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CloudConvert vs MailboxValidator Free Email Checker

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

APICloudConvertHEALTHY96MailboxValidator Free Email CheckerHEALTHY94
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms433527
P95 · ms10191138
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CloudConvert vs MailboxValidator Free Email Checker: common questions

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

Both are neck-and-neck — CloudConvert 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, CloudConvert or MailboxValidator Free Email Checker?

CloudConvert has the lower median latency in our checks — CloudConvert responds in 433 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 CloudConvert and MailboxValidator Free Email Checker need an API key?

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

Neither sends browser-friendly CORS headers reliably, so call CloudConvert 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 CloudConvert and MailboxValidator Free Email Checker free for commercial use?

CloudConvert 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.