FullCalendar
FullCalendar is an open-source JavaScript event calendar library serving front-end developers and enterprises with a free MIT-licensed core and commercial premium plugins for scheduling and resource management.
- Company typePrivate
- Founded2009
- Headquarters—
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What FullCalendar does
FullCalendar is an open-source JavaScript event calendar library built on a modular plugin architecture centered on the @fullcalendar/core package and a Preact-based virtual DOM rendering engine. Its plugin ecosystem spans over 30 packages including view plugins (dayGrid, timeGrid, list, multiMonth, timeline), data-source integrations (Google Calendar, iCalendar, RRule recurrence), date/time libraries (Luxon, Moment.js), theming (Bootstrap 4/5), and resource-scheduling add-ons (resource-timeline, resource-daygrid, resource-timegrid). Official framework connectors (@fullcalendar/react, @fullcalendar/vue3, @fullcalendar/angular) provide native integration with the three dominant front-end frameworks, and the v5 release swapped the internal Preact engine for React's virtual DOM when used inside the React package. The library reports 2M+ monthly NPM downloads, 70M+ CDN downloads, and 17K+ GitHub stargazers across more than a decade of continuous development.
FullCalendar operates as FullCalendar LLC, a sole proprietorship wholly owned and operated by founder Adam Shaw, with a small remote team of contractors and no disclosed institutional investment. The business follows a product-led growth model anchored on a free MIT-licensed core that drives self-serve adoption through NPM and CDN distribution, while monetization comes from commercial licenses on premium plugins (notably the Scheduler and resource-timeline suite) sold directly to for-profit enterprises via [email protected]. Free non-commercial and GPLv3 license paths cover nonprofits, universities, governments, and open-source projects. Premium support plans provide an additional revenue stream. Named enterprise users of the library include Amazon, Netflix, Uber, PayPal, Samsung, Intuit, Yahoo, Akamai, Cisco, Deloitte, Accenture, NASA, AstraZeneca, and Pfizer, though the majority of these are likely free-tier adopters.
FullCalendar firmographics
Firmographics- Name
- FullCalendar
- Legal name
- FullCalendar LLC
- Website
- https://fullcalendar.io
- Company type
- Private
- Founded year
- 2009
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- FullCalendar is an open-source JavaScript event calendar library serving front-end developers and enterprises with a free MIT-licensed core and commercial premium plugins for scheduling and resource management.
- Ownership category
- akta.pro rank
FullCalendar business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Operations, Others
Revenue model
- FullCalendar Standard (MIT): Free open-source core plugins and standard bundle released under MIT license, permitting wide commercial use with copyright headers preserved
- FullCalendar Premium Commercial License: Premium plugins (scheduler, resource timeline, etc.) require commercial licenses for for-profit companies. Allows source modifications but not redistribution of modifications
- FullCalendar Premium Non-Commercial License: Free non-commercial license available for registered nonprofit organizations, universities, and governmental entities. Does not permit source code modifications
- FullCalendar Premium GPLv3 License: Open-source projects fully GPLv3-compliant may use FullCalendar Premium freely under GPLv3 license
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Others | FullCalendar Standard - Free |
| Subscription | Annual | FullCalendar Premium - Commercial |
Go-to-market motion1 record
Distribution channels4 records
Marketing channels5 records
FullCalendar product offering
Product offeringCore offering
FullCalendar provides a JavaScript event calendar library with drag-and-drop features, modular plugins for various calendar views (dayGrid, timeGrid, timeline, list, multiMonth), and official framework connectors for React, Vue, and Angular. The offering follows a dual-licensing model: a free MIT-licensed open-source core for general use and a commercial-licensed Premium tier that adds advanced resource scheduling and timeline plugins.
Product overview
FullCalendar is a JavaScript event calendar library positioned as the most popular JavaScript calendar solution, with over 2M NPM downloads per month and 70M CDN downloads. The product follows a dual licensing model with a free open-source core (MIT licensed) and premium paid plugins (requiring commercial licenses for for-profit use). The ecosystem is built on a modular plugin architecture centered on the @fullcalendar/core package, with additional view plugins providing different calendar displays (DayGrid for month views, TimeGrid for time-based views, List for list views, MultiMonth for multi-month display). Framework-specific connectors (@fullcalendar/react, @fullcalendar/vue3, @fullcalendar/angular) provide deep integration with React, Vue, and Angular frameworks. Premium plugins (@fullcalendar/resource-timeline, @fullcalendar/timeline, @fullcalendar/scrollgrid) enable advanced scheduling and resource management features. The product also includes theming plugins (Bootstrap 5, Bootstrap 4), data source plugins (Google Calendar, iCalendar), and date/time handling plugins (Luxon, Moment.js, RRule) to extend core functionality.
