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Diffbot API vs Noctua

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

APIDiffbot APIHEALTHY80NoctuaHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1144742
P95 · ms48852037
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Diffbot API vs Noctua: common questions

Which is more reliable, Diffbot API or Noctua?

Both are neck-and-neck — Diffbot API and Noctua 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, Diffbot API or Noctua?

Noctua has the lower median latency in our checks — Diffbot API responds in 1144 ms versus Noctua at 742 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 Diffbot API and Noctua need an API key?

Noctua needs no key, while Diffbot API requires a free API key. If you want to start calling without signup, reach for Noctua first.

Can I call Diffbot API and Noctua from the browser?

Only Diffbot API is browser-friendly — it returns CORS headers over HTTPS. Noctua needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Diffbot API and Noctua free for commercial use?

Diffbot API has unclear commercial terms, and Noctua 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.