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Callook.info vs CIRCL CVE Search

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

APICallook.infoHEALTHY92CIRCL CVE SearchHEALTHY90
Uptime · 30d
Uptime · 90d100%96.1%
Uptime · 30d100%94.8%
P50 · ms151503
P95 · ms11562899
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedRetry-After: 5s
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs CIRCL CVE Search: common questions

Which is more reliable, Callook.info or CIRCL CVE Search?

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus CIRCL CVE Search at 96.1% 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, Callook.info or CIRCL CVE Search?

Callook.info has the lower median latency in our checks — Callook.info responds in 151 ms versus CIRCL CVE Search at 503 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 Callook.info and CIRCL CVE Search need an API key?

Callook.info needs no key, while CIRCL CVE Search requires a free API key. If you want to start calling without signup, reach for Callook.info first.

Can I call Callook.info and CIRCL CVE Search from the browser?

Only Callook.info is browser-friendly — it returns CORS headers over HTTPS. CIRCL CVE Search needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Callook.info and CIRCL CVE Search free for commercial use?

Callook.info has unclear commercial terms, and CIRCL CVE Search 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.