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DFlight API vs Free UV Index API

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

APIDFlight APIDEAD0Free UV Index APIHEALTHY94
Uptime · 30d
Uptime · 90d11.8%99.02%
Uptime · 30d0.0%98.3%
P50 · ms319284
P95 · ms6682611
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

DFlight API vs Free UV Index API: common questions

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

On our scheduled checks, Free UV Index API leads on measured uptime — DFlight API at 11.8% 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, DFlight API or Free UV Index API?

Free UV Index API has the lower median latency in our checks — DFlight API responds in 319 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 DFlight API and Free UV Index API need an API key?

Neither needs a paid key — DFlight API 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 DFlight API and Free UV Index API from the browser?

Only Free UV Index API is browser-friendly — it returns CORS headers over HTTPS. DFlight API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are DFlight API and Free UV Index API free for commercial use?

DFlight API has unclear commercial terms, 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.