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caldays API vs Non-Working Days 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 you want faster responses.
  • Choose Non-Working Days API if its data fits your use case better; on access and reliability it's level with caldays API.

Side by side

caldays APINon-Working Days API
What it doesPublic holidays for 195+ countries.Simple REST API for checking working, non-working or short days for Russia, CIS, USA and other.
ProvidercaldaysisDayOff()
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 867 msOnline · 2770 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
caldays docs ↗Non-Working Days 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 →

Non-Working Days logoNon-Working Days API

Simple REST API for checking working, non-working or short days for Russia, CIS, USA and other.

API производственного календаря

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 Non-Working Days FAQ

Do caldays API and Non-Working Days API need an API key?

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

More comparisons

caldays API alternatives · Non-Working Days API alternatives · best Calendar APIs