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GrünstromIndex vs Weather Underground API

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

APIGrünstromIndexNEW—Weather Underground APIREACHABLE—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree under fair-use policyFree tier — API key may be required for production
Rate limitFair-use (paid tiers for higher limits)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GrünstromIndex vs Weather Underground API: common questions

Which is more reliable, GrünstromIndex or Weather Underground API?

On our scheduled checks, Weather Underground API leads on measured uptime — GrünstromIndex at —% versus Weather Underground API 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 GrünstromIndex and Weather Underground API need an API key?

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

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

Yes — both GrünstromIndex and Weather Underground API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are GrünstromIndex and Weather Underground API free for commercial use?

GrünstromIndex 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.