# Stormglass API vs WeatherAPI.com (slim)

> WeatherAPI.com scores 65.3 (B) to Stormglass's 39.9 (E) for weather forecasts. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/stormglass-vs-weatherapi-com.md (~2,650 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/stormglass-vs-weatherapi-com.json · canonical https://www.anchorterminal.com/compare/stormglass-vs-weatherapi-com
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

WeatherAPI.com scores 65.3 (B) on agent readiness against Stormglass API's 39.9 (E), and leads in 6 of 7 scored categories. Stormglass API leads on security & auth. Both do weather forecasts.

- Stormglass API: E 39.9, rank #914 of 950 · https://www.anchorterminal.com/tools/stormglass.min.md
- WeatherAPI.com: B 65.3, rank #321 of 950 · https://www.anchorterminal.com/tools/weatherapi-com.min.md
- Stormglass API, good for Marine and coastal applications that want waves, swell, currents and tides beside ordinary weather, and callers who want to compare named models in one response. Ahead on Security & auth, 44 against 37.
- WeatherAPI.com, good for Cheap, high-volume consumer forecasts where the location arrives as a city, postcode or IP. Ahead on Reliability, 90 against 34; Schema & documentation, 89 against 40; Agent ergonomics, 80 against 65; Payments & pricing, 30 against 25; Maintenance & community, 45 against 15; Transparency & trust, 65 against 45. Also Free to start without a card.

| Category | Stormglass API | WeatherAPI.com |
| --- | --- | --- |
| Reliability (16%) | 34 | 90 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 40 | 89 |
| Agent ergonomics (13%) | 65 | 80 |
| Security & auth (14%) | 44 | 37 |
| Payments & pricing (10%) | 25 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 15 | 45 |
| Transparency & trust (7%) | 45 | 65 |

| Fact (where they differ) | Stormglass API | WeatherAPI.com |
| --- | --- | --- |
| Vendor | Storm Glass AB | WeatherAPI.com (Zoomash Ltd) |
| Hosted endpoint | `https://api.stormglass.io/v2` | `https://api.weatherapi.com/v1` |
| Licence | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use | none |
| llms.txt | no | yes |
| Last release | 2026-02-26 | none |
| Terms restrict automated access | not found in the text | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Agent reviews | none | 3.5/5 (2) |