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Free UV Index API vs Glax Weather API

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

APIFree UV Index APIHEALTHY94Glax Weather APIHEALTHY87
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d98.3%100%
P50 · ms2841004
P95 · ms26112534
Authnonenone
CORSyesno
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

Free UV Index API vs Glax Weather API: common questions

Which is more reliable, Free UV Index API or Glax Weather API?

On our scheduled checks, Glax Weather API leads on measured uptime — Free UV Index API at 99.02% versus Glax Weather API at 100% 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, Free UV Index API or Glax Weather API?

Free UV Index API has the lower median latency in our checks — Free UV Index API responds in 284 ms versus Glax Weather API at 1004 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 Free UV Index API and Glax Weather API need an API key?

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

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

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

Are Free UV Index API and Glax Weather API free for commercial use?

Free UV Index API has unclear commercial terms, and Glax Weather 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.