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APIs.guru vs User Agent Lookup API

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

APIAPIs.guruHEALTHY97User Agent Lookup APIHEALTHY96
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms266426
P95 · ms1421764
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree and open, no keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

APIs.guru vs User Agent Lookup API: common questions

Which is more reliable, APIs.guru or User Agent Lookup API?

Both are neck-and-neck — APIs.guru 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, APIs.guru or User Agent Lookup API?

APIs.guru has the lower median latency in our checks — APIs.guru responds in 266 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 APIs.guru and User Agent Lookup API need an API key?

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

Can I call APIs.guru and User Agent Lookup API from the browser?

Only APIs.guru 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 APIs.guru and User Agent Lookup API free for commercial use?

APIs.guru 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.