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AviationWeather vs UK Carbon Intensity

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

APIAviationWeatherNEW—UK Carbon IntensityNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useyesyes
Data licensePublic domain (U.S. Government / NOAA)CC BY 4.0 (per API docs)
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Rate limitUnpublished (NWS requests reasonable use)Unpublished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 UK Carbon Intensity: common questions

Which is more reliable, AviationWeather or UK Carbon Intensity?

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

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

Can I call AviationWeather and UK Carbon Intensity from the browser?

Only UK Carbon Intensity 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 UK Carbon Intensity free for commercial use?

AviationWeather allows commercial use on its free tier, and UK Carbon Intensity 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.