API archive entry · source-reported
CountdownsHQ
Dates and timezone-correct countdowns for 150+ holidays and observances in 18 countries
Other Calendar APIs
These records share a directory category and are ordered by similarity of reported access facts. They are a shortlist, not proof of drop-in compatibility.
Intellibook
Appointment booking and availability API for salons and clinics
No auth · HTTPS reported · CORS Yes
India Public Holidays
Official Indian public holidays for the Central government and 36 states/UTs
No auth · HTTPS reported · CORS Yes
Nager.Date
Public holidays for more than 200 countries
No auth · HTTPS reported · CORS Yes
OpenHolidays API
Public and school holidays for many countries via an open REST API
No auth · HTTPS reported · CORS Yes
caldays
Public holidays for 195+ countries
No auth · HTTPS reported · CORS Yes
Namedays Calendar
Provides namedays for multiple countries
No auth · HTTPS reported · CORS Yes
How to compare them
Coverage
Compare exact endpoints, fields, geography, history, and update frequency.
Operating cost
Model request volume, caching, overages, support, and migration cost.
Integration risk
Test auth, errors, pagination, latency, versioning, and outage behavior.
Data rights
Review attribution, redistribution, retention, privacy, and commercial-use terms.
Source reference
This page separates source-reported facts from questions that need live provider verification.