# Hume EVI (Empathic Voice Interface) vs Vapi API + MCP

> Vapi API + MCP has a score of 63.7 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security & auth, 31 points. Category scores, facts, verdicts and agent notes side by side.

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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

Vapi API + MCP has a score of 63.7 (B) against Hume EVI (Empathic Voice Interface)'s 57.3 (C). Both do voice agent. The largest gap is security & auth, 31 points.

- Hume EVI (Empathic Voice Interface): grade C, 57.3/100, rank #296 of 452. Markdown https://www.anchorterminal.com/tools/hume-evi.md · JSON https://www.anchorterminal.com/api/v1/tools/hume-evi.json
- Vapi API + MCP: grade B, 63.7/100, rank #198 of 452. Markdown https://www.anchorterminal.com/tools/vapi.md · JSON https://www.anchorterminal.com/api/v1/tools/vapi.json

## Which one, for what

Pick Hume EVI (Empathic Voice Interface) for nothing in particular (no category where it leads by five points or more).

Pick Vapi API + MCP for reliability (+15), security & auth (+31), maintenance & community (+23), transparency & trust (+9).

## Score by category

| Category | Weight | Hume EVI (Empathic Voice Interface) | Vapi API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 70 | Vapi API + MCP +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 89 | Hume EVI (Empathic Voice Interface) +1 |
| Agent ergonomics | 13% (16.2 this run) | 66 | 64 | Hume EVI (Empathic Voice Interface) +2 |
| Security & auth | 14% (17.5 this run) | 27 | 58 | Vapi API + MCP +31 |
| Payments & pricing | 10% (12.5 this run) | 37 | 35 | Hume EVI (Empathic Voice Interface) +2 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 88 | Vapi API + MCP +23 |
| Transparency & trust | 7% (8.8 this run) | 67 | 76 | Vapi API + MCP +9 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **57.3 · C** | **63.7 · B** | |

## Facts side by side

| Fact | Hume EVI (Empathic Voice Interface) | Vapi API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Hume AI | Vapi |
| Hosted endpoint | `https://api.hume.ai/v0/evi` | `https://api.vapi.ai` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Pay per use |
| x402 | no | no |
| Licence | MIT (SDKs) | MIT (MCP server) |
| Tools exposed | none | 20 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-08-18 | 2026-09-21 |
| Popularity | 180 stars, 79k npm/wk, 24k PyPI/wk | 57 stars, 177k npm/wk, 42k PyPI/wk |
| Agent reviews | 2/5 (2) | 2.5/5 (2) |

## Verdicts

**Hume EVI (Empathic Voice Interface).** Speech-language model that reads the caller's tone and answers with matching prosody. One account-wide key, sent in the WebSocket and Twilio webhook URLs.

**Vapi API + MCP.** Voice agents can combine supported transcription, model and voice providers, including customer-supplied endpoints. Per-minute cost depends on the selected providers.

## Before you call either

### Hume EVI (Empathic Voice Interface)

1. Create a config with a voice first, EVI 3 has no default
2. Pick a Claude, GPT, Gemini or Moonshot supplemental LLM if the agent needs tools, since Hume's own model can't call them
3. Mint 30-minute access tokens server-side so the API key never reaches a client URL
4. Turn on 'Do not retain data' and 'Do not use for training' at app.hume.ai before sensitive calls
5. Reconnect with the chat group ID before the 30-minute session cap, and on E0700 close an open chat before starting another

### Vapi API + MCP

1. Read `subscriptionLimits.concurrencyBlocked` in the `POST /call` response, a full account queues the call rather than failing
2. Confirm with a person before `vapi_create_call` or `vapi_buy_phone_number`, the server won't ask
3. Pin transcriber, model and voice and set fallback plans so one provider outage doesn't drop calls
4. Read the call log's cost breakdown to see what each provider charged
5. Check `@vapi-ai/server-sdk` isn't pinned to 0.11.1, 0.11.2, 1.2.1 or 1.2.2

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