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Deepgram
Deepgram provides a high-accuracy, low-latency speech-to-text API built for production voice AI applications. Its Nova-3 model delivers real-time streaming transcription at $0.0077/min and batch transcription at $0.0043/min, with $150 in free credits to start. Beyond transcription, Deepgram offers text-to-speech, speaker diarization, sentiment analysis, and a Voice Agent API that bundles STT, LLM routing, and TTS into a single WebSocket session. The platform is widely used as the STT backbone inside Retell AI, Vapi, and Pipecat pipelines.
Solid choice for most workflows
You need ultra-low-latency, high-accuracy speech-to-text for real-time voice AI agents without compromising speed or reliability.
Top-tier accuracy and <300ms latency in production; handles noisy audio well but add-ons like diarization cost extra ($0.002/min).[1][6]
You want a single API to bundle STT, LLM routing, and TTS for full voice agent orchestration without gluing multiple services.
Seamless real-time conversations at scale; flexible pricing rewards custom LLMs/TTS but concurrency caps at 45-60 sessions.[1][2]
You require production-grade audio intelligence like sentiment, topics, or summarization on transcribed speech without separate LLM calls.
Fast, cheap insights on top of core STT; accurate for English but lacks translation and diarization is separate add-on.[1][4]
Concurrency Limits on Free/PayGo
PayGo caps STT at 100 REST/225 WSS, TTS/Voice Agent at 45-60; hits blocks during scale tests—upgrade to Growth for higher limits or monitor usage.
Deepgram wins on raw STT speed/accuracy; Gladia bundles diarization cheaper.
Pick Deepgram for lowest-latency streaming STT backbone in high-scale agents.
Choose Gladia for all-in-one pricing with built-in diarization/no add-on fees.[4]
Trust Breakdown
What It Actually Does
Deepgram turns spoken audio into accurate text for live calls or recorded files, powering apps like voice assistants, customer support, and medical notes.[1][2][3]
Deepgram provides a high-accuracy, low-latency speech-to-text API built for production voice AI applications. Its Nova-3 model delivers real-time streaming transcription at $0.0077/min and batch transcription at $0.0043/min, with $150 in free credits to start. Beyond transcription, Deepgram offers text-to-speech, speaker diarization, sentiment analysis, and a Voice Agent API that bundles STT, LLM routing, and TTS into a single WebSocket session.
The platform is widely used as the STT backbone inside Retell AI, Vapi, and Pipecat pipelines.
Fit Assessment
Best for
- ✓speech-to-text
- ✓text-to-speech
- ✓voice-agent
Connection Patterns
Blueprints that include this tool:
Score Breakdown
Protocol Support
Capabilities
Governance
- api-key-auth
- encryption-in-transit
- encryption-at-rest
- role-based-access-control
- two-factor-authentication
- pii-masking
- https-only
Pricing
Workflow Fit
Related Concepts
Related Categories
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