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Arbeitnow vs MailCheck.ai

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

APIArbeitnowHEALTHY68MailCheck.aiHEALTHY93
Uptime · 30d
Uptime · 90d93.1%93.1%
Uptime · 30d90.0%93.3%
P50 · ms303272
P95 · ms4162842
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no key requiredFree — limits not published
Rate limit5 req/window · 4 remaining5 req/window · 4 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

Arbeitnow vs MailCheck.ai: common questions

Which is more reliable, Arbeitnow or MailCheck.ai?

Both are neck-and-neck — Arbeitnow and MailCheck.ai each measure 93.1% 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, Arbeitnow or MailCheck.ai?

MailCheck.ai has the lower median latency in our checks — Arbeitnow responds in 303 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 Arbeitnow and MailCheck.ai need an API key?

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

Yes — both Arbeitnow and MailCheck.ai send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Arbeitnow and MailCheck.ai free for commercial use?

Arbeitnow 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.