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Abstract API vs User Agent Lookup API

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

APIAbstract APIHEALTHY89User Agent Lookup APIHEALTHY96
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d98.3%100%
P50 · ms700426
P95 · ms1656764
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract API vs User Agent Lookup API: common questions

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

On our scheduled checks, User Agent Lookup API leads on measured uptime — Abstract API at 99.02% versus User Agent Lookup 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, Abstract API or User Agent Lookup API?

User Agent Lookup API has the lower median latency in our checks — Abstract API responds in 700 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 Abstract API and User Agent Lookup API need an API key?

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

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

Only Abstract API 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 Abstract API and User Agent Lookup API free for commercial use?

Abstract API 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.