Nager.Date vs OpenHolidays API
Same instrument, two spec sheets — measured, not claimed.
Nager.Date vs OpenHolidays API: common questions
Which is more reliable, Nager.Date or OpenHolidays API?
Both are neck-and-neck — Nager.Date and OpenHolidays API 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, Nager.Date or OpenHolidays API?
Nager.Date has the lower median latency in our checks — Nager.Date responds in 58 ms versus OpenHolidays API at 533 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 Nager.Date and OpenHolidays API need an API key?
Neither needs a paid key — Nager.Date 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 Nager.Date and OpenHolidays API from the browser?
Yes — both Nager.Date and OpenHolidays API 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 Nager.Date and OpenHolidays API free for commercial use?
Nager.Date 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.