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QuickChart vs Sheetsu

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

APIQuickChartNEW—SheetsuNEW—
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 — key may be required
Rate limitUnpublished90 req/window · 89 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

QuickChart vs Sheetsu: common questions

Which is more reliable, QuickChart or Sheetsu?

On our scheduled checks, Sheetsu leads on measured uptime — QuickChart at —% versus Sheetsu 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 QuickChart and Sheetsu need an API key?

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

Can I call QuickChart and Sheetsu from the browser?

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

Are QuickChart and Sheetsu free for commercial use?

QuickChart has unclear commercial terms, and Sheetsu 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.