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The Calendar vs Zoom

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

APIThe CalendarNEW—ZoomNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (US federal list per 5 U.S.C. § 6103)Unverified
Free tierFree, no auth (per site)Free tier — API key required
Rate limitNone stated (site advertises no rate limit)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

The Calendar vs Zoom: common questions

Which is more reliable, The Calendar or Zoom?

On our scheduled checks, Zoom leads on measured uptime — The Calendar at —% versus Zoom 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 The Calendar and Zoom need an API key?

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

Can I call The Calendar and Zoom from the browser?

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

Are The Calendar and Zoom free for commercial use?

The Calendar has unclear commercial terms, and Zoom 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.