AI Tools · AI Voice Agents

Retell AI

Platform for building, testing and running AI voice agents that answer and make phone calls, billed per minute.

Our take: Retell AI gives teams a drag-and-drop flow builder, call transfer, appointment booking, a knowledge base, batch calling, simulation testing and post-call analysis for AI phone agents, plus chat and SMS agents.

Best forAI phone agents

ReviewedOct 2026Paid

7.05 criteria · see breakdown

Try Retell$10 free credits; $0.07-$0.31/min

Retell AI is a platform for building, testing and deploying AI voice agents that answer and make phone calls, for uses such as receptionists, appointment booking, lead qualification and customer service. It is aimed at businesses and developers automating call volume. Pricing is pay as you go at $0.07 to $0.31 per minute for voice agents, and new accounts get $10 in free credits.

The bottom line

The go-to API platform for developers shipping production-grade AI voice agents at scale.

Our score

Reviewed by the Conversion Gems editorial team. Hover a facet to focus it; click to pin.Tap a facet to focus it.

Community ratings

Shown for context only. Our score is independent.

4.8

2,400+ reviews

Trustpilot

4.9

810+ reviews

4.8 / 5 aggregate · across 2 sources

Third-party ratings shown verbatim; aggregate weighted by review volume.

What it is, and why we rate it

One line each. Open a row for detail.

What it really isRetell AI — API platform for building and deploying AI phone agents.

Our takeRetell AI gives teams a drag-and-drop flow builder, call transfer, appointment booking, a knowledge base, batch calling, simulation testing and post-call analysis for AI phone agents, plus chat and SMS agents.

The per-minute price is the sum of its voice engine, the LLM you choose, the text-to-speech voice and telephony, so the model and voice you pick set your cost.

Why we rate itRetell AI stands out for giving developers full platform access without feature gating on the free tier, and for supporting multiple LLM backends so teams can balance cost and quality per use-case.

The catchThe lowest listed rate rarely reflects a full call: LLM, voice, telephony and add-ons are billed on top of the $0.055 voice engine rate, so model and voice choices change the bill.

Best / not good for

Best for

Developer teams building AI phone agents for support or sales
Startups needing pay-as-you-go telephony AI without upfront commitment
Enterprises requiring compliant, high-concurrency voice AI infrastructure

Not good for

Teams that need a fixed monthly price for call volume
Anyone looking for AI narration or storytelling (it is a phone agent platform)
Very high call volumes on a tight per-minute budget

Trade-offs

Friction report

Trade-offs to know before signing up.

Time to value
Moderate: API keys and $10 credits are instant, but meaningful agent deployment requires LLM setup, telephony configuration, and testing cycles — expect hours to days.
Scale breakpoint
Concurrent call limits (20 free) and per-minute cost stacking become significant pain points beyond a few hundred monthly call-hours.
Walled garden
Low: standard REST API, webhook-based data export, and support for third-party LLMs and TTS providers keep lock-in minimal.

Still a fit?

If none of these block you, try it on the official site.

Try Retell

Retell AI pricing

Item	Price
AI voice agents (pay as you go)	$0.07 to $0.31 per minute
AI chat agents	From $0.002 per message
Retell voice infrastructure	$0.055 per minute
Text-to-speech	$0.015 per minute (ElevenLabs voices $0.040)
US telephony (Twilio)	$0.015 per minute; no charge for your own SIP
Retell phone number	$2.00 per month
Concurrent calls	20 free, then $8.00 per call per month
Enterprise	Custom pricing

From Retell AI's pricing page, checked 3 October 2026. LLM charges are added per minute and vary by model. New accounts get $10 in free credits.

A look inside

Frequently Asked Questions

What is Retell AI?

Retell AI is a platform for building and running AI voice agents that answer and make phone calls, with tools for testing, deployment and call analysis.

How much does Retell AI cost?

Voice agents cost $0.07 to $0.31 per minute on pay as you go, depending on the LLM, voice and telephony you use. Enterprise pricing is custom (checked 3 October 2026).

Is Retell AI free?

There is no free plan, but new accounts get $10 in free credits with full platform access and no commitment.

How many calls can a Retell agent handle at once?

Pay-as-you-go accounts include 20 concurrent calls; more cost $8.00 per concurrent call per month.

Retell AI alternatives

Other AI voice agent platforms from our reviews:

Showing 1–3 of 4

Sources checked October 3, 2026: Retell AI pricing, Retell AI homepage.

Conversion Gems independently reviews every tool.