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Image-Charts vs Userstack

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

APIImage-ChartsNEW—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

Image-Charts vs Userstack: common questions

Which is more reliable, Image-Charts or Userstack?

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

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

Can I call Image-Charts and Userstack from the browser?

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

Are Image-Charts and Userstack free for commercial use?

Image-Charts 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.