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Userstack vs UUID Generator

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

APIUserstackNEW—UUID GeneratorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublished60 req/window · 59 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Userstack vs UUID Generator: common questions

Which is more reliable, Userstack or UUID Generator?

On our scheduled checks, UUID Generator leads on measured uptime — Userstack at —% versus UUID Generator 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 Userstack and UUID Generator need an API key?

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

Can I call Userstack and UUID Generator from the browser?

Yes — both Userstack and UUID Generator 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 Userstack and UUID Generator free for commercial use?

Userstack has unclear commercial terms, and UUID Generator 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.