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AviationWeather vs GrünstromIndex

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

APIAviationWeatherHEALTHY64GrünstromIndexHEALTHY53
Uptime · 30d
Uptime · 90d93.1%73.5%
Uptime · 30d91.7%73.3%
P50 · ms4501072
P95 · ms47344119
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, AviationWeather leads on measured uptime — AviationWeather at 93.1% versus GrünstromIndex at 73.5% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, AviationWeather or GrünstromIndex?

AviationWeather has the lower median latency in our checks — AviationWeather responds in 450 ms versus GrünstromIndex at 1072 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.