7Timer! vs National Grid ESO
Same instrument, two spec sheets — measured, not claimed.
7Timer! vs National Grid ESO: common questions
Which is more reliable, 7Timer! or National Grid ESO?
Both are neck-and-neck — 7Timer! and National Grid ESO 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, 7Timer! or National Grid ESO?
7Timer! has the lower median latency in our checks — 7Timer! responds in 600 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 7Timer! and National Grid ESO need an API key?
Neither needs a paid key — 7Timer! 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 7Timer! and National Grid ESO from the browser?
Only National Grid ESO is browser-friendly — it returns CORS headers over HTTPS. 7Timer! needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are 7Timer! and National Grid ESO free for commercial use?
7Timer! 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.