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caldays API vs Intellibook 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 Intellibook API if its data fits your use case better; on access and reliability it's level with caldays API.

Side by side

caldays APIIntellibook API
What it doesPublic holidays for 195+ countries.Appointment booking and availability API for salons and clinics.
Providercaldaysintellibookai developer resources
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 867 msOnline · 1280 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
caldays docs ↗Intellibook 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 →

Intellibook logoIntellibook API

Appointment booking and availability API for salons and clinics.

Official intellibookai developer resources and REST API documentation by Intellibook AI.

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 Intellibook FAQ

Do caldays API and Intellibook API need an API key?

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

More comparisons

caldays API alternatives · Intellibook API alternatives · best Calendar APIs