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OpenQR vs User Agent Lookup API

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

APIOpenQRHEALTHY80User Agent Lookup APIHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1125426
P95 · ms2851764
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenQR vs User Agent Lookup API: common questions

Which is more reliable, OpenQR or User Agent Lookup API?

Both are neck-and-neck — OpenQR and User Agent Lookup API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, OpenQR or User Agent Lookup API?

User Agent Lookup API has the lower median latency in our checks — OpenQR responds in 1125 ms versus User Agent Lookup API at 426 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 OpenQR and User Agent Lookup API need an API key?

User Agent Lookup API needs no key, while OpenQR requires a free API key. If you want to start calling without signup, reach for User Agent Lookup API first.

Can I call OpenQR and User Agent Lookup API from the browser?

Only OpenQR is browser-friendly — it returns CORS headers over HTTPS. User Agent Lookup API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are OpenQR and User Agent Lookup API free for commercial use?

OpenQR has unclear commercial terms, and User Agent Lookup 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.