Retell AI
Self-serve platform for building AI voice agents that answer and place phone calls, priced per minute. By Retell AI.
73% of reviewers who mention it are positive on “handles calls on its own” (8 of 11; 95% interval 43%–90%).
What reviewers say
24 public reviews about the AI, from Trustpilot. Each share counts the reviews that mention the point.
Read with care. Most of this product's recent reviews were invited in one campaign in February 2026 and are short five-star praise. The positive shares are likely inflated; the complaints all come from unprompted reviews.
Does the job
73%43%–90%8 of 11
Accuracy
1 of 1too few to rateHandoff to a person
–too few to rateCost
3 of 3too few to rateSetup and upkeep
6 of 6too few to ratePraise
“Very cheap and a good control over everything”
“I build a lot of ai voice agents for busineses and I found that it works well for all of them.”
“With Retell AI it was 10 minutes to have an active bot doing exactly what I needed.”
“In my opinion, Retell has the best user experience and proven stability.”
“What really sets Retell apart is how well it handles real conversation”
“Probably the best AI caller I've used. Simple and advanced at the same time. highly recommend”
Complaints
“I have an issue with retell Ai batch calling not making outbound calls but no one here to help.”
“the latency of the model didnt support fast paced conversations.”
“I've been trying to make outbound calls to Turkey (+90) for days and every single call fails immediately”
What it does
Retell AI is a platform for building, testing and deploying AI agents that handle inbound and outbound phone calls1. The same agents can run in web and in-app chat and over SMS1. Agents can pull CRM context during a call and write outcomes back1. Customers choose the language model and voice, and each is priced per minute2.
- Channels
- Voice, Chat, SMS
Handing a conversation to a person
As Retell AI documents it. Reviewers' experience of handoffs is in the shares above.
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 connecting4. An agentic warm transfer uses a second AI that gets the full conversation, briefs the person and then connects or cancels the transfer4. Custom SIP headers can carry data to the destination's systems when transferring to a SIP endpoint4. Staff can also listen to live calls and take over1.
Controls
Safety and review features, as Retell AI documents them.
- Output guardrails replace responses on 9 prohibited topics, including regulated legal, medical and financial advice; an input guardrail catches jailbreak attempts5.
- 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 version6.
- Simulation tests grade scenarios pass or fail against success criteria, run as a batch after every change, and can be drafted from real calls7.
- Data retention settings and an option to stop storing sensitive call data3.
- PII removal and safety guardrails are paid add-ons per minute2.
- SSO and role-based access; enterprise plans include a BAA for HIPAA2.
What Retell AI claims
The vendor's own figures. Shown as claims; never used in a result.
- Retell says its agents respond with about 600 ms of latency1.
- Retell cites a Cekura benchmark in which it reached 95.7% workflow accuracy across 414 calls, the highest of six platforms1.
- Retell says SWTCH cut support costs by over 50% and Medical Data Systems handles 100% of inbound calls with a 30% transfer rate1.
- Retell says it complies with HIPAA, SOC 2 Type II, GDPR and ISO 270011.
Not found in public sources
We looked for these and could not find them.
- A published resolution or containment definition
- A built-in topic list the customer can define beyond the fixed guardrail categories
Sources
Billing
Per minutePay 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 custom2.
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 continue2.
The headline rate may leave out the model, speech and phone-line costs.
Reviews found
- About the AI
- 24
- Sources
- 1
- Collected
- Oct 8, 2026
Where we looked
- Trustpilot retellai.com: pages 1-4 read (80 of 810 reviews); 24 qualifying. 74 of the 80 are labelled Invited and posted Feb 3-10, 2026 in one burst; most are too short or carry no opinion
- Reddit: blocked (search and fetch both refused)
- Hacker News comments since 2024-10: mentions only, no user opinions
- TrustRadius: 0 reviews
- Capterra: 403 (G2 also 403 on other products)
Also in Voice
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