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OpenHolidays API vs Namedays Calendar

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

APIOpenHolidays APIUNMONITORED—Namedays CalendarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenHolidays API vs Namedays Calendar: common questions

Which is more reliable, OpenHolidays API or Namedays Calendar?

Only Namedays Calendar is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do OpenHolidays API and Namedays Calendar need an API key?

Neither needs a paid key — OpenHolidays API is callable with no signup, and Namedays Calendar is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call OpenHolidays API and Namedays Calendar from the browser?

Yes — both OpenHolidays API and Namedays Calendar 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 Namedays Calendar free for commercial use?

OpenHolidays API has unclear commercial terms, and Namedays Calendar 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.