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Diffbot API vs Open Notify

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

APIDiffbot APIUNMONITORED—Open NotifyDYING—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree tier — API key may be required for productionUnlimited (volunteer-run)
Rate limitUnpublishedPlease be gentle
In directory since2026-07-052026-05-02
operationalpartialdownno data

Diffbot API vs Open Notify: common questions

Which is more reliable, Diffbot API or Open Notify?

Only Open Notify is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Diffbot API and Open Notify need an API key?

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

Can I call Diffbot API and Open Notify from the browser?

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

Are Diffbot API and Open Notify free for commercial use?

Diffbot API has unclear commercial terms, and Open Notify 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.