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Callook.info vs Datamuse

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

APICallook.infoHEALTHY94DatamuseHEALTHY94
Uptime · 30d
Uptime · 90d100%92.2%
Uptime · 30d100%86.7%
P50 · ms437180
P95 · ms1156926
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs Datamuse: common questions

Which is more reliable, Callook.info or Datamuse?

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus Datamuse at 92.2% 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, Callook.info or Datamuse?

Datamuse has the lower median latency in our checks — Callook.info responds in 437 ms versus Datamuse at 180 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 Callook.info and Datamuse need an API key?

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

Can I call Callook.info and Datamuse from the browser?

Only Callook.info 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 Callook.info and Datamuse free for commercial use?

Callook.info has unclear commercial terms, and Datamuse 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.