# Retell AI (Retell AI)

Category: Voice AI agents. Public reviews about the AI: 24. Profile updated 2026-10-08.

Self-serve platform for building AI voice agents that answer and place phone calls, priced per minute.

## What it does

Retell AI is a platform for building, testing and deploying AI agents that handle inbound and outbound phone calls [1]. The same agents can run in web and in-app chat and over SMS [1]. Agents can pull CRM context during a call and write outcomes back [1]. Customers choose the language model and voice, and each is priced per minute [2].

Channels: Voice, Chat, SMS. Works with: Contact center platforms Genesys Cloud, Five9, Amazon Connect and Avaya Aura [3]; SIP trunking for existing phone numbers, plus connectors for CRMs, knowledge bases and calendars [1].

## Handoff

Cold transfer drops the agent and sends the call straight to the destination; warm transfer keeps the agent on the line to speak a private whisper message to the person before connecting [4]. An agentic warm transfer uses a second AI that gets the full conversation, briefs the person and then connects or cancels the transfer [4]. Custom SIP headers can carry data to the destination's systems when transferring to a SIP endpoint [4]. Staff can also listen to live calls and take over [1].

## Controls

- Output guardrails replace responses on 9 prohibited topics, including regulated legal, medical and financial advice; an input guardrail catches jailbreak attempts [5].
- Versions start as drafts; published versions are read-only, and phone numbers can follow a prod or staging tag that can be moved back to an earlier version [6].
- Simulation tests grade scenarios pass or fail against success criteria, run as a batch after every change, and can be drafted from real calls [7].
- Data retention settings and an option to stop storing sensitive call data [3].
- PII removal and safety guardrails are paid add-ons per minute [2].
- SSO and role-based access; enterprise plans include a BAA for HIPAA [2].

## Setup

Self-serve sign-up with $10 in free credits [2]. Retell says you can deploy an agent in minutes [1].

## Billing

Per minute. Pay as you go at $0.07 to $0.31 a minute, the sum of voice infrastructure ($0.055), the chosen LLM, the voice and telephony (typically $0.015), plus add-ons; chat is from $0.002 a message; 20 concurrent calls included, then $8 per extra concurrent call a month; enterprise pricing is custom [2]. What counts: Calls are billed to the nearest second, including silence and hold time; failed calls are not billed, and after a transfer only telephony fees continue [2].

## Vendor claims (not results)

- Retell says its agents respond with about 600 ms of latency [1].
- Retell cites a Cekura benchmark in which it reached 95.7% workflow accuracy across 414 calls, the highest of six platforms [1].
- Retell says SWTCH cut support costs by over 50% and Medical Data Systems handles 100% of inbound calls with a 30% transfer rate [1].
- Retell says it complies with HIPAA, SOC 2 Type II, GDPR and ISO 27001 [1].

## Not found in public sources

- A published resolution or containment definition
- A built-in topic list the customer can define beyond the fixed guardrail categories

## What reviewers say

- Does the job: 73% positive (8 of 11; 95% interval 43%–90%)
- Accuracy: 1 positive, 0 negative (too few to rate)
- Handoff to a person: 0 positive, 0 negative (too few to rate)
- Cost: 3 positive, 0 negative (too few to rate)
- Setup and upkeep: 6 positive, 0 negative (too few to rate)

