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OpenHolidays API vs Telegraph

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

APIOpenHolidays APINEW—TelegraphNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenHolidays API vs Telegraph: common questions

Which is more reliable, OpenHolidays API or Telegraph?

On our scheduled checks, Telegraph leads on measured uptime — OpenHolidays API at —% versus Telegraph 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 OpenHolidays API and Telegraph need an API key?

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

Can I call OpenHolidays API and Telegraph from the browser?

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

OpenHolidays API has unclear commercial terms, and Telegraph 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.