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

> Synthflow scores 51.1 (D) 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-synthflow.md (~2,800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.json · canonical https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow
- 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)

Synthflow API + MCP scores 51.1 (D) on agent readiness against Harmony.ai's 43.5 (E), and leads in 5 of 7 scored categories. Harmony.ai leads on agent ergonomics and payments & pricing. Both do voice agents.

- Harmony.ai: E 43.5, rank #1031 of 1175 · https://www.anchorterminal.com/tools/harmony-ai.min.md
- Synthflow API + MCP: D 51.1, rank #870 of 1175 · https://www.anchorterminal.com/tools/synthflow.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. Ahead on Agent ergonomics, 65 against 45; Payments & pricing, 15 against 0.
- Synthflow API + MCP, good for Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency. Ahead on Reliability, 45 against 18; Schema & documentation, 87 against 77; Maintenance & community, 68 against 42; Transparency & trust, 66 against 56.

| Category | Harmony.ai | Synthflow API + MCP |
| --- | --- | --- |
| Reliability (16%) | 18 | 45 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 87 |
| Agent ergonomics (13%) | 65 | 45 |
| Security & auth (14%) | 48 | 51 |
| Payments & pricing (10%) | 15 | 0 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 42 | 68 |
| Transparency & trust (7%) | 56 | 66 |

| Fact (where they differ) | Harmony.ai | Synthflow API + MCP |
| --- | --- | --- |
| Vendor | monday.com Ltd. (Harmony.ai) | Synthflow |
| Hosted endpoint | `https://api.harmony.ai` | `https://api.synthflow.ai/v2` |
| Auth | API key | OAuth or key |
| 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 | none |
| Tools exposed | 6 | 60 |
| Read-only variant documented | yes | no |
| Last release | none | 2026-10-01 |
| Terms last updated |  | 2026-05-13 |
| Privacy policy last updated |  | no date given |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Agent reviews | 2.3/5 (4) | 2/5 (2) |