Calendarific

Calendarific is a REST API platform providing public, local, and bank holiday data across 230+ countries, 3,300+ states, and 100+ languages, serving 10,000+ developers and enterprises including Expedia, Accenture, and Spotify via tiered subscription plans.

Company typePrivate
Founded2017
HeadquartersPhiladelphia, United States
Headcount1–10
GTM typeB2B
OfferingSoftware

What Calendarific does

Calendarific, operated by HATCHSQUARE Technologies LLC (incorporated in New Mexico, USA, with listed presence in Philadelphia), is a developer-facing REST API platform that delivers public, local, and bank holiday data plus observances across more than 230 countries, 3,300+ states, and 100+ languages. The core product is a single unified holiday calendar API returning JSON, supplemented by CSV/XLS data export. Underlying infrastructure uses latency-based DNS routing to serve over 90% of requests in under 10 milliseconds and cloud-based auto-scaling capable of absorbing over 500 million API queries per day, with data aggregated and verified from multiple sources and updated on a cadence ranging from quarterly (free) to daily (enterprise).

The company runs a self-serve, API-first go-to-market model. Developers can sign up directly at calendarific.com, receive an API key immediately, and access a free tier of 500 calls per month with attribution required. Paid tiers include Starter ($100/year or $12/month, 10,000 calls/month), Business ($500/year, 50,000 calls/month with weekly updates and priority support), and Enterprise ($4,000/year, 50,000,000 calls/month with dedicated support and daily dataset updates), with bespoke enterprise contracts available via direct contact. Payment is processed through Stripe, and the platform serves over 10,000 businesses and developers globally, with named enterprise users including Expedia, Accenture, AstraZeneca, Fujitsu, Twilio, and Spotify across travel, professional services, pharmaceuticals, technology, communications, and media verticals.

The company is privately held with no disclosed institutional or venture funding, operates with 1-10 employees, and has historically acquired a related calendar-data asset (CalendarIndex) in 2018. There are no reported patents, awards, partnerships, or AI/ML capabilities disclosed in the source materials.

Calendarific firmographics

Firmographics

Name: Calendarific
Legal name: HATCHSQUARE Technologies LLC
Website: https://calendarific.com
Company type: Private
Founded year: 2017
Operating status: Operating
Headcount range: 1–10 employees
Short description: Calendarific is a REST API platform providing public, local, and bank holiday data across 230+ countries, 3,300+ states, and 100+ languages, serving 10,000+ developers and enterprises including Expedia, Accenture, and Spotify via tiered subscription plans.
Ownership category
akta.pro rank

Calendarific industry classification

Industry

Product category: Holiday Data API
NAICS: Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518)
SIC: Services-Prepackaged Software (7372), Services-Computer Processing & Data Preparation (7374)
akta.pro primary industry: Email, Calendar & Scheduling (BPAMAMAC)

Keywords

Holiday data API
Public holidays database
Bank holidays API
Worldwide observances data
RESTful calendar API

Where Calendarific is headquartered

Location

Headquarters

HQ city: Philadelphia
HQ country: United States
HQ region: North America

Offices1 record

Markets served

Calendarific business model

Business model

GTM type: B2B
Offering type: Software
Cost components: Technology or R&D, Infrastructure, Operations, Personnel, Marketing or Sales

Revenue model

API Subscription Plans: Calendarific generates revenue through tiered API subscription plans ranging from free (500 calls/month) to enterprise ($4,000/year for 50 million calls/month). The company offers both annual and monthly billing options, with annual plans providing significant discounts. Premium subscriptions unlock features like attribution removal, priority support, complete historical data, and daily dataset updates.

Pricing tiers

Model	Billing	Price
Freemium	Annual	Free tier for developers to get started with basic API access
Subscription	Annual	Entry-level paid plan for small businesses and developers
Subscription	Annual	Mid-tier plan for growing businesses with higher usage needs
Subscription	Annual	High-volume enterprise plan with maximum capacity and support
Subscription	Monthly	Monthly billing option for Starter plan

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Calendarific product offering

Product offering

Core offering

Calendarific provides a RESTful API that delivers public, local, and bank holiday data, along with observances, across more than 230 countries, over 3,300 states, and in more than 100 languages. The service is delivered through tiered subscription plans (Free, Starter, Business, Enterprise) that scale API call volumes from 500 to 50,000,000 calls per month, with progressive features such as attribution removal, priority support, complete historical data, and daily dataset updates on the top tier. JSON is returned via the API and CSV/XLS export is included for offline usage.

Product overview

Calendarific is a single, unified holiday data API platform that provides access to comprehensive holiday information. The core offering is the Holiday Calendar API, which provides holiday data across 230+ countries, 3,300+ states, and 100+ languages. The service is offered through tiered subscription plans (Free, Starter, Business, and Enterprise) that differ in API call limits, language support, data freshness (quarterly to daily updates), and support levels. The platform also includes data export capabilities in CSV/XLS formats.

