Cataas vs RandomDuck
Same instrument, two spec sheets — measured, not claimed.
Cataas vs RandomDuck: common questions
Which is more reliable, Cataas or RandomDuck?
Both are neck-and-neck — Cataas and RandomDuck each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, Cataas or RandomDuck?
RandomDuck has the lower median latency in our checks — Cataas responds in 601 ms versus RandomDuck at 459 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
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.