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Datamuse vs HOL Registry Broker

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

APIDatamuseNEW—HOL Registry BrokerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Datamuse vs HOL Registry Broker: common questions

Which is more reliable, Datamuse or HOL Registry Broker?

On our scheduled checks, HOL Registry Broker leads on measured uptime — Datamuse at —% versus HOL Registry Broker at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Datamuse and HOL Registry Broker need an API key?

Datamuse needs no key, while HOL Registry Broker requires a free API key. If you want to start calling without signup, reach for Datamuse first.

Can I call Datamuse and HOL Registry Broker from the browser?

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

Are Datamuse and HOL Registry Broker free for commercial use?

Datamuse has unclear commercial terms, and HOL Registry Broker 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.