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Harmony.ai vs Retell AI: managed voice AI, not a toolkit.

Harmony.ai vs Retell AI: managed voice AI, not a toolkit.

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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Hear sample calls

Cream rotary desk telephone with a wine-colored dial and cord, seen through vertical fluted glass

Receive a live call from our agent

Name

Work email

Phone Number

Cream rotary desk telephone with a wine-colored dial and cord, seen through vertical fluted glass

Receive a live call from our agent

Name

Work email

Phone Number

Harmony.ai vs Retell AI

CriteriaHarmony.ai logoRetell AI logo
Built forRevenue teams: AI receptionist, AI SDR, schedulingGeneral-purpose voice agents for phone, web, SMS
ModelOur own models, built for the phoneChoice of third-party LLM and TTS providers
PricingPlans start at $3K/monthPay-as-you-go, $0.07–$0.31/min plus add-ons; enterprise custom
ImplementationWhite-gloveSelf-serve
LatencySub-400ms median response~600ms latency (published)
Concurrency1 to 10,000 parallel calls20 concurrent by default on pay-as-you-go; burst surcharge
ComplianceSOC 2 Type II, HIPAA, GDPR, ISO 27001HIPAA, 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 for yourself.

Three scenarios. One AI agent under pressure.

The interruption test
The caller changes their mind mid-sentence. The agent keeps up, no reset.
0:00
The edge case
An off-script question gets a controlled answer, then straight back to the flow.
0:00
The handoff
When it's genuinely human territory, the agent transfers warm, with a summary.
0:00

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.

Talk to a Voice AI expert

What should your agents automate?

Step
0104
Pick all that apply.

Why teams choose Harmony.ai over a toolkit

Why teams choose Harmony.ai over a toolkit

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.

Two colleagues at a shared desk, one taking a customer call

Natural interruptions, tone, and timing. Your prospects won't be talking to a robot.

Purpose-built for revenue teams - qualification, booking, follow-ups. Not a generic voice platform bent into shape.

Sub-second responses, grounded in your data. No hallucinations, no awkward pauses.

You decide what your agent says, when it escalates, and where the guardrails are. Test every change before it ships.

Colleague on a customer call at a shared desk

Natural interruptions, tone, and timing. Your prospects won't be talking to a robot.

Purpose-built for revenue teams - qualification, booking, follow-ups. Not a generic voice platform bent into shape.

Sub-second responses, grounded in your data. No hallucinations, no awkward pauses.

You decide what your agent says, when it escalates, and where the guardrails are. Test every change before it ships.

Meet Siena, your AI assistant

Siena agent builder screen asking what the agent should doVisual editing canvas for building the call flowProactive insights screen with smart suggestionsSelf improving view showing suggested fixesAI generated reports screen with booking rate

Enterprise-grade security

Enterprise-grade AI infrastructure with built-in protection and security, data privacy, governance, permissions, and compliance.

SOC Type 2

We meet SOC 2 requirements to ensure secure and compliant management of data across all our systems.

GDPR

With our technical team based in Sweden, we operate under GDPR - the world's strictest standard for data privacy.

HIPAA

We safeguard your protected health information with HIPAA-compliant processes, policies, and technical controls.

ISO 27001

Harmony.ai is fully certified with ISO 27001, the internationally recognized standard for information security management.

SOC Type 2

We meet SOC 2 requirements to ensure secure and compliant management of data across all our systems.

GDPR

With our technical team based in Sweden, we operate under GDPR - the world's strictest standard for data privacy.

HIPAA

We safeguard your protected health information with HIPAA-compliant processes, policies, and technical controls.

ISO 27001

Harmony.ai is fully certified with ISO 27001, the internationally recognized standard for information security management.

Frequently asked questions

Plans start at $3K/month. Pricing depends on call volume and use case. Built for teams handling 500+ calls a month.

Most teams are live in days. Implementation is white-glove and included.

Yes. AI receptionist, AI SDR and appointment scheduling run on one platform.

SOC 2 Type II, HIPAA, GDPR and ISO 27001. PII redaction on transcripts, TCPA and DNC aware calling.

It dials, qualifies against your approved criteria, and books meetings straight into your CRM. Your reps take the meeting.