API archive entry · source-reported
Intellibook
Appointment booking and availability API for salons and clinics
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.
CountdownsHQ
Dates and timezone-correct countdowns for 150+ holidays and observances in 18 countries
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
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Operating cost
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Integration risk
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Data rights
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Source reference
This page separates source-reported facts from questions that need live provider verification.