shipapis
StarSubmit an APISubmit API

Glax Weather API vs Weather Underground API

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

APIGlax Weather APIHEALTHY87Weather Underground APIREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1004104
P95 · ms25341117
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Glax Weather API vs Weather Underground API: common questions

Which is more reliable, Glax Weather API or Weather Underground API?

Both are neck-and-neck — Glax Weather API and Weather Underground API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Glax Weather API or Weather Underground API?

Weather Underground API has the lower median latency in our checks — Glax Weather API responds in 1004 ms versus Weather Underground API at 104 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 Glax Weather API and Weather Underground API need an API key?

Glax Weather API needs no key, while Weather Underground API requires a free API key. If you want to start calling without signup, reach for Glax Weather API first.

Can I call Glax Weather API and Weather Underground API from the browser?

Only Weather Underground 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 Glax Weather API and Weather Underground API free for commercial use?

Glax Weather API has unclear commercial terms, and Weather Underground 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.