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MailboxValidator Free Email Checker vs NetworkCalc

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

APIMailboxValidator Free Email CheckerHEALTHY96NetworkCalcHEALTHY95
Uptime · 30d
Uptime · 90d99.44%99.44%
Uptime · 30d98.3%100%
P50 · ms248289
P95 · ms11383372
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree public API, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs NetworkCalc: common questions

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

Both are neck-and-neck — MailboxValidator Free Email Checker and NetworkCalc each measure 99.44% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, MailboxValidator Free Email Checker or NetworkCalc?

MailboxValidator Free Email Checker has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 248 ms versus NetworkCalc at 289 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 NetworkCalc need an API key?

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

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

Only NetworkCalc 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 NetworkCalc free for commercial use?

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