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Userstack vs Vector Express v2.0

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

APIUserstackNEW—Vector Express v2.0NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree
Rate limitUnpublished5 req/window · 4 remaining · resets 1783513379
In directory since2026-07-052026-07-05
operationalpartialdownno data

Userstack vs Vector Express v2.0: common questions

Which is more reliable, Userstack or Vector Express v2.0?

On our scheduled checks, Vector Express v2.0 leads on measured uptime — Userstack at —% versus Vector Express v2.0 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 Vector Express v2.0 need an API key?

Vector Express v2.0 needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for Vector Express v2.0 first.

Can I call Userstack and Vector Express v2.0 from the browser?

Only Userstack is browser-friendly — it returns CORS headers over HTTPS. Vector Express v2.0 needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Userstack and Vector Express v2.0 free for commercial use?

Userstack has unclear commercial terms, and Vector Express v2.0 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.