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DownStatus vs MailboxValidator Free Email Checker

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

APIDownStatusDEAD0MailboxValidator Free Email CheckerHEALTHY96
Uptime · 30d
Uptime · 90d19.1%99.44%
Uptime · 30d0.0%98.3%
P50 · ms458248
P95 · ms10701138
AuthnoneapiKey
CORSnono
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 19.1% versus MailboxValidator Free Email Checker at 99.44% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, DownStatus or MailboxValidator Free Email Checker?

MailboxValidator Free Email Checker has the lower median latency in our checks — DownStatus responds in 458 ms versus MailboxValidator Free Email Checker at 248 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 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?

Neither sends browser-friendly CORS headers reliably, so call DownStatus and MailboxValidator Free Email Checker from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

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.