Lead Qualification
Instantly screen inbound contacts, confirm match criteria, and log results.
00:00
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.
Name
Work email
Phone Number
Harmony.ai vs Retell AI
 |  | |
|---|---|---|
| Platform | ||
| Built for | Revenue teams: AI receptionist, AI SDR, scheduling | General-purpose voice agents for phone, web, SMS |
| 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 | Choice of seven TTS providers; platform voices fine-tuned for phone; LLM is bring-your-own |
| Implementation | White-glove | Self-serve |
| Calling & scale | ||
| Latency | Sub-400ms median response | ~600ms latency (published) |
| Concurrency | 1 to 10,000 parallel calls | 20 concurrent by default on pay-as-you-go; burst surcharge |
| Telephony | Built-in telephony or bring your own trunks; buy, assign and retire numbers across regions from one inventory; port or forward | Buy Retell-managed US and Canada numbers in the dashboard, or bring your own over SIP trunking |
| Spam remediation | Number-reputation monitoring, automatic quarantine of flagged numbers, remediation, branded caller ID and local presence | Verified phone number registration and branded call, US only, as paid add-ons |
| 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 | Press Digit tool for outbound IVR menus, IVR and voicemail detection, inbound DTMF capture; 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 with custom charts; post-call analysis with custom extracted fields |
| Self-improvement | Reasoning trace on every call, simulate changes on past calls, agent proposes knowledge-base updates you approve | Manual: review post-call analysis, edit the prompt, re-test |
| Experimentation | A/B live or synthetic traffic, publish the winner, roll back; agent keeps what converts across a campaign | A/B test by splitting live traffic between agents or prompts; simulation test cases |
| Pricing & compliance | ||
| Pricing | Plans start at $3K/month | Pay-as-you-go, $0.07–$0.31/min plus add-ons; enterprise custom |
| Compliance | SOC 2 Type II, HIPAA, GDPR, ISO 27001 | HIPAA, SOC 2 Type 1 and 2, GDPR, ISO 27001 |
Retell AI figures from retellai.com, retellai.com/pricing and docs.retellai.com, checked 8 Sep 2026. Retell AI is a trademark of its owner. Harmony.ai is not affiliated with Retell AI.
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.
