# Ultravox Realtime API vs Vapi API + MCP (slim)

> Vapi API + MCP has a score of 63.7 (B) against Ultravox Realtime API's 58.6 (C). Both do voice agent. The largest gap is maintenance & community, 45 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/ultravox-vs-vapi.md (~1,600 tokens) · this version ~330 tokens · JSON https://www.anchorterminal.com/compare/ultravox-vs-vapi.json · canonical https://www.anchorterminal.com/compare/ultravox-vs-vapi
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

Vapi API + MCP has a score of 63.7 (B) against Ultravox Realtime API's 58.6 (C). Both do voice agent. The largest gap is maintenance & community, 45 points.

- Ultravox Realtime API: C 58.6, rank #279 of 452 · https://www.anchorterminal.com/tools/ultravox.min.md
- Vapi API + MCP: B 63.7, rank #198 of 452 · https://www.anchorterminal.com/tools/vapi.min.md
- Pick Ultravox Realtime API for agent ergonomics (+5), payments & pricing (+5). Pick Vapi API + MCP for reliability (+18), schema & documentation (+5), security & auth (+12), maintenance & community (+45).

| Category | Ultravox Realtime API | Vapi API + MCP |
| --- | --- | --- |
| Reliability (16%) | 52 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 84 | 89 |
| Agent ergonomics (13%) | 69 | 64 |
| Security & auth (14%) | 46 | 58 |
| Payments & pricing (10%) | 40 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 43 | 88 |
| Transparency & trust (7%) | 75 | 76 |