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CIRCL CVE Search vs Free Dictionary API

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

APICIRCL CVE SearchHEALTHY89Free Dictionary APIHEALTHY90
Uptime · 30d
Uptime · 90d98.0%100%
Uptime · 30d96.7%100%
P50 · ms698674
P95 · ms27652196
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CIRCL CVE Search vs Free Dictionary API: common questions

Which is more reliable, CIRCL CVE Search or Free Dictionary API?

On our scheduled checks, Free Dictionary API leads on measured uptime — CIRCL CVE Search at 98.0% versus Free Dictionary API at 100% 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, CIRCL CVE Search or Free Dictionary API?

Free Dictionary API has the lower median latency in our checks — CIRCL CVE Search responds in 698 ms versus Free Dictionary API at 674 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 CIRCL CVE Search and Free Dictionary API need an API key?

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

Can I call CIRCL CVE Search and Free Dictionary API from the browser?

Yes — both CIRCL CVE Search and Free Dictionary API 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 CIRCL CVE Search and Free Dictionary API free for commercial use?

CIRCL CVE Search has unclear commercial terms, and Free Dictionary API 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.