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Catherine Shulman's Quotes vs Zen Quotes

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

APICatherine Shulman's QuotesNEW—Zen QuotesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — no key
Rate limitUnpublishedRate-limited on the free tier (see zenquotes.io)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Catherine Shulman's Quotes vs Zen Quotes: common questions

Which is more reliable, Catherine Shulman's Quotes or Zen Quotes?

On our scheduled checks, Zen Quotes leads on measured uptime — Catherine Shulman's Quotes at —% versus Zen Quotes 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 Catherine Shulman's Quotes and Zen Quotes need an API key?

Neither needs a paid key — Catherine Shulman's Quotes is callable with no signup, and Zen Quotes is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Catherine Shulman's Quotes and Zen Quotes from the browser?

Only Catherine Shulman's Quotes is browser-friendly — it returns CORS headers over HTTPS. Zen Quotes needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Catherine Shulman's Quotes and Zen Quotes free for commercial use?

Catherine Shulman's Quotes has unclear commercial terms, and Zen Quotes 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.