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Cat Facts vs Dog CEO

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

APICat FactsNEW—Dog CEOHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedStanford Dogs dataset
Free tierFree — limits not publishedUnlimited
Rate limit100 req/window · 96 remainingNone published
In directory since2026-07-052026-05-02
operationalpartialdownno data

Cat Facts vs Dog CEO: common questions

Which is more reliable, Cat Facts or Dog CEO?

On our scheduled checks, Dog CEO leads on measured uptime — Cat Facts at —% versus Dog CEO 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 Cat Facts and Dog CEO need an API key?

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

Can I call Cat Facts and Dog CEO from the browser?

Yes — both Cat Facts and Dog CEO 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 Cat Facts and Dog CEO free for commercial use?

Cat Facts has unclear commercial terms, and Dog CEO allows commercial use on its free tier. 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.