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US Weather vs Website Carbon

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

APIUS WeatherNEW—Website CarbonNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseU.S. Government work / public domainUnverified
Free tierFree (US Government public data)Free keyless byte-based /data endpoint
Rate limitUnpublished (asks for a User-Agent identifying your app)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

US Weather vs Website Carbon: common questions

Which is more reliable, US Weather or Website Carbon?

On our scheduled checks, Website Carbon leads on measured uptime — US Weather 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 US Weather and Website Carbon need an API key?

Neither needs a paid key — US Weather 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 US Weather and Website Carbon from the browser?

Only US Weather 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 US Weather and Website Carbon free for commercial use?

US Weather allows commercial use on its free tier, 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.