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MailCheck.ai vs Tumblr

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

APIMailCheck.aiHEALTHY93TumblrREACHABLE100
Uptime · 30d
Uptime · 90d93.1%100%
Uptime · 30d93.3%100%
P50 · ms272208
P95 · ms8421101
Authnoneoauth
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedOAuth — some read routes may be public
Rate limit5 req/window · 4 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailCheck.ai vs Tumblr: common questions

Which is more reliable, MailCheck.ai or Tumblr?

On our scheduled checks, Tumblr leads on measured uptime — MailCheck.ai at 93.1% versus Tumblr at 100% 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, MailCheck.ai or Tumblr?

Tumblr has the lower median latency in our checks — MailCheck.ai responds in 272 ms versus Tumblr at 208 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 MailCheck.ai and Tumblr need an API key?

MailCheck.ai needs no key, while Tumblr requires OAuth. If you want to start calling without signup, reach for MailCheck.ai first.

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

Yes — both MailCheck.ai and Tumblr 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 MailCheck.ai and Tumblr free for commercial use?

MailCheck.ai has unclear commercial terms, and Tumblr 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.