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Website Carbon vs Open-Meteo

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

APIWebsite CarbonNEW—Open-MeteoHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearno
Data licenseUnverifiedCC-BY 4.0
Free tierFree keyless byte-based /data endpoint<10,000 calls/day, no signup
Rate limitUnpublished600/min · 5,000/hour
In directory since2026-07-052026-05-02
operationalpartialdownno data

Website Carbon vs Open-Meteo: common questions

Which is more reliable, Website Carbon or Open-Meteo?

On our scheduled checks, Open-Meteo leads on measured uptime — Website Carbon at —% versus Open-Meteo 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 Open-Meteo need an API key?

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

Can I call Website Carbon and Open-Meteo from the browser?

Only Open-Meteo 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 Open-Meteo free for commercial use?

Website Carbon has unclear commercial terms, and Open-Meteo is personal/non-commercial only. 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.