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Weatherstack vs Website Carbon

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

APIWeatherstackNEW—Website CarbonNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree keyless byte-based /data endpoint
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Weatherstack vs Website Carbon: common questions

Which is more reliable, Weatherstack or Website Carbon?

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

Website Carbon needs no key, while Weatherstack requires a free API key. If you want to start calling without signup, reach for Website Carbon first.

Can I call Weatherstack and Website Carbon from the browser?

Neither sends browser-friendly CORS headers reliably, so call Weatherstack and Website Carbon from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Weatherstack and Website Carbon free for commercial use?

Weatherstack 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.