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Data.parliament.uk vs ONS

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

APIData.parliament.ukNEW—ONSNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseOpen Parliament LicenceUnverified
Free tierFree / open dataFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Data.parliament.uk vs ONS: common questions

Which is more reliable, Data.parliament.uk or ONS?

On our scheduled checks, ONS leads on measured uptime — Data.parliament.uk at —% versus ONS 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 Data.parliament.uk and ONS need an API key?

Neither needs a paid key — Data.parliament.uk is callable with no signup, and ONS is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Data.parliament.uk and ONS from the browser?

Yes — both Data.parliament.uk and ONS 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 Data.parliament.uk and ONS free for commercial use?

Data.parliament.uk allows commercial use on its free tier, and ONS 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.