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Azure DevOps vs Userstack

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

APIAzure DevOpsNEW—UserstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Azure DevOps vs Userstack: common questions

Which is more reliable, Azure DevOps or Userstack?

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

Both ask you to authenticate — Azure DevOps 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 Azure DevOps and Userstack from the browser?

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

Are Azure DevOps and Userstack free for commercial use?

Azure DevOps 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.