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User Agent Lookup API vs YADG

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

APIUser Agent Lookup APINEW—YADGNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

User Agent Lookup API vs YADG: common questions

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

On our scheduled checks, YADG leads on measured uptime — User Agent Lookup API at —% versus YADG 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 YADG need an API key?

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

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

Neither sends browser-friendly CORS headers reliably, so call User Agent Lookup API and YADG 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 YADG free for commercial use?

User Agent Lookup API has unclear commercial terms, and YADG 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.