Nager.Date vs Namedays Calendar

Nager.Date is a free, open-source public holiday API covering 204 countries, with endpoints for a year's full holiday list, the next public holiday, whether today is a holiday, and country metadata — all keyless JSON with no rate limiting. It's maintained on GitHub by a single developer and is popular as the default holiday backend baked into several scheduling and HR libraries specifically because it needs no signup. The old v3 endpoints are deprecated; the provider will retire them on 31 January 2027, so new integrations should use v4.

This API looks up which name(s) are celebrated on a given calendar date — or which date a given name falls on — across roughly 40 countries' nameday traditions, via a documented OpenAPI v2 surface (/today, /tomorrow, /yesterday, /getdate) served as JSON. It's a personal open project by its maintainer (Michal Abaline) with no signup, no API key, and no rate limiting, positioned as a lighter keyless alternative to older nameday lookup services.