GrünstromIndex vs Weatherstack
Same instrument, two spec sheets — measured, not claimed.
GrünstromIndex vs Weatherstack: common questions
Which is more reliable, GrünstromIndex or Weatherstack?
On our scheduled checks, Weatherstack leads on measured uptime — GrünstromIndex at 74.7% versus Weatherstack at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, GrünstromIndex or Weatherstack?
Weatherstack has the lower median latency in our checks — GrünstromIndex responds in 1101 ms versus Weatherstack at 200 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 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.