Cataas vs RescueGroups
Same instrument, two spec sheets — measured, not claimed.
Cataas vs RescueGroups: common questions
Which is more reliable, Cataas or RescueGroups?
On our scheduled checks, Cataas leads on measured uptime — Cataas at 100% versus RescueGroups at 97.1% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Cataas or RescueGroups?
Cataas has the lower median latency in our checks — Cataas responds in 601 ms versus RescueGroups at 700 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 RescueGroups need an API key?
Neither needs a paid key — Cataas is callable with no signup, and RescueGroups is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Cataas and RescueGroups from the browser?
Only Cataas is browser-friendly — it returns CORS headers over HTTPS. RescueGroups needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Cataas and RescueGroups free for commercial use?
Cataas has unclear commercial terms, and RescueGroups 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.