Calendarific vs customJS

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Calendarific compared with customJS
Detail	Calendarific	customJS
What it does	Global Holiday Calendar API for National and Religious Holidays	The missing toolkit for what you build.
Stage	Established	Not given
Founded	2014	Not given
Based in	Not given	DE
Pricing model	Not given	freemium
Pricing	Not given	Not given
Key features	Access to 230+ countries and 3,300+ states and regions Holiday data in 100+ languages Substitute days included Regional granularity with state and province codes Low latency responses under 10ms Servers handling over half a billion API queries per day Holiday data types: national, local, religious, and observance Filter by month and day Stable holiday UUIDs JSON responses with copy-ready code samples	JavaScript Execution with full NPM support PDF Generation with pixel-perfect conversion Screenshots of any web page Static HTML page hosting Drag-and-drop form builder Headless form backend Email forwarding to webhooks Web scraper API for data extraction MCP Server for AI agent integration
What makes it different	Developer-friendly approach with simple authentication and no SDK required Data aggregated and verified from multiple sources Enterprise-grade with SLA and dedicated account managers Use-case-specific workflows for payroll, scheduling, and localization Flexible localization with fallback to English	Integrates directly into Make.com and n8n workflows Full NPM support for JavaScript execution White-label PDF generation without watermarks Free tier with 600 requests per month Combines code power with no-code simplicity
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	53 no change since last check	43 no change since last check
Trust Flow (Majestic)	21	18
Citation Flow (Majestic)	42	32
Referring domains (Majestic)	792	254

3 details filled in for both companies.

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