Differentiator
Problem solved
Functional benefit
Products and services
- FullCalendar Standard The free, open-source core calendar library offering the Calendar class, DayGrid, TimeGrid, and List view plugins, released under MIT license for broad commercial and non-commercial use. Targeted at JavaScript developers building web applications that need calendar functionality.
- FullCalendar Premium Commercial licensing tier for Scheduler, Timeline, and resource-based plugins (resource-timeline, resource-daygrid, resource-timegrid) requiring paid commercial licenses for for-profit use, with free non-commercial and GPLv3 open-source usage options. Designed for enterprise scheduling, resource allocation, and event management dashboards.
- Premium Support Plans Purchasable support plans offering premium assistance for FullCalendar Premium users.
Quantifiable outcome
- 2M+ NPM downloads per month
- +2 more outcomes
Companies that use FullCalendar
Customer profileNamed customers14 records
Segments4 records
Ideal customer profiles4 records
FullCalendar technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration10 records
Feature4 records
FullCalendar partnerships and signals
Strategic signalScale indicators6 records
Recent moves5 records
Expansion highlights5 records
FullCalendar competitors and assessment
Company assessmentBroad incumbents
- DevExpress: Commercial UI component vendor offering Scheduler, Calendar, and Gantt controls across React, Angular, and Vue. Competes with FullCalendar Premium in enterprise scheduling RFPs, particularly with larger seat-count licensing.
- Material UI (MUI): Leading open-source React component library. Currently ships Date/Time Pickers, with FullCalendar-style full calendar views under development. Strong bundling threat as enterprise teams consolidate on MUI's design system.
- Syncfusion: Large commercial UI component suite including Essential JS 2 Scheduler and Calendar controls. Competes with FullCalendar Premium in enterprise scheduling purchases as part of broader component-bundle licensing.
- PrimeReact: Open-source React UI component library including a Calendar and Schedule components. Comparable target customer (enterprise React teams) and overlapping feature surface with FullCalendar's standard plugin set.
- Kendo UI (Telerik/Progress): Commercial UI component library with React, Angular, and Vue suites including Scheduler and Calendar components. Targets the same enterprise buyers as FullCalendar Premium with bundled component licensing.
- Ant Design: Open-source enterprise React UI library including a Calendar component. Competes indirectly with FullCalendar where enterprise teams standardize on Ant Design's design system and prefer bundled components.
Direct peers
- Toast UI Calendar (NHN): Open-source JavaScript calendar library from NHN, supporting day/week/month views and resource scheduling. Comparable scope and target audience to FullCalendar, with a comparable free + commercial split.
- DayPilot: JavaScript scheduler/calendar component library (open-source Lite edition + commercial Pro edition). Directly competes with FullCalendar in resource scheduling, Gantt, and timeline views across Angular, React, and Vue.
- react-big-calendar: Open-source React calendar component widely used as a direct alternative to FullCalendar's React connector. Targets the same developer persona (React front-end engineers building scheduling UIs) with overlapping day/week/month views, though narrower plugin architecture.
Emerging players
- Schedule-X: Newer open-source JavaScript calendar/scheduler library with framework-agnostic core and React/Vue/Angular adapters. Targeting the same developer base as FullCalendar with a modern bundle architecture.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
FullCalendar social profiles
Digital presenceFullCalendar financial estimates
Financial estimateRevenue estimate
Valuation estimate
FullCalendar leadership team
Management profileNumber of profiles
Profiles1 record
FullCalendar funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
FullCalendar M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about FullCalendar
What does FullCalendar do?
FullCalendar provides a JavaScript event calendar library with drag-and-drop features, modular plugins for various calendar views (dayGrid, timeGrid, timeline, list, multiMonth), and official framework connectors for React, Vue, and Angular. The offering follows a dual-licensing model: a free MIT-licensed open-source core for general use and a commercial-licensed Premium tier that adds advanced resource scheduling and timeline plugins.
Is FullCalendar a public or private company?
FullCalendar is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was FullCalendar founded?
FullCalendar was founded in 2009. It employs 11 to 50 people.
How does FullCalendar make money?
Four revenue lines are on record. FullCalendar Standard (MIT) is the primary driver. The others are fullCalendar Premium Commercial License, fullCalendar Premium Non-Commercial License and fullCalendar Premium GPLv3 License.
Who are FullCalendar's main competitors?
Broad incumbents on record are DevExpress, Material UI (MUI), Syncfusion, PrimeReact, Kendo UI (Telerik/Progress) and Ant Design. Direct peers are Toast UI Calendar (NHN), DayPilot and react-big-calendar. Schedule-X is listed as an emerging player.
Does FullCalendar have an API?
No public API is recorded for FullCalendar.