FullCalendar vs React Big Calendar vs TOAST UI Calendar in 2026: Which Should You Use?

A scheduling UI is one of the hardest components to build from scratch: the week grid alone hides dozens of edge cases — overlapping events, all-day lanes, drag-and-drop resizing, timezone shifts, and mobile touch targets. That is why most teams reach for a calendar library instead. But the three most popular options pull in completely different directions: FullCalendar is a full product with a plugin ecosystem, React Big Calendar is a dependency-light React component, and TOAST UI Calendar is a framework-agnostic widget that has not seen a release in nearly two years. Picking the wrong one means rewriting your scheduling UI twice — once when you outgrow it, and once when its maintenance dies.

TL;DR — Quick Verdict

If you need resource timelines, multiple views, and premium-grade scheduling (staff shifts, room booking, project timelines), choose FullCalendar — it is the only one of the three still actively developed with a real commercial backing, and its React/Angular/Vue connectors make it usable anywhere. If you are building a React-only app and want zero framework lock-in beyond React itself, choose React Big Calendar — it is simple, MIT-licensed, and mature, but you must bring your own date library. Avoid starting new projects on TOAST UI Calendar — its feature set is impressive (built-in popups, milestone tasks, IE11 support) but the repo has been frozen since June 2024, and it phones home usage statistics by default. For a quick event grid with drag-and-drop in a pure React app, React Big Calendar wins on simplicity; for anything resembling a real scheduling product, FullCalendar wins on capability.

Quick Comparison

Decision Matrix — Which One for Your Use Case?

If your app also needs standalone date-picker inputs next to the grid, our React date picker comparison covers that adjacent problem.

FullCalendar — The Scheduling Product, Not Just a Widget

FullCalendar (20,616 stars, MIT, last push July 2026) started as a jQuery plugin in 2011 and has evolved into a framework-agnostic scheduling engine with official React, Angular, and Vue connectors. Version 7 moved to a plugin-and-theme architecture: you compose exactly the features you need instead of pulling one monolithic bundle.

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import { Calendar } from 'fullcalendar'
import classicThemePlugin from 'fullcalendar/themes/classic'
import dayGridPlugin from 'fullcalendar/daygrid'
import interactionPlugin from 'fullcalendar/interaction'

import 'fullcalendar/skeleton.css'
import 'fullcalendar/themes/classic/theme.css'
import 'fullcalendar/themes/classic/palette.css'

const calendarEl = document.getElementById('calendar')
const calendar = new Calendar(calendarEl, {
  plugins: [classicThemePlugin, dayGridPlugin, interactionPlugin],
  initialView: 'timeGridWeek',
  editable: true,
  events: [
    { title: 'Meeting', start: new Date() }
  ]
})

calendar.render()

The killer features are the ones the other two do not have: resource views (timeline per room/person/machine), a list view, recurring event expansion, and print-friendly rendering. The React connector wraps the same engine, so your event model stays identical between vanilla and React codebases. The trade-off: the Standard Bundle is heavier than a hand-rolled grid, and the truly advanced add-ons (resource timeline scheduler, Google Calendar feed) sit behind a paid premium tier — the open-source core remains MIT, but “everything included” is not true.

Building a real appointment flow rather than a widget? For self-hosted scheduling platforms in the Cal.com style, see our Cal.com vs Easy!Appointments vs Rallly guide.

React Big Calendar — The Minimal React Grid

React Big Calendar (8,745 stars, MIT, last push June 2026) describes itself as “gcal/Outlook-like” and was literally inspired by FullCalendar. It is a pure-React component with no opinion about your date handling — which is both its strength and its biggest footgun: you must configure a localizer using Moment.js, Globalize, date-fns, or Day.js before anything renders.

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import { Calendar, dateFnsLocalizer } from 'react-big-calendar'
import format from 'date-fns/format'
import parse from 'date-fns/parse'
import startOfWeek from 'date-fns/startOfWeek'
import getDay from 'date-fns/getDay'
import enUS from 'date-fns/locale/en-US'

const locales = { 'en-US': enUS }

const localizer = dateFnsLocalizer({
  format, parse, startOfWeek, getDay, locales,
})

const MyCalendar = (props) => (
  <div>
    <Calendar
      localizer={localizer}
      events={myEventsList}
      startAccessor="start"
      endAccessor="end"
      style={{ height: 500 }}
    />
  </div>
)

Note the style={{ height: 500 }} — the calendar’s container must have an explicit height or nothing renders. That single gotcha accounts for a large share of RBC GitHub issues. The component is flexbox-based, ships compiled CSS plus SASS variables for theming, and offers a drag-and-drop addon. Localization is handled entirely by your chosen date library, which means no hidden dependency on a date framework you do not already use — bring date-fns if you use date-fns, Day.js if you use Day.js.

