openSenseMap vs Website Carbon
Same instrument, two spec sheets — measured, not claimed.
openSenseMap vs Website Carbon: common questions
Which is more reliable, openSenseMap or Website Carbon?
On our scheduled checks, Website Carbon leads on measured uptime — openSenseMap at 90.2% versus Website Carbon at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, openSenseMap or Website Carbon?
Website Carbon has the lower median latency in our checks — openSenseMap responds in 655 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 openSenseMap and Website Carbon need an API key?
Neither needs a paid key — openSenseMap 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 openSenseMap and Website Carbon from the browser?
Only openSenseMap 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 openSenseMap and Website Carbon free for commercial use?
openSenseMap 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.