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ddownload vs MailboxValidator Free Email Checker

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

APIddownloadREACHABLE100MailboxValidator Free Email CheckerHEALTHY96
Uptime · 30d
Uptime · 90d100%99.44%
Uptime · 30d100%98.3%
P50 · ms117248
P95 · ms7921138
AuthapiKeyapiKey
CORSnono
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

ddownload vs MailboxValidator Free Email Checker: common questions

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

On our scheduled checks, ddownload leads on measured uptime — ddownload 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, ddownload or MailboxValidator Free Email Checker?

ddownload has the lower median latency in our checks — ddownload responds in 117 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 ddownload and MailboxValidator Free Email Checker need an API key?

Both ask you to authenticate — ddownload 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 ddownload and MailboxValidator Free Email Checker from the browser?

Neither sends browser-friendly CORS headers reliably, so call ddownload and MailboxValidator Free Email Checker from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are ddownload and MailboxValidator Free Email Checker free for commercial use?

ddownload 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.