OpenQR vs Userstack
Same instrument, two spec sheets — measured, not claimed.
OpenQR vs Userstack: common questions
Which is more reliable, OpenQR or Userstack?
On our scheduled checks, OpenQR leads on measured uptime — OpenQR 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, OpenQR or Userstack?
Userstack has the lower median latency in our checks — OpenQR responds in 1125 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 OpenQR and Userstack need an API key?
Both ask you to authenticate — OpenQR 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 OpenQR and Userstack from the browser?
Yes — both OpenQR 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 OpenQR and Userstack free for commercial use?
OpenQR 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.