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Disify vs MailCheck.ai

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

APIDisifyDYING38MailCheck.aiHEALTHY93
Uptime · 30d
Uptime · 90d42.2%93.1%
Uptime · 30d28.3%93.3%
P50 · ms1075272
P95 · ms1679842
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit30 req/window · 21 remaining5 req/window · 4 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Disify vs MailCheck.ai: common questions

Which is more reliable, Disify or MailCheck.ai?

On our scheduled checks, MailCheck.ai leads on measured uptime — Disify at 42.2% versus MailCheck.ai at 93.1% 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, Disify or MailCheck.ai?

MailCheck.ai has the lower median latency in our checks — Disify responds in 1075 ms versus MailCheck.ai at 272 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 Disify and MailCheck.ai need an API key?

Neither needs a paid key — Disify is callable with no signup, and MailCheck.ai is callable with no signup. Both are quick to prototype with; rate limits still apply.

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

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

Are Disify and MailCheck.ai free for commercial use?

Disify 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.