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AviationWeather vs Glax Weather API

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

APIAviationWeatherNEW—Glax Weather APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain (U.S. Government / NOAA)Unverified
Free tierFree, no keyFree — limits not published
Rate limitUnpublished (NWS requests reasonable use)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AviationWeather vs Glax Weather API: common questions

Which is more reliable, AviationWeather or Glax Weather API?

On our scheduled checks, Glax Weather API leads on measured uptime — AviationWeather at —% versus Glax Weather API 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 AviationWeather and Glax Weather API need an API key?

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

Can I call AviationWeather and Glax Weather API from the browser?

Neither sends browser-friendly CORS headers reliably, so call AviationWeather and Glax Weather API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are AviationWeather and Glax Weather API free for commercial use?

AviationWeather allows commercial use on its free tier, and Glax Weather API has unclear commercial terms. 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.