> "I have an issue with retell Ai batch calling not making outbound calls but no one here to help." (M S., Trustpilot, 2026-07-08: https://www.trustpilot.com/reviews/6a4e9f0a01736e89de868fe5)
> "This software is so good i have been using it for my latest project and couldn't recommend them any more." (Luke S., Trustpilot, 2026-06-18: https://www.trustpilot.com/reviews/6a34102f2a01ba99d8036b3d)
> "Been using the product for over a year, really love it!" (Li, Trustpilot, 2026-05-14: https://www.trustpilot.com/reviews/6a050c17618d264a24f6c538)
> "the latency of the model didnt support fast paced conversations." (David H., Trustpilot, 2026-03-24: https://www.trustpilot.com/reviews/69c2d9879c7a7f4a1b746941)
> "Highly advanced AI calling software for retail, though with slight latency." (Rhea A., Trustpilot, 2026-03-24: https://www.trustpilot.com/reviews/69c2d2f831f779801476ceb2)
> "I've been trying to make outbound calls to Turkey (+90) for days and every single call fails immediately" (Abdulselam A., Trustpilot, 2026-03-11: https://www.trustpilot.com/reviews/69b164e8be14c188ebe95622)
> "Very cheap and a good control over everything" (Marcos V., Trustpilot, 2026-02-10: https://www.trustpilot.com/reviews/698b81859cce14c87d226332)
> "I build a lot of ai voice agents for busineses and I found that it works well for all of them." (Ritik K., Trustpilot, 2026-02-10: https://www.trustpilot.com/reviews/698aa7530368c2e10de68f3f)
> "Overall, it’s a solid platform with strong potential that keeps getting better over time." (Anatoli, Trustpilot, 2026-02-10: https://www.trustpilot.com/reviews/698a8a00e79c0dfc7d5763b4)
> "With Retell AI it was 10 minutes to have an active bot doing exactly what I needed." (Jake B., Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/698a46d61b93baa0a27425e7)
> "In my opinion, Retell has the best user experience and proven stability." (Christian L., Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/698a40a71e81ee268ea2cee9)
> "What really sets Retell apart is how well it handles real conversation" (Trustpilot reviewer, Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/698a39b1eeeebc3a38f1f008)
> "Probably the best AI caller I've used. Simple and advanced at the same time. highly recommend" (G K, Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/698a25a730e16a027ead06fd)
> "super easy to use, detailed docs and very simple node style call flow editing. A++!" (Steve S., Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/69898a07e1516a5fde305e66)
> "No convoluted reseller models, no price inflation, no unnecessary middleware - just a platform that works seamlessly." (Vic, Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/6989195217a34cab550a76f4)
> "The service is relatively easy to use, and does exactly what it promises. Very happy." (Kurt, Trustpilot, 2026-02-09: https://www.trustpilot.com/reviews/6989145441fd4e13d245fbf3)
> "Something that I loved in Retell is its human like voice and low latency." (Pradhyun, Trustpilot, 2026-02-08: https://www.trustpilot.com/reviews/6987ebdf05ad39e8dc32c2bc)
> "This app has completely automated our initial client touchpoints and phone inquiries" (Visual Branding, Trustpilot, 2026-02-07: https://www.trustpilot.com/reviews/69879a89803302d98791fc42)
> "I like the cost as it is very cost effective and I plan on using this platform for a host of things." (Rasheem G., Trustpilot, 2026-02-07: https://www.trustpilot.com/reviews/698776c8a770737a25276c0d)
> "all the tools and ways I'm able to configure an agent so well it's indistinguishable from a person." (Elijah W., Trustpilot, 2026-02-07: https://www.trustpilot.com/reviews/6986cda3f45c2c13c859894d)
> "The voice detection, accuracy, and efficiency are much better than those of other platforms." (Mohsin I., Trustpilot, 2026-02-06: https://www.trustpilot.com/reviews/6985cf48e86e94bfda60f035)
> "Improvements could be made to the range of UK English voices available as most of the voices are American" (Denis D., Trustpilot, 2026-02-05: https://www.trustpilot.com/reviews/6984cd8ac0978070e07a1e7f)
> "Retell has helped me so much with my company. I dont need 3 people handling phone calls anymore!" (Alan, Trustpilot, 2026-02-05: https://www.trustpilot.com/reviews/6984277fdc6eb58ad99a661d)
> "extremely natural Human like voice AI. The interface is easy and self-guiding which makes setup easy." (Maestro Growth, Trustpilot, 2026-02-04: https://www.trustpilot.com/reviews/6983874772ddb2fe7076c68e)

## Sources

1. [Retell AI home page](https://www.retellai.com/), Retell AI, accessed 2026-10-08
2. [Pricing](https://www.retellai.com/pricing), Retell AI, accessed 2026-10-08
3. [Documentation index](https://docs.retellai.com/llms.txt), Retell AI, accessed 2026-10-08
4. [Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call), Retell AI, accessed 2026-10-08
5. [Guardrails](https://docs.retellai.com/build/guardrails), Retell AI, accessed 2026-10-08
6. [Agent versioning](https://docs.retellai.com/agent/version), Retell AI, accessed 2026-10-08
7. [Testing overview](https://docs.retellai.com/test/test-overview), Retell AI, accessed 2026-10-08

Canonical page: https://get-support-ai.com/products/retell-ai