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Cataas vs RandomFox

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

APICataasNEW—RandomFoxNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
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 RandomFox: common questions

Which is more reliable, Cataas or RandomFox?

On our scheduled checks, RandomFox leads on measured uptime — Cataas at —% versus RandomFox 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 RandomFox need an API key?

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

Can I call Cataas and RandomFox from the browser?

Yes — both Cataas and RandomFox 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 Cataas and RandomFox free for commercial use?

Cataas has unclear commercial terms, and RandomFox 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.