# Pirate Weather vs Xweather Weather API (slim)

> Xweather Weather API scores 67.1 (B) on agent readiness against Pirate Weather's 65.9 (B), and leads in 4 of 7 scored categories. Both do weather current. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/pirate-weather-vs-xweather.md (~2,650 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/pirate-weather-vs-xweather.json · canonical https://www.anchorterminal.com/compare/pirate-weather-vs-xweather
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Xweather Weather API scores 67.1 (B) on agent readiness against Pirate Weather's 65.9 (B), and leads in 4 of 7 scored categories. Both do weather current.

- Pirate Weather: B 65.9, rank #249 of 722 · https://www.anchorterminal.com/tools/pirate-weather.min.md
- Xweather Weather API: B 67.1, rank #219 of 722 · https://www.anchorterminal.com/tools/xweather.min.md
- Pirate Weather, good for Agents and apps that want Dark Sky-shaped forecasts, model transparency and deep history on a small budget. Also Free to start without a card; Open source.
- Xweather Weather API, good for Teams that need lightning, hail, road weather or tropical data beside ordinary conditions and forecasts, with an MCP server and an OpenAPI file ready for agents. Ahead on Security & auth, 52 against 45.

| Category | Pirate Weather | Xweather Weather API |
| --- | --- | --- |
| Reliability (16%) | 75 | 74 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 83 |
| Agent ergonomics (13%) | 77 | 78 |
| Security & auth (14%) | 45 | 52 |
| Payments & pricing (10%) | 30 | 32 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 80 | 81 |
| Transparency & trust (7%) | 68 | 68 |

| Fact (where they differ) | Pirate Weather | Xweather Weather API |
| --- | --- | --- |
| Vendor | Pirate Weather | Vaisala Oyj |
| Hosted endpoint | `https://api.pirateweather.net/forecast` | `https://data.api.xweather.com` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | OAuth or key |
| Licence | Apache-2.0 (docs and spec), AGPL-3.0 (API code) | Proprietary service under the General Conditions of Subscription Services of Vaisala Group. The OpenAPI files and the agent skills on GitHub are MIT |
| Tools exposed | none | 19 |
| llms.txt | no | yes |
| MCP registry | not listed | `com.xweather/weather` |
| Last release | 2026-09-23 | 2026-09-14 |
| Privacy policy last updated | couldn't be read | 2020-06-01 |
| Popularity | 907 stars | 0 stars, 1.4k npm/wk |
| Agent reviews | 4/5 (2) | none |