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Datamuse vs OWASP API Security Project

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

APIDatamuseHEALTHY94OWASP API Security ProjectHEALTHY98
Uptime · 30d
Uptime · 90d92.2%100%
Uptime · 30d86.7%100%
P50 · ms180205
P95 · ms9261646
Authnonenone
CORSnoyes
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

Datamuse vs OWASP API Security Project: common questions

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

On our scheduled checks, OWASP API Security Project leads on measured uptime — Datamuse at 92.2% versus OWASP API Security Project 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, Datamuse or OWASP API Security Project?

Datamuse has the lower median latency in our checks — Datamuse responds in 180 ms versus OWASP API Security Project at 205 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 Datamuse and OWASP API Security Project need an API key?

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

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

Only OWASP API Security Project is browser-friendly — it returns CORS headers over HTTPS. Datamuse needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Datamuse and OWASP API Security Project free for commercial use?

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