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The Calendar vs Vonage (Nexmo) API

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

APIThe CalendarHEALTHY90Vonage (Nexmo) APIHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms588507
P95 · ms35501019
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?

Both are neck-and-neck — The Calendar and Vonage (Nexmo) API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

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

Vonage (Nexmo) API has the lower median latency in our checks — The Calendar responds in 588 ms versus Vonage (Nexmo) API at 507 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 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.