Data.parliament.uk vs ONS
Same instrument, two spec sheets — measured, not claimed.
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 99.02% versus ONS at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Data.parliament.uk or ONS?
Data.parliament.uk has the lower median latency in our checks — Data.parliament.uk responds in 362 ms versus ONS at 732 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 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.