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Image-Charts vs SLA Uptime Calculator

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

APIImage-ChartsNEW—SLA Uptime CalculatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Image-Charts vs SLA Uptime Calculator: common questions

Which is more reliable, Image-Charts or SLA Uptime Calculator?

On our scheduled checks, SLA Uptime Calculator leads on measured uptime — Image-Charts at —% versus SLA Uptime Calculator 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 SLA Uptime Calculator need an API key?

Neither needs a paid key — Image-Charts is callable with no signup, and SLA Uptime Calculator is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Image-Charts and SLA Uptime Calculator from the browser?

Only SLA Uptime Calculator 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 SLA Uptime Calculator free for commercial use?

Image-Charts has unclear commercial terms, and SLA Uptime Calculator 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.