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Keen IO vs Open Notify

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

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

Keen IO vs Open Notify: common questions

Which is more reliable, Keen IO 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 Keen IO and Open Notify need an API key?

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

Can I call Keen IO and Open Notify from the browser?

Neither sends browser-friendly CORS headers reliably, so call Keen IO and Open Notify from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Keen IO and Open Notify free for commercial use?

Keen IO 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.