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Bufferapp vs MailCheck.ai

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

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

Bufferapp vs MailCheck.ai: common questions

Which is more reliable, Bufferapp or MailCheck.ai?

On our scheduled checks, MailCheck.ai leads on measured uptime — Bufferapp 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 Bufferapp and MailCheck.ai need an API key?

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

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

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

Are Bufferapp and MailCheck.ai free for commercial use?

Bufferapp 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.