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MailCheck.ai vs Nager.Date

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

APIMailCheck.aiNEW—Nager.DateNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree, no key
Rate limit5 req/window · 4 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailCheck.ai vs Nager.Date: common questions

Which is more reliable, MailCheck.ai or Nager.Date?

On our scheduled checks, Nager.Date leads on measured uptime — MailCheck.ai at —% versus Nager.Date 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 MailCheck.ai and Nager.Date need an API key?

Neither needs a paid key — MailCheck.ai is callable with no signup, and Nager.Date is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call MailCheck.ai and Nager.Date from the browser?

Yes — both MailCheck.ai and Nager.Date 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 MailCheck.ai and Nager.Date free for commercial use?

MailCheck.ai has unclear commercial terms, and Nager.Date 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.