# Regal vs Retell AI: who uses which

On usedby, 40 companies use Regal and 32 use Retell AI. 1 company uses both, including Varsity Tutors. 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: 72 of 72 public lines checked.

## Side by side

|  | [Regal](https://www.usedby.ai/tools/regal.md) | [Retell AI](https://www.usedby.ai/tools/retell-ai.md) |
|---|---|---|
| Public customers | 40 | 32 |
| Confirmed | 26 | 14 |
| Observed | 14 | 18 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | EdTech & E-learning (4), Fintech & Payments (3), Insurance & InsurTech (2) | EdTech & E-learning (2), Consumer Goods (1), Fintech & Payments (1) |
| Category | AI Phone Agents | AI Phone Agents |
| Data processing terms | A data processing agreement is available. ([regal.ai](https://www.regal.ai/security), checked 2026-10-08) | A data processing agreement is available. ([trust.retellai.com](https://trust.retellai.com/), checked 2026-10-07) |
| Free trial | — | Free trial or free plan available. ([retellai.com](https://www.retellai.com/pricing), checked 2026-10-07) |
| Integrations | — | 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) |

## Companies named on both

Confirmed or observed on each side.

| Company |
|---|
| [Varsity Tutors](https://www.usedby.ai/companies/varsity-tutors.md) |

## Published results

Reviewed stories only; usedby did not measure the figures.

- Regal: [Healthbird](https://www.usedby.ai/case-studies/healthbird-regal.md): **250%**: “HealthBird instantly saw a 250% lift in agent productivity from using their Sales Dialer.” (captured by usedby 2026-10-08)
- Regal: [Career Karma](https://www.usedby.ai/case-studies/career-karma-regal.md): **2x**: “2x Lift in Conversions” (captured by usedby 2026-10-08)
- 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/regal-vs-retell-ai · How we check: https://www.usedby.ai/methodology