Deepgram vs Vapi

Detailed side-by-side comparison to help you choose the right tool

Deepgram

🔴Developer

Voice AI

Speech-to-text, text-to-speech and voice agent APIs with industry-leading latency, accuracy and per-language model quality.

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Starting Price

Free
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Vapi

🔴Developer

Voice AI

Voice AI platform for building phone-calling agents that sound human and integrate with any business system.

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Starting Price

$0.05/minute + provider costs
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Feature Comparison

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FeatureDeepgramVapi
CategoryVoice AIVoice AI
Pricing Plans104 tiers185 tiers
Starting PriceFree$0.05/minute + provider costs
Key Features
  • • Speech-to-text APIs for streaming and prerecorded audio
  • • Flux conversational STT for real-time voice agents with turn detection and interruption handling
  • • Text-to-speech through Aura voices
  • • Build and deploy phone and conversational voice agents
  • • Real-time monitoring and enterprise-grade configurability
  • • Support for customer support, lead qualification, and appointment scheduling

Deepgram - Pros & Cons

Pros

  • ✓Best-in-class word error rate via Nova-3 model across 30+ languages
  • ✓Aggressively priced per-minute: from $0.0043/min beats most rivals
  • ✓Voice Agent API unifies STT + LLM + TTS with server-side turn-taking
  • ✓Free $200 credit lets teams prototype end-to-end without commitment
  • ✓On-prem deployment supports HIPAA and air-gapped environments

Cons

  • ✗Aura TTS voice library smaller than ElevenLabs or Cartesia
  • ✗Documentation can feel dense for first-time integrators
  • ✗Some advanced features (diarisation tuning) require sales conversations
  • ✗Voice agent API still maturing relative to Vapi or Retell AI for high-level orchestration

Vapi - Pros & Cons

Pros

  • ✓Combines telephony, streaming speech, models, tools, and transfers in one developer platform
  • ✓Supports multiple LLM, speech, voice, and carrier providers
  • ✓Function calling enables real business-system actions during calls
  • ✓Usage-based entry point supports small pilots

Cons

  • ✗Base platform fee excludes model, speech, and telephony charges
  • ✗Live calls introduce consent, recording, outbound-contact, and privacy obligations
  • ✗Quality depends on several providers plus prompt and tool design

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🔒 Security & Compliance Comparison

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Security FeatureDeepgramVapi
SOC2✅ Yes✅ Yes
GDPR✅ Yes✅ Yes
HIPAA❌ No✅ Yes
SSO✅ Yes🏢 Enterprise
Self-Hosted—❌ No
On-Prem✅ Yes❌ No
RBAC✅ Yes🏢 Enterprise
Audit Log✅ Yes✅ Yes
Open Source❌ No❌ No
API Key Auth✅ Yes✅ Yes
Encryption at Rest✅ Yes✅ Yes
Encryption in Transit✅ Yes✅ Yes
Data ResidencyUS—
Data Retentionconfigurableconfigurable
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Review DeepgramReview Vapi