Categories · Realtime Voice Agent APIs
Ultravox vs Vapi
Ultravox and Vapi are both Realtime Voice Agent APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. Vapi offers a free tier while Ultravox does not, so Vapi is easier to trial before committing. On compliance, Vapi additionally documents SOC 2, HIPAA, GDPR. For coding-agent use, Vapi scores higher on agent-friendliness (55 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 | Ultravox | Vapi |
|---|
| Starting price | $0.05 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 | ✓ | ✓ |
|---|
| Sandbox | ✗ | ✗ |
|---|
| Documented actions | 20 | 26 |
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Full data and citations: Ultravox · Vapi. See more Realtime Voice Agent APIs.