US Weather vs Website Carbon
Same instrument, two spec sheets — measured, not claimed.
US Weather vs Website Carbon: common questions
Which is more reliable, US Weather or Website Carbon?
Both are neck-and-neck — US Weather and Website Carbon each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, US Weather or Website Carbon?
Website Carbon has the lower median latency in our checks — US Weather responds in 223 ms versus Website Carbon at 37 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
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.