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The Calendar vs Vonage (Nexmo) API

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

APIThe CalendarNEW—Vonage (Nexmo) APINEW—
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)10, 120;w=60;name="crd|generic_key^nexmo-gloo.sanity-service-remote-address-120-rpm|remote_address", 10;w=1;name="crd|generic_key^nexmo-gloo.sanity-service-remote-address-10-rps|remote_address" req/window · 9 remaining · resets 1
In directory since2026-07-052026-07-05
operationalpartialdownno data

The Calendar vs Vonage (Nexmo) API: common questions

Which is more reliable, The Calendar or Vonage (Nexmo) API?

On our scheduled checks, Vonage (Nexmo) API leads on measured uptime — The Calendar at —% versus Vonage (Nexmo) API 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 Vonage (Nexmo) API need an API key?

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

Can I call The Calendar and Vonage (Nexmo) API from the browser?

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

Are The Calendar and Vonage (Nexmo) API free for commercial use?

The Calendar has unclear commercial terms, and Vonage (Nexmo) API 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.