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Emailvalidation vs Slack

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

APIEmailvalidationNEW—SlackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Emailvalidation vs Slack: common questions

Which is more reliable, Emailvalidation or Slack?

On our scheduled checks, Slack leads on measured uptime — Emailvalidation at —% versus Slack 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 Emailvalidation and Slack need an API key?

Both ask you to authenticate — Emailvalidation 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 Emailvalidation and Slack from the browser?

Yes — both Emailvalidation and Slack send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Emailvalidation and Slack free for commercial use?

Emailvalidation 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.