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caldays vs Vonage (Nexmo) API

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

APIcaldaysHEALTHY99Vonage (Nexmo) APIHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms149507
P95 · ms6751019
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublished10, 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

caldays vs Vonage (Nexmo) API: common questions

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

Both are neck-and-neck — caldays 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, caldays or Vonage (Nexmo) API?

caldays has the lower median latency in our checks — caldays responds in 149 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 caldays and Vonage (Nexmo) API need an API key?

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

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

Only caldays 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 caldays and Vonage (Nexmo) API free for commercial use?

caldays 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.