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National Grid ESO vs Storm Glass Marine Weather

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

APINational Grid ESONEW—Storm Glass Marine WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
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 Storm Glass Marine Weather: common questions

Which is more reliable, National Grid ESO or Storm Glass Marine Weather?

On our scheduled checks, Storm Glass Marine Weather leads on measured uptime — National Grid ESO at —% versus Storm Glass Marine Weather 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 Storm Glass Marine Weather need an API key?

National Grid ESO needs no key, while Storm Glass Marine Weather 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 Storm Glass Marine Weather from the browser?

Yes — both National Grid ESO and Storm Glass Marine Weather 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 Storm Glass Marine Weather free for commercial use?

National Grid ESO has unclear commercial terms, and Storm Glass Marine Weather 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.