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Lookup.im API vs UUID Generator API

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

APILookup.im APIHEALTHY84UUID Generator APIHEALTHY91
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d100%100%
P50 · ms1158737
P95 · ms35811570
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Lookup.im API vs UUID Generator API: common questions

Which is more reliable, Lookup.im API or UUID Generator API?

On our scheduled checks, UUID Generator API leads on measured uptime — Lookup.im API at 99.02% versus UUID Generator API 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, Lookup.im API or UUID Generator API?

UUID Generator API has the lower median latency in our checks — Lookup.im API responds in 1158 ms versus UUID Generator API at 737 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 Lookup.im API and UUID Generator API need an API key?

UUID Generator API needs no key, while Lookup.im API requires a free API key. If you want to start calling without signup, reach for UUID Generator API first.

Can I call Lookup.im API and UUID Generator API from the browser?

Neither sends browser-friendly CORS headers reliably, so call Lookup.im API and UUID Generator API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Lookup.im API and UUID Generator API free for commercial use?

Lookup.im API has unclear commercial terms, and UUID Generator 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.