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Data.parliament.uk API vs Open Library

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

APIData.parliament.uk APIHEALTHY84Open LibraryHEALTHY73
Uptime · 30d
Uptime · 90d92.2%88.2%
Uptime · 30d91.7%81.7%
P50 · ms6781629
P95 · ms41644878
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedMixed — mostly open
Free tierFree tier — API key requiredUnlimited within courtesy limits
Rate limitUnpublishedSoft — identified UA appreciated
In directory since2026-07-052026-05-02
operationalpartialdownno data

Data.parliament.uk API vs Open Library: common questions

Which is more reliable, Data.parliament.uk API or Open Library?

On our scheduled checks, Data.parliament.uk API leads on measured uptime — Data.parliament.uk API at 92.2% versus Open Library at 88.2% 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 API or Open Library?

Data.parliament.uk API has the lower median latency in our checks — Data.parliament.uk API responds in 678 ms versus Open Library at 1629 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 API and Open Library need an API key?

Open Library needs no key, while Data.parliament.uk API requires a free API key. If you want to start calling without signup, reach for Open Library first.

Can I call Data.parliament.uk API and Open Library from the browser?

Yes — both Data.parliament.uk API and Open Library 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 API and Open Library free for commercial use?

Data.parliament.uk API has unclear commercial terms, and Open Library 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.