IPMA vs Website Carbon
Same instrument, two spec sheets — measured, not claimed.
IPMA vs Website Carbon: common questions
Which is more reliable, IPMA or Website Carbon?
On our scheduled checks, Website Carbon leads on measured uptime — IPMA at 98.0% 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, IPMA or Website Carbon?
Website Carbon has the lower median latency in our checks — IPMA responds in 1024 ms versus Website Carbon at 38 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 IPMA and Website Carbon need an API key?
Neither needs a paid key — IPMA 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 IPMA and Website Carbon from the browser?
Only IPMA 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 IPMA and Website Carbon free for commercial use?
IPMA 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.