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GrünstromIndex vs Open-Meteo Archive

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

APIGrünstromIndexNEW—Open-Meteo ArchiveNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree under fair-use policyFree — limits not published
Rate limitFair-use (paid tiers for higher limits)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GrünstromIndex vs Open-Meteo Archive: common questions

Which is more reliable, GrünstromIndex or Open-Meteo Archive?

On our scheduled checks, Open-Meteo Archive leads on measured uptime — GrünstromIndex at —% versus Open-Meteo Archive 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 Open-Meteo Archive need an API key?

Neither needs a paid key — GrünstromIndex is callable with no signup, and Open-Meteo Archive is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call GrünstromIndex and Open-Meteo Archive from the browser?

Yes — both GrünstromIndex and Open-Meteo Archive 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 Open-Meteo Archive free for commercial use?

GrünstromIndex has unclear commercial terms, and Open-Meteo Archive 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.