Poptin API vs Userstack
Same instrument, two spec sheets — measured, not claimed.
Poptin API vs Userstack: common questions
Which is more reliable, Poptin API or Userstack?
On our scheduled checks, Poptin API leads on measured uptime — Poptin API at 100% 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, Poptin API or Userstack?
Userstack has the lower median latency in our checks — Poptin API responds in 698 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 Poptin API and Userstack need an API key?
Both ask you to authenticate — Poptin API 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 Poptin API and Userstack from the browser?
Yes — both Poptin API 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 Poptin API and Userstack free for commercial use?
Poptin API 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.