Calendar · head-to-head
caldays vs The Calendar
Caldays provides free public holiday data for 206 countries in JSON format, plus long-weekend calculations and a world clock endpoint. Anonymous use is capped at 10,000 requests per day; a metered API key raises the limit for higher-volume needs. The holiday data carries a CC BY 4.0 licence, so users must credit Caldays in their app.
The Calendar publishes pre-generated, static JSON (and downloadable .ics) files for US federal and all-50-state holidays (2025–2028), 30 countries' public holidays, plus FOMC meeting dates, US tax deadlines, market holidays, and key-date calendars for a dozen sports leagues. Every one of its 99 documented endpoints is a flat file behind Cloudflare, so there's no authentication, no rate limit, and CORS is wide open — licensed CC BY 4.0 as long as you link back.
| caldays | The Calendar | |
|---|---|---|
| Authentication | None | None |
| Pricing | freemium | free |
| Formats | JSON | JSON, ICS |
| CORS | yes | yes |
| HTTPS | Yes | Yes |
The Calendar supports 2 response formats, while caldays offers fewer — pick The Calendar for more integration flexibility.