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DownStatus vs MailboxValidator Free Email Checker

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

APIDownStatusNEW—MailboxValidator Free Email CheckerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no API key (per docs)Free tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

DownStatus vs MailboxValidator Free Email Checker: common questions

Which is more reliable, DownStatus or MailboxValidator Free Email Checker?

On our scheduled checks, MailboxValidator Free Email Checker leads on measured uptime — DownStatus at —% versus MailboxValidator Free Email Checker 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 DownStatus and MailboxValidator Free Email Checker need an API key?

DownStatus needs no key, while MailboxValidator Free Email Checker requires a free API key. If you want to start calling without signup, reach for DownStatus first.

Can I call DownStatus and MailboxValidator Free Email Checker from the browser?

Only DownStatus is browser-friendly — it returns CORS headers over HTTPS. MailboxValidator Free Email Checker needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are DownStatus and MailboxValidator Free Email Checker free for commercial use?

DownStatus has unclear commercial terms, and MailboxValidator Free Email Checker 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.