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AviationWeather vs GrünstromIndex

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

APIAviationWeatherNEW—GrünstromIndexNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain (U.S. Government / NOAA)Unverified
Free tierFree, no keyFree under fair-use policy
Rate limitUnpublished (NWS requests reasonable use)Fair-use (paid tiers for higher limits)
In directory since2026-07-052026-07-05
operationalpartialdownno data

AviationWeather vs GrünstromIndex: common questions

Which is more reliable, AviationWeather or GrünstromIndex?

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

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

Can I call AviationWeather and GrünstromIndex from the browser?

Only GrünstromIndex 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 AviationWeather and GrünstromIndex free for commercial use?

AviationWeather allows commercial use on its free tier, and GrünstromIndex 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.