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Church Calendar vs OpenHolidays API

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

APIChurch CalendarNEW—OpenHolidays APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSnoyes
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

Church Calendar vs OpenHolidays API: common questions

Which is more reliable, Church Calendar or OpenHolidays API?

On our scheduled checks, OpenHolidays API leads on measured uptime — Church Calendar at —% versus OpenHolidays API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Church Calendar and OpenHolidays API need an API key?

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

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

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

Are Church Calendar and OpenHolidays API free for commercial use?

Church Calendar has unclear commercial terms, and OpenHolidays API 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.