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ReqRes vs Userstack

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

APIReqResNEW—UserstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ReqRes vs Userstack: common questions

Which is more reliable, ReqRes or Userstack?

On our scheduled checks, Userstack leads on measured uptime — ReqRes 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 ReqRes and Userstack need an API key?

ReqRes needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for ReqRes first.

Can I call ReqRes and Userstack from the browser?

Only Userstack is browser-friendly — it returns CORS headers over HTTPS. ReqRes needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ReqRes and Userstack free for commercial use?

ReqRes 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.