# Retell AI vs Synthflow: who uses which

On usedby, 32 companies use Retell AI and 14 use Synthflow. 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 2026-10-05: 43 of 46 public lines checked.

## Side by side

|  | [Retell AI](https://www.usedby.ai/tools/retell-ai.md) | [Synthflow](https://www.usedby.ai/tools/synthflow.md) |
|---|---|---|
| Public customers | 32 | 14 |
| Confirmed | 14 | 7 |
| Observed | 18 | 7 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | EdTech & E-learning (2), Consumer Goods (1), Fintech & Payments (1) | Investment & VC (2), Marketing Tech (1), Sales Tech & CRM (1) |
| Category | AI Phone Agents | AI Phone Agents |
| Data processing terms | A data processing agreement is available. ([trust.retellai.com](https://trust.retellai.com/), checked 2026-10-07) | A data processing agreement is available. ([security.synthflow.ai](https://security.synthflow.ai/), 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) | — |

## Published results

Reviewed stories only; usedby did not measure the figures.

- 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)
- Synthflow: [Smartcat](https://www.usedby.ai/case-studies/smartcat-synthflow.md): **70%**: “reducing booking costs by 70%” (captured by usedby 2026-10-05)
- Synthflow: [Peak Demand](https://www.usedby.ai/case-studies/peak-demand-synthflow.md): **+80%**: “+80% Faster Data Submission” (captured by usedby 2026-10-05)

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