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Bright Sky (DWD) vs Website Carbon

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

APIBright Sky (DWD)NEW—Website CarbonNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierUnlimited, no key, no credit cardFree keyless byte-based /data endpoint
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Bright Sky (DWD) vs Website Carbon: common questions

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

On our scheduled checks, Website Carbon leads on measured uptime — Bright Sky (DWD) at —% versus Website Carbon 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 Website Carbon need an API key?

Neither needs a paid key — Bright Sky (DWD) is callable with no signup, and Website Carbon is callable with no signup. Both are quick to prototype with; rate limits still apply.

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

Only Bright Sky (DWD) is browser-friendly — it returns CORS headers over HTTPS. Website Carbon needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Bright Sky (DWD) and Website Carbon free for commercial use?

Bright Sky (DWD) has unclear commercial terms, and Website Carbon 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.