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Adoptium vs MailboxValidator Free Email Checker

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

APIAdoptiumHEALTHY95MailboxValidator Free Email CheckerHEALTHY96
Uptime · 30d
Uptime · 90d100%99.44%
Uptime · 30d100%98.3%
P50 · ms333248
P95 · ms12551138
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Adoptium vs MailboxValidator Free Email Checker: common questions

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

On our scheduled checks, Adoptium leads on measured uptime — Adoptium at 100% 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, Adoptium or MailboxValidator Free Email Checker?

MailboxValidator Free Email Checker has the lower median latency in our checks — Adoptium responds in 333 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 Adoptium and MailboxValidator Free Email Checker need an API key?

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

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

Only Adoptium 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 Adoptium and MailboxValidator Free Email Checker free for commercial use?

Adoptium 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.