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ANALYSIS VERDICT

Both Vapi and Deepgram tie on autonomy score (73/100). Select Vapi for sub-500ms voice response latency; consider Deepgram if you prioritize industry-benchmark nova-3 speech recognition accuracy.

Metric / Feature
Autonomy Score (AES)
73/100
Core 83 · -10 setup
73/100
Core 83 · -10 setup
Value-to-Cost Ratio7.015.89
Starting Price$0/mo$0/mo
Pricing Modelfreemiumfreemium
Primary Strengths
  • Sub-500ms voice response latency
  • Bring-your-own-keys support for LLMs and TTS
  • Native SIP trunking
  • Industry-benchmark Nova-3 speech recognition accuracy
  • Aura ultra-low latency voice synthesis
  • Free tier with initial usage credits
Tradeoffs
  • Requires developer implementation
  • Usage costs scale dynamically with minutes
  • Pure developer API requiring backend orchestration
  • Requires pairing with an external LLM provider
Common Integrations

Twilio

Unique Integrations

Vonage, OpenAI, Deepgram, Cartesia

WebSockets, SIP, LiveKit, API

Pricing tier comparison

Vapi tiers

Pricing tiers unlisted.

Deepgram tiers

Pay as you go
$0 /month
  • Free $200 credit, then pay-as-you-go
  • No minimums, no expiration, no credit card required
  • Speech-to-text from $0.0077/min (Flux STT / Nova-3)
  • Text-to-speech from $0.0150/1k characters (Aura-1)
  • Voice Agent API from $0.075/min
  • Up to 150 concurrent streaming STT connections
Growth
$4,000 /year
  • $4,000+ / year pre-paid credits against usage
  • Save up to 20% across STT, TTS, and Voice Agent
  • Up to 225 concurrent streaming connections
  • Volume discounts
Enterprise
Custom /custom
  • Custom volume commitments & discounted rates
  • Self-hosted VPC / on-prem container deployment
  • HIPAA BAA & enterprise SLA
  • Custom concurrency & named account team

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