Userstack vs Yes No
Same instrument, two spec sheets — measured, not claimed.
Userstack vs Yes No: common questions
Which is more reliable, Userstack or Yes No?
On our scheduled checks, Yes No leads on measured uptime — Userstack at 99.02% versus Yes No at 100% 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, Userstack or Yes No?
Userstack has the lower median latency in our checks — Userstack responds in 443 ms versus Yes No at 692 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 Userstack and Yes No need an API key?
Yes No needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for Yes No first.
Can I call Userstack and Yes No from the browser?
Yes — both Userstack and Yes No 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 Userstack and Yes No free for commercial use?
Userstack has unclear commercial terms, and Yes No 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.