Mockaroo vs Userstack
Same instrument, two spec sheets — measured, not claimed.
Mockaroo vs Userstack: common questions
Which is more reliable, Mockaroo or Userstack?
On our scheduled checks, Mockaroo leads on measured uptime — Mockaroo 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, Mockaroo or Userstack?
Userstack has the lower median latency in our checks — Mockaroo responds in 529 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 Mockaroo and Userstack need an API key?
Both ask you to authenticate — Mockaroo uses an API key and Userstack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call Mockaroo and Userstack from the browser?
Yes — both Mockaroo 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 Mockaroo and Userstack free for commercial use?
Mockaroo 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.