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MailboxValidator Free Email Checker vs Sheet2API

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

APIMailboxValidator Free Email CheckerHEALTHY94Sheet2APIHEALTHY79
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms5273070
P95 · ms11384902
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs Sheet2API: common questions

Which is more reliable, MailboxValidator Free Email Checker or Sheet2API?

On our scheduled checks, MailboxValidator Free Email Checker leads on measured uptime — MailboxValidator Free Email Checker at 100% versus Sheet2API at 99.02% 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 Sheet2API?

MailboxValidator Free Email Checker has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 527 ms versus Sheet2API at 3070 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 Sheet2API need an API key?

Both ask you to authenticate — MailboxValidator Free Email Checker uses an API key and Sheet2API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call MailboxValidator Free Email Checker and Sheet2API from the browser?

Only Sheet2API 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 Sheet2API free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and Sheet2API 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.