Categories · Realtime Voice Agent APIs
Retell AI vs Ultravox
Retell AI and Ultravox are both Realtime Voice Agent APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. Ultravox starts lower at $0.05 per minute vs $0.06 for Retell AI. On compliance, Retell AI additionally documents SOC 2, HIPAA, GDPR. For coding-agent use, Retell AI scores higher on agent-friendliness (65 vs 20).
Comparedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.
Data last verified 2026-06-21, with every field cited on each profile.
Head-to-head, from published, cited fields (auto-generated; no paid placement)| Field | Retell AI | Ultravox |
|---|
| Starting price | $0.06 minute | $0.05 minute |
|---|
| Pricing model | Usage | Usage |
|---|
| Free tier | ✗ | ✗ |
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| Self-serve signup | ✓ | ✓ |
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| SOC 2 | Type II | · |
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| HIPAA | ✓ | · |
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| GDPR | ✓ | · |
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| Webhooks | ✓ | ✓ |
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| Sandbox | ✗ | ✗ |
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| Documented actions | 29 | 20 |
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Full data and citations: Retell AI · Ultravox. See more Realtime Voice Agent APIs.