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Cataas vs RandomDuck

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

APICataasNEW—RandomDuckNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Cataas vs RandomDuck: common questions

Which is more reliable, Cataas or RandomDuck?

On our scheduled checks, RandomDuck leads on measured uptime — Cataas at —% versus RandomDuck at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Cataas and RandomDuck need an API key?

Neither needs a paid key — Cataas is callable with no signup, and RandomDuck is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Cataas and RandomDuck from the browser?

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

Are Cataas and RandomDuck free for commercial use?

Cataas has unclear commercial terms, and RandomDuck 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.