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Nexmo API vs Slack

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

APINexmo APIHEALTHY93SlackHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms567324
P95 · ms1221808
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limit10, 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 1Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Nexmo API vs Slack: common questions

Which is more reliable, Nexmo API or Slack?

Both are neck-and-neck — Nexmo API and Slack 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, Nexmo API or Slack?

Slack has the lower median latency in our checks — Nexmo API responds in 567 ms versus Slack at 324 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 Nexmo API and Slack need an API key?

Both ask you to authenticate — Nexmo API uses an API key and Slack uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call Nexmo API and Slack from the browser?

Only Slack 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 Nexmo API and Slack free for commercial use?

Nexmo API has unclear commercial terms, and Slack 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.