AI Sales Index

Vapi

Developer-first voice AI infrastructure for building ultra-low-latency calling agents.

Vapi's AI Sales Index badge Ranked #1 of 16 in Voice AI & Inbound Calling by Autonomous Execution Score. Top 3 tools earn a ranked badge. How badges work →
Visit vapi.ai

Vapi is an autonomous voice AI and telephony agent platform starting at $0/month. It achieves an Autonomous Execution Score of 73/100 and integrates natively with Twilio, Vonage, OpenAI. Its key operational strength is sub-500ms voice response latency, while primary tradeoffs include requires developer implementation.

Autonomy
73/100
Core 83 · -10 setup
Value
7.01
From
$0/mo
Pricing
freemium
Updated
Nov 2026

Strengths

  • Sub-500ms voice response latency
  • Bring-your-own-keys support for LLMs and TTS
  • Native SIP trunking

Tradeoffs

  • Requires developer implementation
  • Usage costs scale dynamically with minutes

Integrations

  • Twilio
  • Vonage
  • OpenAI
  • Deepgram
  • Cartesia
Engineering Setup Required: Requires developer API setup, bring-your-own LLM keys, and telephony webhooks (-10 points deducted from runtime autonomy).

Estimate your monthly cost

$90/mo

On the Pay as you go plan. Lowest listed stack: $0.05 hosting, Deepgram, OpenAI and ElevenLabs at their lowest rates, plus Twilio inbound.

How this score is built

Autonomy base
(100 − 15 human effort) × 0.8
Integrations
+15
Setup friction
−10
Value inputs
28 features, 4.9 rating

Human effort, feature count and rating are editorial estimates, not test results.

Evidence

Price checked Nov 2026. View source

Vendor states: HIPAA (paid add-on).

Vapi alternatives

ToolAutonomyValueFrom
Deepgram Speech-to-text and conversational voice AI infrastructure delivering real-time transcription and voice agent APIs.735.89$0/moCompare ↗
LiveKit End-to-end real-time multimodal WebRTC infrastructure powering sub-200ms voice AI agents.727.52$0/moCompare ↗
Dapta Speed-to-lead voice AI agent that automatically calls inbound web leads within 30 seconds to qualify and book meetings.724.08$99/moCompare ↗
Retell AI Voice engine for conversational AI with native speech-to-speech models and turn-taking logic.725.40$0/moCompare ↗
Daily Real-time voice and video APIs with optimized serverless runtimes for conversational AI bots.716.63$0/moCompare ↗
Cartesia State-space voice intelligence platform powering real-time conversational agents with sub-100ms TTS latency.705.01$0/moCompare ↗

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