# PolyAI vs Retell AI: who uses which

On usedby, 18 companies use PolyAI and 32 use Retell AI. No company is listed with both yet. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side. Latest check 2026-10-08: 50 of 50 public lines checked.

## Side by side

|  | [PolyAI](https://www.usedby.ai/tools/polyai.md) | [Retell AI](https://www.usedby.ai/tools/retell-ai.md) |
|---|---|---|
| Public customers | 18 | 32 |
| Confirmed | 14 | 14 |
| Observed | 4 | 18 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | Banking & Mortgages (1), Energy, Utilities & Cleantech (1), IT Services & System Integration (1) | EdTech & E-learning (2), Consumer Goods (1), Fintech & Payments (1) |
| Category | AI Phone Agents | AI Phone Agents |
| Security | ISO 27001 ([poly.ai](https://poly.ai/security), checked 2026-10-08) | — |
| Data processing terms | A data processing agreement is available. ([poly.ai](https://poly.ai/dpa), checked 2026-10-08) | A data processing agreement is available. ([trust.retellai.com](https://trust.retellai.com/), checked 2026-10-07) |
| Integrations | Salesforce, Zendesk, NICE CXone, Amazon Connect, Genesys, Webex, Five9 ([docs.poly.ai](https://docs.poly.ai/integrations/introduction), checked 2026-10-08) | Twilio, n8n, Go High Level, Cal.com, Vonage, HubSpot, Zapier, Zoho CRM, Google Workspace, Make, Salesforce, Calendly ([retellai.com](https://www.retellai.com/integrations), checked 2026-10-07) |
| Free trial | — | Free trial or free plan available. ([retellai.com](https://www.retellai.com/pricing), checked 2026-10-07) |

## Published results

Reviewed stories only; usedby did not measure the figures.

- PolyAI: [Simplyhealth](https://www.usedby.ai/case-studies/simplyhealth-polyai.md): **5,500 calls**: “The PolyAI voice assistant is now handling an average of 5,500 calls each week on Simplyhealth’s consumer line.” (published 2023-09-17)
- PolyAI: [Atos](https://www.usedby.ai/case-studies/atos-polyai.md): **50%**: “at 50% of the cost of an FTE” (published 2023-10-28)
- Retell AI: [Matic](https://www.usedby.ai/case-studies/matic-retell-ai.md): **~3 minutes**: “Call handling time reduction in data intake flows: ~3 minutes” (captured by usedby 2026-10-05)
- Retell AI: [TripleTen](https://www.usedby.ai/case-studies/tripleten-retell-ai.md): **200 hours**: “That’s roughly 200 hours per month we’re getting back” (captured by usedby 2026-10-05)

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Source: https://www.usedby.ai/compare/polyai-vs-retell-ai · How we check: https://www.usedby.ai/methodology