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caldays API vs The Calendar API

Two free Calendar APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

  • Choose caldays API if its data fits your use case better; on access and reliability it's level with The Calendar API.
  • Choose The Calendar API if its data fits your use case better; on access and reliability it's level with caldays API.

Side by side

caldays APIThe Calendar API
What it doesPublic holidays for 195+ countries.Public holidays for US states and 30 countries plus sports and finance calendars as static JSON.
Providercaldaysthe-calendar.net
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 867 msOnline · 643 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
caldays docs ↗The Calendar docs ↗

About each API

caldays logocaldays API

Public holidays for 195+ countries.

Free REST API for public holidays, long weekends, and calendars across 206 countries. 10,000 requests/day with no API key, clean JSON responses, CC BY licensed. Start building in minutes.

Strengths

  • No API key needed
  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

The Calendar logoThe Calendar API

Public holidays for US states and 30 countries plus sports and finance calendars as static JSON.

Free static JSON API: US/world public holidays, FOMC dates, sports and finance calendars. CORS-open, no auth, no rate limit.

Strengths

  • No API key needed
  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

How to choose between them

  • Prototyping or a tutorial? Pick the one that needs no API key (both qualify).
  • Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
  • Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
  • Still unsure? Both are free to try: send one request to each and compare the data you get back.

caldays vs The Calendar FAQ

Do caldays API and The Calendar API need an API key?

Neither needs an API key; you can call both straight away.

More comparisons

caldays API alternatives · The Calendar API alternatives · best Calendar APIs