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GrünstromIndex vs IPMA

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

APIGrünstromIndexNEW—IPMANEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedIPMA open data (attribution 'Fonte: IPMA' expected)
Free tierFree under fair-use policyFree, no key
Rate limitFair-use (paid tiers for higher limits)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GrünstromIndex vs IPMA: common questions

Which is more reliable, GrünstromIndex or IPMA?

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

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

Can I call GrünstromIndex and IPMA from the browser?

Yes — both GrünstromIndex and IPMA 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 IPMA free for commercial use?

GrünstromIndex has unclear commercial terms, and IPMA 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.