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Callook.info vs Open VSX Registry API

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

APICallook.infoNEW—Open VSX Registry APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublished10800 req/window · 10799 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs Open VSX Registry API: common questions

Which is more reliable, Callook.info or Open VSX Registry API?

On our scheduled checks, Open VSX Registry API leads on measured uptime — Callook.info at —% versus Open VSX Registry API 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 Callook.info and Open VSX Registry API need an API key?

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

Can I call Callook.info and Open VSX Registry API from the browser?

Yes — both Callook.info and Open VSX Registry API 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 Open VSX Registry API free for commercial use?

Callook.info has unclear commercial terms, and Open VSX Registry API 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.