Packagist vs Userstack
Same instrument, two spec sheets — measured, not claimed.
Packagist vs Userstack: common questions
Which is more reliable, Packagist or Userstack?
On our scheduled checks, Packagist leads on measured uptime — Packagist 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, Packagist or Userstack?
Packagist has the lower median latency in our checks — Packagist responds in 61 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 Packagist and Userstack need an API key?
Packagist needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for Packagist first.
Can I call Packagist and Userstack from the browser?
Only Userstack is browser-friendly — it returns CORS headers over HTTPS. Packagist needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Packagist and Userstack free for commercial use?
Packagist 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.