voice Agent API: A single API call that orchestrates STT + TTS + LLM in one pipeline, reducing integration complexity
Deployment & Infrastructure
- Fully managed cloud API (
api_available: true) - Self-hosted deployment option available for on-premises or private cloud environments
- Open-source components available (823 GitHub stars)
- Integrates with Amazon Connect
- Supports 45+ languages
Pricing Model (usage-based)
- Free tier: $200 credit, then pay-as-you-go
- Growth plan: $4K+/year with pre-paid credits (up to 20% savings)
- Enterprise: custom pricing via sales
- STT streaming: from $0.0048/min (Nova-3); TTS and Voice Agent API are usage-based
Deepgram targets developers, startups, and enterprises building contact centers, conversational AI, and speech analytics pipelines.
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