# DIDWW Voice and Number Management API vs SignalWire Voice API (slim)

> SignalWire Voice scores 67.1 (B) to DIDWW Voice and Number Management's 65.1 (B) for phone numbers. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.md (~2,900 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice.json · canonical https://www.anchorterminal.com/compare/didww-voice-and-number-management-vs-signalwire-voice
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

SignalWire Voice API scores 67.1 (B) on agent readiness against DIDWW Voice and Number Management API's 65.1 (B), and leads in 3 of 7 scored categories. DIDWW Voice and Number Management API leads on reliability and agent ergonomics. Both do phone numbers.

- DIDWW Voice and Number Management API: B 65.1, rank #330 of 950 · https://www.anchorterminal.com/tools/didww-voice-and-number-management.min.md
- SignalWire Voice API: B 67.1, rank #261 of 950 · https://www.anchorterminal.com/tools/signalwire-voice.min.md
- DIDWW Voice and Number Management API, good for Teams that run their own SIP system, or a voice agent platform that accepts SIP trunks, and need numbers in many countries with compliance records handled through an API. Ahead on Reliability, 66 against 53; Agent ergonomics, 77 against 68. Also A hosted endpoint, with nothing to install.
- SignalWire Voice API, good for Builders who want call logic in documents (SWML) or a hosted AI agent verb, and for teams moving off Twilio's API shape. Ahead on Security & auth, 72 against 57; Payments & pricing, 40 against 15; Transparency & trust, 76 against 70.

| Category | DIDWW Voice and Number Management API | SignalWire Voice API |
| --- | --- | --- |
| Reliability (16%) | 66 | 53 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 87 |
| Agent ergonomics (13%) | 77 | 68 |
| Security & auth (14%) | 57 | 72 |
| Payments & pricing (10%) | 15 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 83 | 81 |
| Transparency & trust (7%) | 70 | 76 |

| Fact (where they differ) | DIDWW Voice and Number Management API | SignalWire Voice API |
| --- | --- | --- |
| Vendor | DIDWW Ireland Limited | SignalWire |
| Hosted endpoint | `https://api.didww.com/mcp` | no (local only) |
| Price for phone numbers | not published | $0.0066 per minute of call |
| Licence | Proprietary service under the DIDWW Terms and Agreements (Rev 3.1). The OpenAPI repository and the official SDKs are MIT | MIT |
| Last release | 2026-10-07 | 2026-09-30 |
| Terms last updated | no date given |  |
| Privacy policy last updated | no date given | couldn't be read |
| 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 |  |
| Popularity | 10 stars, 462 npm/wk | 8 stars, 1.5k npm/wk, 1.3k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |