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Sunrise-Sunset vs Website Carbon

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

APISunrise-SunsetNEW—Website CarbonNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licensen/aUnverified
Free tierUnlimited, attribution requestedFree keyless byte-based /data endpoint
Rate limitNo burst trafficUnpublished
In directory since2026-06-222026-07-05
operationalpartialdownno data

Sunrise-Sunset vs Website Carbon: common questions

Which is more reliable, Sunrise-Sunset or Website Carbon?

On our scheduled checks, Website Carbon leads on measured uptime — Sunrise-Sunset 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 Sunrise-Sunset and Website Carbon need an API key?

Neither needs a paid key — Sunrise-Sunset 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 Sunrise-Sunset and Website Carbon from the browser?

Only Sunrise-Sunset 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 Sunrise-Sunset and Website Carbon free for commercial use?

Sunrise-Sunset 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.