API archive entry · source-reported
Google Calendar
Display, create and modify Google calendar events
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.
Calendarific
Worldwide Holidays
API key · HTTPS reported · CORS Unknown
Checkiday - National Holiday
Industry-leading holiday data with over 5,000 holidays and thousands of descriptions
API key · HTTPS reported · CORS Unknown
Holidays
Historical data regarding holidays
API key · HTTPS reported · CORS Unknown
Non-Working Days
Database of ICS files for non working days
No auth · HTTPS reported · CORS Unknown
UK Bank Holidays
Bank holidays in England and Wales, Scotland and Northern Ireland
No auth · HTTPS reported · CORS Unknown
caldays
Public holidays for 195+ countries
No auth · HTTPS reported · CORS Yes
How to compare them
Coverage
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Operating cost
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Integration risk
Test auth, errors, pagination, latency, versioning, and outage behavior.
Data rights
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Source reference
This page separates source-reported facts from questions that need live provider verification.