Millis AI vs Retell AI

Comprehensive side-by-side comparison — features, pricing, performance, and more.

Data last refreshed October 2026

Millis AI

TMate Inc.

Build next-gen voice agents with ultra-low 600ms latency

Paid

71% verification coverage

Retell AI

Retell AI Inc.

AI voice agent platform for phone call centers

Paid

82% verification coverage

Trust & Reliability

Millis AI

Customers (per vendor):Evergrowth, Annie, GPT Nexus +4

GDPR

Retell AI

Uptime:99.97% (30-day)Status page

Users:1K-10K

Customers (per vendor):Pine Park Health, SWTCH, Medical Data Systems +5

GDPR

SOC 2

HIPAA

Overall Winner: Retell AI

8.1/10 vs Millis AI at 5.9/10

Leads in:

Integration

Support

Customization

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

AI Comparison Summary

Millis AI

5.9

avg score

Retell AI

8.1

avg score

Retell AI leads overall — particularly in Customization and Support and 3 more.

Based on 7 dimensions

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Overall Winner

Retell AI

8.1 / 10

Millis AI

Best For

Developers building voice applications

Businesses automating customer support

Teams creating virtual assistants

Innovators developing voice-enabled devices

Retell AI

Best For

Call centers automating high-volume customer interactions

Healthcare providers streamlining patient scheduling and inquiries

Financial services firms enhancing customer support and lead qualification

Logistics companies managing dispatch services and customer communication

* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology

Millis AI is best for

🎵Audio & Voice7.0✍️Writing & Content6.0🎨Image & Design6.0

Retell AI is best for

🎵Audio & Voice8.3🎧Customer Support7.7✍️Writing & Content7.5

Filter by your use case:

Limitations

Millis AI

Cons

No cons listed yet.

Retell AI

Cons

No cons listed yet.

Weighted Score — Adjust What Matters to You

Pick a profile or drag sliders — scores and radar update instantly on the right.

Quick profiles:

Ease of Use5

Customization5

Support5

Integration5

Compliance & Data Protection5

Performance5

Planning Quality5

Dimension Comparison

Millis AI

5.9

/ 10

Retell AI

8.1

/ 10

Clear winner

Dimension Breakdown

Ease of Use

How intuitive is onboarding, UI navigation, and day-to-day usage for the target audience?

Millis AI

9.0▲ +1.0

Retell AI

8.0

Customization

Calculated

How much can users tailor workflows, settings, prompts, or outputs to their needs?

Millis AI

6.0

Retell AI

8.0▲ +2.0

Support

How strong is the documentation, customer support, community, and learning resources?

Millis AI

5.0

Retell AI

9.0▲ +4.0

Integration

Calculated

How well does it connect with other tools, APIs, and workflows?

Millis AI

6.0

Retell AI

10.0▲ +4.0

Compliance & Data Protection

Calculated

Compliance certifications and data-protection posture, counted from ten verified signals: SOC 2 Type II, GDPR compliance, HIPAA, WCAG AA/AAA, PII redaction, licensed-only training, a published sub-processor list, a downloadable DPA, not training on user data, and a documented deletion path

Millis AI

3.0

Retell AI

8.0▲ +5.0

Performance

Calculated

Latency + throughput speed

Millis AI

8.0

Retell AI

8.0

Planning Quality

Calculated

Multi-step planning depth + replanning capability

Millis AI

4.0

Retell AI

6.0▲ +2.0

Calculated = derived from structured signals (integration count, API/open-source config, compliance certs, response-time). AI = LLM-assessed from public website content. Methodology

Task Performance

Millis AI

Task

Retell AI

8.0

Latency Ttft

8.0

6.0

Speech Recognition Accuracy

8.0

Voice Naturalness

8.0

Interruption Handling

8.0

7.0

Turn Taking

8.0

6.0

Context Retention

8.0

7.0

Multilingual Support

9.0

2.0

Emotion Detection

5.0

6.0

Call Routing Transfer

9.0

4.0

Crm Integration

8.0

1.0

Ticket Management

6.0

Auto Resolution

8.0

* Task scores (1–10) are algorithmically generated from publicly available data.

Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy

Frequently Asked Questions

What are the main differences between Millis AI and Retell AI?

Millis AI — "Build next-gen voice agents with ultra-low 600ms latency". Retell AI — "AI voice agent platform for phone call centers". The Features section on this page compares them side by side.

Who is Millis AI best for compared with Retell AI?

Millis AI is best for Developers building voice applications; and for Businesses automating customer support. Retell AI is best for Call centers automating high-volume customer interactions; and for Healthcare providers streamlining patient scheduling and inquiries.

How does the pricing of Millis AI compare with Retell AI?

Millis AI is paid. Retell AI is paid. Always verify current pricing with the vendor.

Does Millis AI or Retell AI have a free plan?

Millis AI lists no free plan. Retell AI lists no free plan. Always verify current pricing with the vendor.

Do Millis AI and Retell AI offer an API?

Millis AI offers a public API. Retell AI offers a public API.

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