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Bright Sky (DWD) vs Weatherstack

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

APIBright Sky (DWD)NEW—WeatherstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierUnlimited, no key, no credit cardFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Bright Sky (DWD) vs Weatherstack: common questions

Which is more reliable, Bright Sky (DWD) or Weatherstack?

On our scheduled checks, Weatherstack leads on measured uptime — Bright Sky (DWD) 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 Bright Sky (DWD) and Weatherstack need an API key?

Bright Sky (DWD) needs no key, while Weatherstack requires a free API key. If you want to start calling without signup, reach for Bright Sky (DWD) first.

Can I call Bright Sky (DWD) and Weatherstack from the browser?

Only Bright Sky (DWD) 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 Bright Sky (DWD) and Weatherstack free for commercial use?

Bright Sky (DWD) 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.