Differentiator

Problem solved

Functional benefit

Products and services

Holiday Calendar API RESTful API providing comprehensive holiday data including national holidays, local observances, religious holidays, and bank holidays across more than 230 countries, over 3,300 states, and in more than 100 languages, returning JSON data and supporting CSV/XLS export, with call volume scaled by subscription tier.

Companies that use Calendarific

Customer profile

Named customers6 records

Segments2 records

Ideal customer profiles2 records

Calendarific technology and API

Technology

Technology focussed Yes

API detail

Has API: Yes
API docs
API detail

Core technology

AI maturity

App detail

Feature4 records

Calendarific partnerships and signals

Strategic signal

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Calendarific competitors and assessment

Company assessment

Direct peers

OpenHolidays API: European-focused open public holiday API backed by public-sector data. Direct peer competing in the holiday-data-as-a-service category, particularly strong in EU markets where it overlaps with Calendarific's coverage.
timeanddate.com: Long-established provider of global holiday, calendar, and time data with web-based and API offerings. Closest direct competitor to Calendarific in the holiday data category, serving similar developer and enterprise use cases.
CalendarLabs: Provider of holiday calendars and date calculation data with API and downloadable calendar offerings. Direct competitor in the holiday data vertical serving similar developer and business integration use cases.
Nager.Date: Open-source public holiday API providing data across many countries. A direct competitor that competes on a free/open basis, particularly attractive to cost-sensitive developers and SMBs evaluating alternatives to paid APIs like Calendarific.

Others

Twilio (Calendar/Scheduling APIs): Listed as a Calendarific customer; also offers broader communications and scheduling APIs at scale. Adjacent ecosystem player whose usage of Calendarific illustrates the integration pattern of embedding third-party holiday data into developer platforms.

Emerging players

Abstract API: Aggregator of small developer APIs including holiday data, IP geolocation, and other utilities. Emerging player offering holiday data as one of many APIs, with comparable developer-first positioning and freemium tiers to Calendarific.
IPGeolocation API: Developer-first API provider offering holiday and observances data alongside geolocation and timezone APIs. Emerging player with overlapping product surface and a similar PLG/subscription go-to-market model.
APILayer (APIs for holidays, time, etc.): API marketplace and provider of small data APIs including holidays, exchange rates, and IP geolocation. Emerging player overlapping with Calendarific's developer-data positioning and tiered subscription pricing.

Broad incumbents

Microsoft Graph Calendar API: Microsoft's enterprise calendar and scheduling API embedded in Microsoft 365 and Outlook. A broad incumbent that bundles holiday/outlook calendar data into a much wider enterprise productivity platform, competing for enterprise scheduling use cases Calendarific serves.
Google Calendar API: Google's broad calendar platform offering holiday calendars as part of its wider productivity suite. A broad incumbent that bundles holiday data into a much larger calendar/email/collaboration ecosystem and could trivially expand features competing with Calendarific.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

Calendarific financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Calendarific leadership team

Management profile

Number of profiles

Calendarific funding detail

Funding detail

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

Calendarific M&A and investment

M&A and investment

M&A1 record

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Calendarific

What does Calendarific do?

Is Calendarific a public or private company?

Calendarific is a private company. It is classified as founder individual operated bootstrapped and is currently operating.

When was Calendarific founded?

Calendarific was founded in 2017. It employs 1 to 10 people.

Where is Calendarific based?

Calendarific is headquartered in Philadelphia, United States, in the North America region.

How does Calendarific make money?

One revenue line is on record: API Subscription Plans.

Who are Calendarific's main competitors?

Direct peers on record are OpenHolidays API, timeanddate.com, CalendarLabs and Nager.Date. Twilio (Calendar/Scheduling APIs) is listed as an others. Emerging players are Abstract API, IPGeolocation API and APILayer (APIs for holidays, time, etc.). Broad incumbents are Microsoft Graph Calendar API and Google Calendar API.

Does Calendarific have an API?

Yes. RESTful API providing access to public, local, and bank holidays, as well as observances, across more than 230 countries, over 3,300 states, and in more than 100 languages. Returns JSON data. Rate limits and usage quotas depend on subscription plan (Free: 500 calls/month, Starter: 10,000 calls/month, Business: 50,000 calls/month, Enterprise: 50,000,000 calls/month). Developer documentation is at calendarific.com/api-documentation.

What industry is Calendarific in?

Calendarific's product category is Holiday Data API. Its primary akta.pro industry code is BPAMAMAC, Email, Calendar & Scheduling. Its NAICS code is 518 and its SIC code is 7372.