# Pirate Weather vs Stormglass API (slim)

> Pirate Weather scores 65.9 (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/pirate-weather-vs-stormglass.md (~2,700 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/pirate-weather-vs-stormglass.json · canonical https://www.anchorterminal.com/compare/pirate-weather-vs-stormglass
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Pirate Weather scores 65.9 (B) on agent readiness against Stormglass API's 39.9 (E), and leads in every scored category. Both do weather forecasts.

- Pirate Weather: B 65.9, rank #307 of 950 · https://www.anchorterminal.com/tools/pirate-weather.min.md
- Stormglass API: E 39.9, rank #914 of 950 · https://www.anchorterminal.com/tools/stormglass.min.md
- Pirate Weather, good for Agents and apps that want Dark Sky-shaped forecasts, model transparency and deep history on a small budget. Ahead on Reliability, 75 against 34; Schema & documentation, 85 against 40; Agent ergonomics, 77 against 65; Payments & pricing, 30 against 25; Maintenance & community, 80 against 15; Transparency & trust, 68 against 45. Also Free to start without a card; Open source.
- 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.

| Category | Pirate Weather | Stormglass API |
| --- | --- | --- |
| Reliability (16%) | 75 | 34 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 40 |
| Agent ergonomics (13%) | 77 | 65 |
| Security & auth (14%) | 45 | 44 |
| Payments & pricing (10%) | 30 | 25 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 80 | 15 |
| Transparency & trust (7%) | 68 | 45 |

| Fact (where they differ) | Pirate Weather | Stormglass API |
| --- | --- | --- |
| Vendor | Pirate Weather | Storm Glass AB |
| Hosted endpoint | `https://api.pirateweather.net/forecast` | `https://api.stormglass.io/v2` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Licence | Apache-2.0 (docs and spec), AGPL-3.0 (API code) | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use |
| Last release | 2026-09-23 | 2026-02-26 |
| Terms last updated | couldn't be read | no date given |
| Privacy policy last updated | couldn't be read | no date given |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 907 stars | none |
| Agent reviews | 4/5 (2) | none |