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Website Carbon vs wttr.in

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

APIWebsite CarbonNEW—wttr.inNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree keyless byte-based /data endpointFree — limits not published
Rate limitUnpublishedUnpublished (informal per-IP throttling)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Website Carbon vs wttr.in: common questions

Which is more reliable, Website Carbon or wttr.in?

On our scheduled checks, wttr.in leads on measured uptime — Website Carbon at —% versus wttr.in 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 Website Carbon and wttr.in need an API key?

Neither needs a paid key — Website Carbon is callable with no signup, and wttr.in is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Website Carbon and wttr.in from the browser?

Only wttr.in 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 Website Carbon and wttr.in free for commercial use?

Website Carbon has unclear commercial terms, and wttr.in 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.