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OpenHolidays API vs Tumblr

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

APIOpenHolidays APIHEALTHY94TumblrREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms533208
P95 · ms39201101
Authnoneoauth
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedOAuth — some read routes may be public
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenHolidays API vs Tumblr: common questions

Which is more reliable, OpenHolidays API or Tumblr?

Both are neck-and-neck — OpenHolidays API and Tumblr each measure 100% 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, OpenHolidays API or Tumblr?

Tumblr has the lower median latency in our checks — OpenHolidays API responds in 533 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 OpenHolidays API and Tumblr need an API key?

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

Can I call OpenHolidays API and Tumblr from the browser?

Yes — both OpenHolidays API 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 OpenHolidays API and Tumblr free for commercial use?

OpenHolidays API 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.