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mailboxlayer vs MailCheck.ai

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

APImailboxlayerNEW—MailCheck.aiNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublished5 req/window · 4 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

mailboxlayer vs MailCheck.ai: common questions

Which is more reliable, mailboxlayer or MailCheck.ai?

On our scheduled checks, MailCheck.ai leads on measured uptime — mailboxlayer at —% versus MailCheck.ai at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do mailboxlayer and MailCheck.ai need an API key?

MailCheck.ai needs no key, while mailboxlayer requires a free API key. If you want to start calling without signup, reach for MailCheck.ai first.

Can I call mailboxlayer and MailCheck.ai from the browser?

Only MailCheck.ai is browser-friendly — it returns CORS headers over HTTPS. mailboxlayer needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are mailboxlayer and MailCheck.ai free for commercial use?

mailboxlayer has unclear commercial terms, and MailCheck.ai 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.