Byabbe
Calendar
Seach histories from wikipedia for a particular day
No keyCORSHTTPS
Free Calendar APIs
Free public APIs for calendar, each one verified and kept up to date.
26 listed · 18 need no key · 9 work in the browser
caldays
Calendar
Public holidays for 195+ countries
No keyCORSHTTPS
The Calendar
Calendar
Public holidays for US states and 30 countries plus sports and finance calendars as static JSON
No keyCORSHTTPS
TimeZones iCal Library
Calendar
Database of official time zones and corresponding iCal VTIMEZONE blocks
No keyCORSHTTPS
UK Bank Holidays
Calendar
Bank holidays in England and Wales, Scotland and Northern Ireland
No keyCORSHTTPS
Church Calendar
Calendar
Catholic liturgical calendar
No key
Czech Namedays Calendar
Calendar
Lookup for a name and returns nameday date
No key
Hebrew Calendar
Calendar
Convert between Gregorian and Hebrew, fetch Shabbat and Holiday times, etc
No key
India Public Holidays
Calendar
Official Indian public holidays for the Central government and 36 states/UTs
No keyCORSHTTPS
Intellibook
Calendar
Appointment booking and availability API for salons and clinics
No keyCORSHTTPS
LectServe
Calendar
Protestant liturgical calendar
No key
Nager.Date
Calendar
Public holidays for more than 90 countries
No keyHTTPS
Nager.Date
Calendar
Public holidays for more than 200 countries
No keyHTTPS
Namedays Calendar
Calendar
Provides namedays for multiple countries
No keyHTTPS
Non-Working Days
Calendar
Simple API for checking working, non-working or short days for Russia, Ukraine, Belarus and Kazakhstan
No keyHTTPS
Non-Working Days
Calendar
Database of ICS files for non working days
No keyHTTPS
OpenHolidays API
Calendar
Public and school holidays for many countries via an open REST API
No keyHTTPS
Russian Calendar
Calendar
Check if a date is a Russian holiday or not
No keyHTTPS
Festivo Public Holidays
Calendar
Fastest and most advanced public holiday and observance service on the market
API keyCORSHTTPS
Holidays
Calendar
Historical data regarding holidays
API keyCORSHTTPS
Calendar Index
Calendar
Worldwide Holidays and Working Days
API keyHTTPS
Calendarific
Calendar
Worldwide Holidays
API keyHTTPS
Checkiday - National Holiday
Calendar
Industry-leading holiday data with over 5,000 holidays and thousands of descriptions
API keyHTTPS
Feriados API
Calendar
Brazilian holidays API covering national, state, and municipal holidays for 5,570+ municipalities
API keyHTTPS
All 26 Calendar APIs
- Byabbe
- caldays
- The Calendar
- TimeZones iCal Library
- UK Bank Holidays
- Church Calendar
- Czech Namedays Calendar
- Hebrew Calendar
- India Public Holidays
- Intellibook
- LectServe
- Nager.Date
- Nager.Date
- Namedays Calendar
- Non-Working Days
- Non-Working Days
- OpenHolidays API
- Russian Calendar
- Festivo Public Holidays
- Holidays
- Calendar Index
- Calendarific
- Checkiday - National Holiday
- Feriados API
- Google Calendar
- Public Holidays
Free Calendar APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free calendar APIs are there?
We track 26 in this category, of which 21 responded at our last check. 18 of them need no API key.
Which calendar APIs work without an API key?
18 of the 26 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these calendar APIs in a browser app?
7 entries in this category need no key and return CORS headers, which is the combination that lets you call them straight from client-side JavaScript. The rest need a server or a proxy in between.
Which is the fastest free calendar API?
Of the keyless options that responded at our last check, UK Bank Holidays was quickest at a median 274 ms. Speed is only one factor — coverage and licensing usually matter more — but it is measured here rather than claimed.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 361 of 3,005 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.