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Catherine Shulman's Quotes vs Zen Quotes

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

APICatherine Shulman's QuotesHEALTHY91Zen QuotesHEALTHY74
Uptime · 30d
Uptime · 90d100%90.2%
Uptime · 30d100%86.7%
P50 · ms6381657
P95 · ms20674714
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, Catherine Shulman's Quotes leads on measured uptime — Catherine Shulman's Quotes at 100% versus Zen Quotes at 90.2% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Catherine Shulman's Quotes or Zen Quotes?

Catherine Shulman's Quotes has the lower median latency in our checks — Catherine Shulman's Quotes responds in 638 ms versus Zen Quotes at 1657 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.