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QuickChart vs ReqRes

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

APIQuickChartNEW—ReqResNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
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

QuickChart vs ReqRes: common questions

Which is more reliable, QuickChart or ReqRes?

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

Neither needs a paid key — QuickChart is callable with no signup, and ReqRes is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call QuickChart and ReqRes from the browser?

Neither sends browser-friendly CORS headers reliably, so call QuickChart and ReqRes from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are QuickChart and ReqRes free for commercial use?

QuickChart has unclear commercial terms, and ReqRes 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.