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SampleAPIs vs Userstack

Same instrument, two spec sheets — measured, not claimed.

APISampleAPIsNEW—UserstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit5000 req/window · 3876 remaining · resets 1783516346Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

SampleAPIs vs Userstack: common questions

Which is more reliable, SampleAPIs or Userstack?

On our scheduled checks, Userstack leads on measured uptime — SampleAPIs at —% versus Userstack at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

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.