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Aare.guru API vs National Grid ESO

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

APIAare.guru APIHEALTHY88National Grid ESOHEALTHY92
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1025609
P95 · ms29931311
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedNESO Open Data Licence (OGL-based); varies per dataset
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Aare.guru API vs National Grid ESO: common questions

Which is more reliable, Aare.guru API or National Grid ESO?

Both are neck-and-neck — Aare.guru API 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, Aare.guru API or National Grid ESO?

National Grid ESO has the lower median latency in our checks — Aare.guru API responds in 1025 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 Aare.guru API and National Grid ESO need an API key?

Neither needs a paid key — Aare.guru API 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 Aare.guru API and National Grid ESO from the browser?

Yes — both Aare.guru API 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 Aare.guru API and National Grid ESO free for commercial use?

Aare.guru API 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.