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Catchdoms Security API vs ItsThisForThat

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

APICatchdoms Security APINEW—ItsThisForThatNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished (docs ask you not to hammer it)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Catchdoms Security API vs ItsThisForThat: common questions

Which is more reliable, Catchdoms Security API or ItsThisForThat?

On our scheduled checks, ItsThisForThat leads on measured uptime — Catchdoms Security API at —% versus ItsThisForThat 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 Catchdoms Security API and ItsThisForThat need an API key?

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

Can I call Catchdoms Security API and ItsThisForThat from the browser?

Neither sends browser-friendly CORS headers reliably, so call Catchdoms Security API and ItsThisForThat from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Catchdoms Security API and ItsThisForThat free for commercial use?

Catchdoms Security API has unclear commercial terms, and ItsThisForThat 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.