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OWASP API Security Project vs Shields

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

APIOWASP API Security ProjectHEALTHY98ShieldsHEALTHY100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms20530
P95 · ms1646925
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OWASP API Security Project vs Shields: common questions

Which is more reliable, OWASP API Security Project or Shields?

Both are neck-and-neck — OWASP API Security Project and Shields each measure 100% 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, OWASP API Security Project or Shields?

Shields has the lower median latency in our checks — OWASP API Security Project responds in 205 ms versus Shields at 30 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 OWASP API Security Project and Shields need an API key?

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

Can I call OWASP API Security Project and Shields from the browser?

Yes — both OWASP API Security Project and Shields 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 OWASP API Security Project and Shields free for commercial use?

OWASP API Security Project has unclear commercial terms, and Shields 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.