ip-api.com vs Userstack
Same instrument, two spec sheets — measured, not claimed.
ip-api.com vs Userstack: common questions
Which is more reliable, ip-api.com or Userstack?
Both are neck-and-neck — ip-api.com and Userstack each measure 99.02% 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, ip-api.com or Userstack?
ip-api.com has the lower median latency in our checks — ip-api.com responds in 33 ms versus Userstack at 443 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 ip-api.com and Userstack need an API key?
ip-api.com needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for ip-api.com first.
Can I call ip-api.com and Userstack from the browser?
Only Userstack is browser-friendly — it returns CORS headers over HTTPS. ip-api.com needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are ip-api.com and Userstack free for commercial use?
ip-api.com has unclear commercial terms, and Userstack 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.