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CIRCL CVE Search vs The Guardian

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

APICIRCL CVE SearchHEALTHY89The GuardianHEALTHY89
Uptime · 30d
Uptime · 90d98.0%98.0%
Uptime · 30d96.7%98.3%
P50 · ms698742
P95 · ms27652726
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree developer key — registration required
Rate limitUnpublished5000 calls/day (developer tier)
In directory since2026-07-052026-07-05
operationalpartialdownno data

CIRCL CVE Search vs The Guardian: common questions

Which is more reliable, CIRCL CVE Search or The Guardian?

Both are neck-and-neck — CIRCL CVE Search and The Guardian each measure 98.0% 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, CIRCL CVE Search or The Guardian?

CIRCL CVE Search has the lower median latency in our checks — CIRCL CVE Search responds in 698 ms versus The Guardian at 742 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 The Guardian need an API key?

Both ask you to authenticate — CIRCL CVE Search uses an API key and The Guardian uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call CIRCL CVE Search and The Guardian from the browser?

Yes — both CIRCL CVE Search and The Guardian 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 The Guardian free for commercial use?

CIRCL CVE Search has unclear commercial terms, and The Guardian 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.