SampleAPIs vs Userstack
Same instrument, two spec sheets — measured, not claimed.
SampleAPIs vs Userstack: common questions
Which is more reliable, SampleAPIs or Userstack?
On our scheduled checks, SampleAPIs leads on measured uptime — SampleAPIs 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, SampleAPIs or Userstack?
Userstack has the lower median latency in our checks — SampleAPIs responds in 471 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 SampleAPIs and Userstack need an API key?
SampleAPIs needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for SampleAPIs first.
Can I call SampleAPIs and Userstack from the browser?
Yes — both SampleAPIs 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 SampleAPIs and Userstack free for commercial use?
SampleAPIs 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.