RandomUser vs Userstack
Same instrument, two spec sheets — measured, not claimed.
RandomUser vs Userstack: common questions
Which is more reliable, RandomUser or Userstack?
On our scheduled checks, RandomUser leads on measured uptime — RandomUser at 100% versus Userstack at 99.02% 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, RandomUser or Userstack?
RandomUser has the lower median latency in our checks — RandomUser responds in 210 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 RandomUser and Userstack need an API key?
RandomUser needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for RandomUser first.
Can I call RandomUser and Userstack from the browser?
Yes — both RandomUser and Userstack send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are RandomUser and Userstack free for commercial use?
RandomUser 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.