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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Documentation & Developer Resources
Deepgram provides an API-first developer experience. Key integration points include:
- REST & WebSocket APIs for STT (batch and real-time streaming), TTS, and the unified Voice Agent API
- Self-hosted deployment documentation for on-premises and private cloud setups
- Amazon Connect integration for contact center deployments
- Open-source SDKs and tooling available on GitHub (823 stars)
- Audio Intelligence & analytics endpoints for speaker diarization, sentiment, summarization, and related features
- 45+ language configuration options across models
Developers can get started immediately using the free tier ($200 credit, no upfront commitment). The Nova-3 model is the current flagship STT model for streaming, priced from $0.0048/min. TTS and Voice Agent API pricing is usage-based.
Refer to Deepgram's official documentation portal for SDK references, API schemas, authentication guides, and model selection details.
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