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caldays vs Nexmo API

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

APIcaldaysHEALTHY99Nexmo APIHEALTHY93
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms149567
P95 · ms6751221
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 Nexmo API: common questions

Which is more reliable, caldays or Nexmo API?

Both are neck-and-neck — caldays and 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 Nexmo API?

caldays has the lower median latency in our checks — caldays responds in 149 ms versus Nexmo API at 567 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 Nexmo API need an API key?

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

Can I call caldays and Nexmo API from the browser?

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

Are caldays and Nexmo API free for commercial use?

caldays has unclear commercial terms, and 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.