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Aare.guru API vs AviationWeather

Same instrument, two spec sheets — measured, not claimed.

APIAare.guru APINEW—AviationWeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic domain (U.S. Government / NOAA)
Free tierFree — limits not publishedFree, no key
Rate limitUnpublishedUnpublished (NWS requests reasonable use)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Aare.guru API vs AviationWeather: common questions

Which is more reliable, Aare.guru API or AviationWeather?

On our scheduled checks, AviationWeather leads on measured uptime — Aare.guru API at —% versus AviationWeather at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Aare.guru API and AviationWeather need an API key?

Neither needs a paid key — Aare.guru API is callable with no signup, and AviationWeather is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Aare.guru API and AviationWeather from the browser?

Only Aare.guru API is browser-friendly — it returns CORS headers over HTTPS. AviationWeather needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Aare.guru API and AviationWeather free for commercial use?

Aare.guru API has unclear commercial terms, and AviationWeather allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.