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Lobsters vs MailCheck.ai

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

APILobstersHEALTHY97MailCheck.aiHEALTHY93
Uptime · 30d
Uptime · 90d100%93.1%
Uptime · 30d100%93.3%
P50 · ms243272
P95 · ms1175842
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublished5 req/window · 4 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Lobsters vs MailCheck.ai: common questions

Which is more reliable, Lobsters or MailCheck.ai?

On our scheduled checks, Lobsters leads on measured uptime — Lobsters at 100% 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, Lobsters or MailCheck.ai?

Lobsters has the lower median latency in our checks — Lobsters responds in 243 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 Lobsters and MailCheck.ai need an API key?

Neither needs a paid key — Lobsters 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 Lobsters and MailCheck.ai from the browser?

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

Are Lobsters and MailCheck.ai free for commercial use?

Lobsters 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.