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AviationWeather vs Danish data service Energi

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

APIAviationWeatherNEW—Danish data service EnergiNEW—
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 — no API key
Rate limitUnpublished (NWS requests reasonable use)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AviationWeather vs Danish data service Energi: common questions

Which is more reliable, AviationWeather or Danish data service Energi?

On our scheduled checks, Danish data service Energi leads on measured uptime — AviationWeather at —% versus Danish data service Energi 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 Danish data service Energi need an API key?

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

Can I call AviationWeather and Danish data service Energi from the browser?

Neither sends browser-friendly CORS headers reliably, so call AviationWeather and Danish data service Energi 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 Danish data service Energi free for commercial use?

AviationWeather allows commercial use on its free tier, and Danish data service Energi 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.