IPMA vs National Grid ESO
Same instrument, two spec sheets — measured, not claimed.
IPMA vs National Grid ESO: common questions
Which is more reliable, IPMA or National Grid ESO?
On our scheduled checks, National Grid ESO leads on measured uptime — IPMA at 98.0% versus National Grid ESO 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 National Grid ESO?
National Grid ESO has the lower median latency in our checks — IPMA responds in 1024 ms versus National Grid ESO at 609 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 National Grid ESO need an API key?
Neither needs a paid key — IPMA is callable with no signup, and National Grid ESO is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call IPMA and National Grid ESO from the browser?
Yes — both IPMA and National Grid ESO send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are IPMA and National Grid ESO free for commercial use?
IPMA has unclear commercial terms, and National Grid ESO 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.