US Autocomplete vs User Agent Lookup API
Same instrument, two spec sheets — measured, not claimed.
US Autocomplete vs User Agent Lookup API: common questions
Which is more reliable, US Autocomplete or User Agent Lookup API?
On our scheduled checks, User Agent Lookup API leads on measured uptime — US Autocomplete 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, US Autocomplete or User Agent Lookup API?
User Agent Lookup API has the lower median latency in our checks — US Autocomplete responds in 683 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 US Autocomplete and User Agent Lookup API need an API key?
User Agent Lookup API needs no key, while US Autocomplete requires a free API key. If you want to start calling without signup, reach for User Agent Lookup API first.
Can I call US Autocomplete and User Agent Lookup API from the browser?
Only US Autocomplete 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 US Autocomplete and User Agent Lookup API free for commercial use?
US Autocomplete 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.