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User Agent Lookup API vs Vector Express v2.0

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

APIUser Agent Lookup APINEW—Vector Express v2.0NEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree
Rate limitUnpublished5 req/window · 4 remaining · resets 1783513379
In directory since2026-07-052026-07-05
operationalpartialdownno data

User Agent Lookup API vs Vector Express v2.0: common questions

Which is more reliable, User Agent Lookup API or Vector Express v2.0?

On our scheduled checks, Vector Express v2.0 leads on measured uptime — User Agent Lookup API 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 User Agent Lookup API and Vector Express v2.0 need an API key?

Neither needs a paid key — User Agent Lookup API is callable with no signup, and Vector Express v2.0 is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call User Agent Lookup API and Vector Express v2.0 from the browser?

Neither sends browser-friendly CORS headers reliably, so call User Agent Lookup API and Vector Express v2.0 from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are User Agent Lookup API and Vector Express v2.0 free for commercial use?

User Agent Lookup API 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.