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Namedays Calendar vs Tumblr

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

APINamedays CalendarDYING88TumblrREACHABLE100
Uptime · 30d
Uptime · 90d91.2%100%
Uptime · 30d85.0%100%
P50 · ms480208
P95 · ms27491101
Authnoneoauth
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedOAuth — some read routes may be public
Rate limit60 req/window · 58 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Namedays Calendar vs Tumblr: common questions

Which is more reliable, Namedays Calendar or Tumblr?

On our scheduled checks, Tumblr leads on measured uptime — Namedays Calendar at 91.2% 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, Namedays Calendar or Tumblr?

Tumblr has the lower median latency in our checks — Namedays Calendar responds in 480 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 Namedays Calendar and Tumblr need an API key?

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

Can I call Namedays Calendar and Tumblr from the browser?

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

Are Namedays Calendar and Tumblr free for commercial use?

Namedays Calendar 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.