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MailboxValidator Free Email Checker vs Setup Gear Guide API

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

APIMailboxValidator Free Email CheckerHEALTHY94Setup Gear Guide APIHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms527150
P95 · ms1138521
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs Setup Gear Guide API: common questions

Which is more reliable, MailboxValidator Free Email Checker or Setup Gear Guide API?

Both are neck-and-neck — MailboxValidator Free Email Checker and Setup Gear Guide API 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, MailboxValidator Free Email Checker or Setup Gear Guide API?

Setup Gear Guide API has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 527 ms versus Setup Gear Guide API at 150 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 Setup Gear Guide API need an API key?

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

Can I call MailboxValidator Free Email Checker and Setup Gear Guide API from the browser?

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

Are MailboxValidator Free Email Checker and Setup Gear Guide API free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and Setup Gear Guide API 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.