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Retell AI
Developer platform for building, testing, and monitoring AI phone agents with published per-minute economics and production QA tooling.
Product and platform teams that want to ship inbound or outbound voice agents with control over models, voices, and telephony without a managed contact-center program.
Contact centers that want a fully managed enterprise voice outsourcer with white-glove conversation design and no in-house builders.
Co-founded by Bing Wu.
Verdict
Retell AI is a good fit when your voice agent is a product you will keep shipping, not a black-box contact-center outsourcing deal. Public commercial packaging is unusually clear for this category, with pay-as-you-go minutes and an enterprise path when concurrency and compliance tighten. Practitioners like latency and monitoring; teams that want vendor-led conversation design with no builders on staff may still prefer PolyAI-class peers.
Score Breakdown
How Retell AI scores in the categories that matter to its buyers.
Pricing
Retell AI publishes pay-as-you-go voice pricing on retellai.com/pricing. Figures below are USD list signals as of September 2026; fully loaded minutes depend on LLM, TTS, and telephony choices, and Enterprise remains quote-led.
| Plan / SKU | Meter | Price (USD) | What stands out |
|---|---|---|---|
| Pay as you go | per minute | About $0.07–$0.31 | Platform + model/voice mix; no annual minimum |
| Typical fully loaded call | per minute | About $0.11–$0.31 | Depends on LLM/TTS/telephony stack |
| Concurrency beyond 20 | per concurrent / month | $8 | First 20 concurrent calls included |
| Enterprise | annual | Custom quote | SSO, HIPAA path, dedicated support |
The Field at a Glance
How Retell AI compares with other AI voice agents vendors we reviewed, by Overall Score and relative typical engagement cost.
Retell AI scores 8.3 in AI voice agents, ahead of PolyAI (7.8), Vapi (7.7), and Synthflow (7.6). Relative cost lands lower for this subcategory.
Compared with …
- Retell AI vs PolyAI 8.3/7.8
- Retell AI vs Vapi 8.3/7.7
Use-case matrix
| Use case | Fit | Notes |
|---|---|---|
| Custom voice agent development | Strong | Retell's core product. |
| Telephony orchestration & monitoring | Strong | Built into the platform. |
| Published usage economics | Strong | Per-minute rates are published. |
| Fully managed contact-center CX | Mixed | PolyAI offers more managed service. |
| Plain STT/TTS API only | Weak | Deepgram and ElevenLabs cover this. |
| Document IDP extraction | Poor | A document-extraction vendor covers this. |
Review Excerpts
Excerpts from public reviews and forum discussions of Retell AI, plus representative buyer views drawn from public information. Paid reviews and pay-for-play sites were excluded.
“I was skeptical but the demo is incredible ( https://beta.retellai.com/home-agent )”
“We got an inbound agent running quickly because telephony and simulation testing were already built into the platform.”
Representative buyer view
“The platform fee was only the start. The language model and voice we picked changed the fully loaded per-minute cost.”
Representative buyer view
“We prototype agents on Retell, keep prompts in git, run simulation suites before launch, and keep human escalation in the existing call center.”
Representative buyer view
Where customer reviews couldn't be found, our analysts attempted to give a voice to buyer sentiment, drawing on real information from review sites, forums, and product documentation.
Based on: Retell AI's website and Retell AI's pricing page
Company Facts
- Founded
- 2023 (CB Insights)
- Headquarters
- Redwood City, California, United States (CB Insights)
- Employees
- About 50 (Y Combinator)
- Total funding raised
- $5.1M (CB Insights)
- Key investors
- Y Combinator, Aaron Levie, Michael Seibel, Rajat Suri, Carya Venture Partners (CB Insights)
- Accelerator
- Y Combinator, Winter 2024 batch (Y Combinator)
- Customers
- Lenovo and Asbury Auto (CB Insights)
- Website
- retellai.com
Key Leadership
Bing Wu
Co-founder and CEO
Methodology
This page is an independent evaluation of Retell AI for buyers comparing options in AI voice agents. AI Industry Reviews accepts no sponsorships, advertising, or pay-for-placement fees. Retell AI did not pay for this review.
What we scored
The headline number is an Overall Score on a 0-10 scale. Eight criteria sit under it in two groups.
- Buyer outcomes (for AI voice agents)
- Voice quality & latency
- Developer orchestration & APIs
- Production monitoring / QA
- Managed contact-center services
- Company & commercial
- Innovation & product leadership
- Project management & communication
- Pricing
- Contract fairness
Pricing measures whether the price looks fair for the value delivered, including packaging and renewal friction that show up in real buying cycles.
Score Composition
| Input | Weight | What it covers |
|---|---|---|
| Reviews | 40% | A proprietary read of what practitioners say about likes, complaints, and day-to-day use, including public review sites, forums, and private chat rooms. Paid reviews and pay-for-play sites are out of scope. |
| Product | 35% | Hands-on look at screens and workflows. |
| Pricing | 15% | Whether the price looks fair for what you get. |
| Docs & training | 10% | Docs, tutorials, and training material. |
How we balanced the evidence
The Overall Score is the simple average of the eight criteria. Recommendation language follows that score and the use-case matrix above.
Scope
Retell AI is graded here as AI voice agents. Criteria scores can move as more review volume and product checks are added.