Lead Qualification
Instantly screen inbound contacts, confirm match criteria, and log results.
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A monday.com company
Harmony.ai is a managed voice AI platform for teams handling 500+ calls a month. White-glove implementation, live in days, every call transcribed and scored. Our own models, built for the phone.
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Harmony.ai vs Vapi
 |  | |
|---|---|---|
| Platform | ||
| Built for | Revenue teams: AI receptionist, AI SDR, scheduling | Developer platform for building voice agents, API-first |
| Model | Our own models, built for the phone | Bring your own: choose the LLM and TTS provider per agent |
| Sounds human | Our own conversation models handle interruptions, timing and tone, so calls feel human | Bring-your-own TTS: ElevenLabs, PlayHT, Cartesia and others, plus your own cloned voices |
| Implementation | White-glove | Self-serve; enterprise deployment support on Scale plan |
| Calling & scale | ||
| Latency | Sub-400ms median response | Sub-500ms average (published) |
| Concurrency | 1 to 10,000 parallel calls | 10 concurrent included, $10 per line/month extra; custom on Scale |
| Telephony | Built-in telephony or bring your own trunks; buy, assign and retire numbers across regions from one inventory; port or forward | Up to 5 free US numbers with daily outbound caps; import Twilio, Vonage or Telnyx numbers or bring a SIP trunk to scale |
| Spam remediation | Number-reputation monitoring, automatic quarantine of flagged numbers, remediation, branded caller ID and local presence | Docs walk you through registering STIR/SHAKEN and CNAM with your own carrier; nothing managed |
| IVR, screeners and gatekeepers | Navigates external phone trees, hold queues and human gatekeepers to reach the right party; DTMF both ways; voicemail detection and retry | DTMF keypad tool for IVR menus, voicemail detection with fallback providers; nothing documented for human gatekeepers |
| Insight & improvement | ||
| Reporting | Funnel, call-flow and conversation analytics on 100% of calls; ask for a report in plain language and get it built on the spot | Analytics dashboard and API with custom queries; call logs and transcripts |
| Self-improvement | Reasoning trace on every call, simulate changes on past calls, agent proposes knowledge-base updates you approve | Manual: review calls, edit the assistant, re-run test suites |
| Experimentation | A/B live or synthetic traffic, publish the winner, roll back; agent keeps what converts across a campaign | Test suites and evals for regression testing; no built-in traffic-split A/B documented |
| Pricing & compliance | ||
| Pricing | Plans start at $3K/month | $0.05/min platform fee plus model costs at cost; HIPAA add-on $2,000/mo |
| Compliance | SOC 2 Type II, HIPAA, GDPR, ISO 27001 | SOC 2, HIPAA (paid add-on), PCI |
Vapi figures from vapi.ai, vapi.ai/pricing and docs.vapi.ai, checked 9 Sep 2026. Vapi is a trademark of its owner. Harmony.ai is not affiliated with Vapi.
Hear it on your own use case.
Four quick questions, then we’ll configure an agent on your use case and let you listen before you commit to anything.
Built for revenue, not a toolkit
Inbound and outbound on one platform. The agent dials, qualifies, and books meetings in your CRM.
Implementation is included
White-glove setup, live in days. No engineering project to stand up telephony, models, and workflows.
Every call becomes data
Every call transcribed and scored. Warm transfers with context, PII redaction, TCPA and DNC aware.
Scale without a quota request
1 to 10,000 parallel calls. Sub-400ms median response at any volume.
Meet Siena, your AI assistant
Enterprise-grade security
Enterprise-grade AI infrastructure with built-in protection and security, data privacy, governance, permissions, and compliance.
