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MailboxValidator Free Email Checker vs UUID Generator

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

APIMailboxValidator Free Email CheckerHEALTHY96UUID GeneratorHEALTHY99
Uptime · 30d
Uptime · 90d99.44%100%
Uptime · 30d98.3%100%
P50 · ms248137
P95 · ms1138837
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublished60 req/window · 59 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs UUID Generator: common questions

Which is more reliable, MailboxValidator Free Email Checker or UUID Generator?

On our scheduled checks, UUID Generator leads on measured uptime — MailboxValidator Free Email Checker at 99.44% versus UUID Generator at 100% 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, MailboxValidator Free Email Checker or UUID Generator?

UUID Generator has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 248 ms versus UUID Generator at 137 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 MailboxValidator Free Email Checker and UUID Generator need an API key?

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

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

Only UUID Generator 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 UUID Generator free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and UUID Generator 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.