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Callook.info vs Umeå Open Data

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

APICallook.infoHEALTHY94Umeå Open DataHEALTHY55
Uptime · 30d
Uptime · 90d100%89.2%
Uptime · 30d100%81.7%
P50 · ms4371445
P95 · ms11564863
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Varies by dataset (municipal open data; see portal)
Free tierFree — limits not publishedFree — open data portal, no key
Rate limitUnpublished1000 req/window · 999 remaining · resets 2026-07-09 00:00:00+00:00
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs Umeå Open Data: common questions

Which is more reliable, Callook.info or Umeå Open Data?

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus Umeå Open Data at 89.2% 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 Umeå Open Data?

Callook.info has the lower median latency in our checks — Callook.info responds in 437 ms versus Umeå Open Data at 1445 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 Umeå Open Data need an API key?

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

Can I call Callook.info and Umeå Open Data from the browser?

Yes — both Callook.info and Umeå Open Data 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 Callook.info and Umeå Open Data free for commercial use?

Callook.info has unclear commercial terms, and Umeå Open Data 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.