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GrünstromIndex vs Weatherstack

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

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Rate limitFair-use (paid tiers for higher limits)Unpublished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

GrünstromIndex vs Weatherstack: common questions

Which is more reliable, GrünstromIndex or Weatherstack?

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

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

Can I call GrünstromIndex and Weatherstack from the browser?

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

Are GrünstromIndex and Weatherstack free for commercial use?

GrünstromIndex has unclear commercial terms, and Weatherstack 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.