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AviationWeather vs Free UV Index API

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

APIAviationWeatherHEALTHY64Free UV Index APIHEALTHY94
Uptime · 30d
Uptime · 90d93.1%99.02%
Uptime · 30d91.7%98.3%
P50 · ms450284
P95 · ms47342611
Authnonenone
CORSnoyes
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Rate limitUnpublished (NWS requests reasonable use)Unpublished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 Free UV Index API: common questions

Which is more reliable, AviationWeather or Free UV Index API?

On our scheduled checks, Free UV Index API leads on measured uptime — AviationWeather at 93.1% versus Free UV Index API at 99.02% 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 Free UV Index API?

Free UV Index API has the lower median latency in our checks — AviationWeather responds in 450 ms versus Free UV Index API at 284 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 Free UV Index API need an API key?

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

Can I call AviationWeather and Free UV Index API from the browser?

Only Free UV Index API 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 Free UV Index API free for commercial use?

AviationWeather allows commercial use on its free tier, and Free UV Index 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.