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National Grid ESO vs Weatherstack

Same instrument, two spec sheets — measured, not claimed.

APINational Grid ESONEW—WeatherstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseNESO Open Data Licence (OGL-based); varies per datasetUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

National Grid ESO vs Weatherstack: common questions

Which is more reliable, National Grid ESO or Weatherstack?

On our scheduled checks, Weatherstack leads on measured uptime — National Grid ESO at —% versus Weatherstack at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do National Grid ESO and Weatherstack need an API key?

National Grid ESO needs no key, while Weatherstack requires a free API key. If you want to start calling without signup, reach for National Grid ESO first.

Can I call National Grid ESO and Weatherstack from the browser?

Only National Grid ESO is browser-friendly — it returns CORS headers over HTTPS. Weatherstack needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are National Grid ESO and Weatherstack free for commercial use?

National Grid ESO has unclear commercial terms, and Weatherstack 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.