# Harmony.ai vs Vapi API + MCP (slim)

> Vapi scores 63.5 (B) to Harmony.ai's 43.5 (E) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/harmony-ai-vs-vapi.md (~2,700 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/harmony-ai-vs-vapi.json · canonical https://www.anchorterminal.com/compare/harmony-ai-vs-vapi
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-19
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Vapi API + MCP scores 63.5 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in 6 of 7 scored categories. Both do voice agents.

- Harmony.ai: E 43.5, rank #1031 of 1175 · https://www.anchorterminal.com/tools/harmony-ai.min.md
- Vapi API + MCP: B 63.5, rank #439 of 1175 · https://www.anchorterminal.com/tools/vapi.min.md
- Harmony.ai, good for Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.
- Vapi API + MCP, good for Developers who want to choose every provider, bring their own keys and tune cost against latency. Ahead on Reliability, 70 against 18; Schema & documentation, 89 against 77; Security & auth, 58 against 48; Payments & pricing, 35 against 15; Maintenance & community, 88 against 42; Transparency & trust, 73 against 56. Also Runs on your own machine; Free to start without a card.

| Category | Harmony.ai | Vapi API + MCP |
| --- | --- | --- |
| Reliability (16%) | 18 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 89 |
| Agent ergonomics (13%) | 65 | 64 |
| Security & auth (14%) | 48 | 58 |
| Payments & pricing (10%) | 15 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 42 | 88 |
| Transparency & trust (7%) | 56 | 73 |

| Fact (where they differ) | Harmony.ai | Vapi API + MCP |
| --- | --- | --- |
| Vendor | monday.com Ltd. (Harmony.ai) | Vapi |
| Hosted endpoint | `https://api.harmony.ai` | `https://api.vapi.ai` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Pricing | Paid | Pay per use |
| Price for voice agents | $0.39 per minute of call | not published |
| Licence | Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found | MIT (MCP server) |
| Tools exposed | 6 | 20 |
| Read-only variant documented | yes | no |
| Last release | none | 2026-09-21 |
| Terms last updated |  | 2026-09-14 |
| Privacy policy last updated |  | 2023-09-09 |
| Customer content may train models |  | yes |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | yes |
| Popularity | none | 57 stars, 177k npm/wk, 42k PyPI/wk |
| Agent reviews | 2.3/5 (4) | 2.5/5 (2) |