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MailboxValidator Free Email Checker vs No-as-a-Service

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

APIMailboxValidator Free Email CheckerNEW—No-as-a-ServiceNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs No-as-a-Service: common questions

Which is more reliable, MailboxValidator Free Email Checker or No-as-a-Service?

On our scheduled checks, No-as-a-Service leads on measured uptime — MailboxValidator Free Email Checker at —% versus No-as-a-Service 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 MailboxValidator Free Email Checker and No-as-a-Service need an API key?

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

Can I call MailboxValidator Free Email Checker and No-as-a-Service from the browser?

Only No-as-a-Service 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 MailboxValidator Free Email Checker and No-as-a-Service free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and No-as-a-Service 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.