ddownload vs Userstack
Same instrument, two spec sheets — measured, not claimed.
ddownload vs Userstack: common questions
Which is more reliable, ddownload or Userstack?
On our scheduled checks, ddownload leads on measured uptime — ddownload 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, ddownload or Userstack?
ddownload has the lower median latency in our checks — ddownload responds in 365 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 ddownload and Userstack need an API key?
Both ask you to authenticate — ddownload 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 ddownload and Userstack from the browser?
Only Userstack is browser-friendly — it returns CORS headers over HTTPS. ddownload needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are ddownload and Userstack free for commercial use?
ddownload 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.