ParlayAPI vs Userstack
Same instrument, two spec sheets — measured, not claimed.
ParlayAPI vs Userstack: common questions
Which is more reliable, ParlayAPI or Userstack?
On our scheduled checks, Userstack leads on measured uptime — ParlayAPI at 87.5% versus Userstack at 99.44% 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, ParlayAPI or Userstack?
ParlayAPI has the lower median latency in our checks — ParlayAPI responds in 211 ms versus Userstack at 266 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 ParlayAPI and Userstack need an API key?
Both ask you to authenticate — ParlayAPI 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 ParlayAPI and Userstack from the browser?
Only Userstack is browser-friendly — it returns CORS headers over HTTPS. ParlayAPI needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are ParlayAPI and Userstack free for commercial use?
ParlayAPI 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.