jsDelivr vs User Agent Lookup API
Same instrument, two spec sheets — measured, not claimed.
jsDelivr vs User Agent Lookup API: common questions
Which is more reliable, jsDelivr or User Agent Lookup API?
Both are neck-and-neck — jsDelivr 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, jsDelivr or User Agent Lookup API?
jsDelivr has the lower median latency in our checks — jsDelivr responds in 181 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 jsDelivr and User Agent Lookup API need an API key?
Neither needs a paid key — jsDelivr 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 jsDelivr and User Agent Lookup API from the browser?
Only jsDelivr 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 jsDelivr and User Agent Lookup API free for commercial use?
jsDelivr 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.