National Grid ESO vs openSenseMap
Same instrument, two spec sheets — measured, not claimed.
National Grid ESO vs openSenseMap: common questions
Which is more reliable, National Grid ESO or openSenseMap?
On our scheduled checks, National Grid ESO leads on measured uptime — National Grid ESO at 100% versus openSenseMap at 90.2% 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, National Grid ESO or openSenseMap?
National Grid ESO has the lower median latency in our checks — National Grid ESO responds in 609 ms versus openSenseMap at 655 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 National Grid ESO and openSenseMap need an API key?
Neither needs a paid key — National Grid ESO is callable with no signup, and openSenseMap is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call National Grid ESO and openSenseMap from the browser?
Yes — both National Grid ESO and openSenseMap 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 National Grid ESO and openSenseMap free for commercial use?
National Grid ESO has unclear commercial terms, and openSenseMap 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.