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ANALYSIS VERDICT

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

Metric / Feature
Autonomy Score (AES)
73/100
Core 83 · -10 setup
73/100
Core 83 · -10 setup
Value-to-Cost Ratio5.897.01
Starting Price$0/mo$0/mo
Pricing Modelfreemiumfreemium
Primary Strengths
  • Industry-benchmark Nova-3 speech recognition accuracy
  • Aura ultra-low latency voice synthesis
  • Free tier with initial usage credits
  • Sub-500ms voice response latency
  • Bring-your-own-keys support for LLMs and TTS
  • Native SIP trunking
Tradeoffs
  • Pure developer API requiring backend orchestration
  • Requires pairing with an external LLM provider
  • Requires developer implementation
  • Usage costs scale dynamically with minutes
Common Integrations

Twilio

Unique Integrations

WebSockets, SIP, LiveKit, API

Vonage, OpenAI, Deepgram, Cartesia

Pricing tier comparison

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

Vapi tiers

Pricing tiers unlisted.

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