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Gcore CDN vs MailboxValidator Free Email Checker

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

APIGcore CDNHEALTHY96MailboxValidator Free Email CheckerHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms362527
P95 · ms12211138
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Gcore CDN vs MailboxValidator Free Email Checker: common questions

Which is more reliable, Gcore CDN or MailboxValidator Free Email Checker?

Both are neck-and-neck — Gcore CDN and MailboxValidator Free Email Checker each measure 100% 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, Gcore CDN or MailboxValidator Free Email Checker?

Gcore CDN has the lower median latency in our checks — Gcore CDN responds in 362 ms versus MailboxValidator Free Email Checker at 527 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 Gcore CDN and MailboxValidator Free Email Checker need an API key?

Both ask you to authenticate — Gcore CDN uses an API key and MailboxValidator Free Email Checker 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 Gcore CDN and MailboxValidator Free Email Checker from the browser?

Only Gcore CDN 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 Gcore CDN and MailboxValidator Free Email Checker free for commercial use?

Gcore CDN 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.