Editorial teams planning content on shared boards may not need a widget at all — our content calendar planning guide walks through that workflow.

TOAST UI Calendar — Feature-Rich, But Frozen

TOAST UI Calendar (12,701 stars, MIT, last push June 2024 — two years of silence) is the most feature-complete of the three out of the box: monthly/weekly/daily and 2-week views, milestone and task schedule types, built-in create/detail popups, mouse drag and resize, theme customization, and even Internet Explorer 11 support. It ships plain-JavaScript, React, and Vue packages, and its monthly grid is arguably the prettiest default of the three.

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import Calendar from '@toast-ui/calendar';
import '@toast-ui/calendar/dist/toastui-calendar.min.css';

const calendar = new Calendar(document.getElementById('calendar'), {
  defaultView: 'month',
  usageStatistics: false,   // disable hostname telemetry
  isReadOnly: false,
  month: {
    startDayOfWeek: 0,
    dayNames: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
  },
});

Two things to know before adopting it. First, the README discloses that the library collects hostname statistics via Google Analytics “to measure statistics on the usage” — disable it with usageStatistics: false in the options. Second, and more importantly, the repository has had no meaningful activity since mid-2024. The feature set is complete, which is why it still works fine, but there is no roadmap, no security-fix guarantee, and no one answering new issues. If you adopt it today, plan a migration path to FullCalendar or React Big Calendar within your product cycle — treating a frozen dependency as permanent is how scheduling UIs end up as the reason a product cannot upgrade its toolchain.

Pitfalls and Migration Gotchas

1. RBC renders nothing without an explicit container height — style={{ height: 500 }} is not optional. The classic symptom: a blank div where your calendar should be, with zero console errors.
2. RBC requires a localizer; there is no default. Forgetting it throws immediately, but choosing Moment just to satisfy the requirement drags in a legacy date library you probably removed years ago. Match the localizer to the date library already in your bundle.
3. FullCalendar v7 changed its API. Older tutorials show @fullcalendar/daygrid packages and new Calendar(el, { plugins: [dayGridPlugin] }) from separate npm packages; v7 ships one fullcalendar package with plugin modules and theme CSS imports. If you follow a pre-2025 guide, the imports will not resolve.
4. FullCalendar premium is a real paywall. Resource timeline and scheduler features live in paid add-ons. If your budget is zero, evaluate whether the open-core features (day/week/month, list, drag-drop) cover your product before committing to the ecosystem.
5. TOAST UI telemetry is on by default. usageStatistics: false must be set explicitly; otherwise hostnames of your users’ browsers are reported to Google Analytics.
6. Frozen projects age silently. TOAST UI Calendar’s npm package still installs cleanly and passes audits today, but that can change without notice. Add a npm audit step and a periodic “is this still maintained?” check to your dependency review.

FAQ

Is FullCalendar free for commercial use?

Yes — the core is MIT licensed, including day/week/month/list views, drag-and-drop, and the React/Angular/Vue connectors. The premium tier (resource timeline, scheduler, Google Calendar integration) is a paid add-on on top of the free core.

Does React Big Calendar support drag-and-drop?

Yes, through a separate react-big-calendar addon package (addons/dragAndDrop) that wraps events with draggable/resizable handles. It is maintained in the same repository and covered in the SASS imports (addons/dragAndDrop/styles).

Which calendar library has the smallest bundle?

React Big Calendar, if you already use a date library — it adds only the component itself. FullCalendar’s Standard Bundle is the largest because it bundles many plugins; the plugin architecture lets you trim it, but the baseline is still bigger than RBC. TOAST UI Calendar sits in the middle but brings Preact, Immer, and DOMPurify as hard dependencies.

Is TOAST UI Calendar abandoned?

Not formally archived, but effectively frozen: the last commit to nhn/tui.calendar was June 2024. The issue tracker is still open and the package still works, but there is no active release cadence. Treat it as maintenance-mode software and plan accordingly.

Can I use these libraries with Vue or Angular?

FullCalendar has official connectors for React, Angular, and Vue 3. TOAST UI Calendar has official React and Vue wrappers. React Big Calendar is React-only — for other frameworks you would wrap it yourself or choose a different library.

Do these libraries handle timezones?

FullCalendar has built-in timezone handling (local, UTC, and named timezones via the IANA database). React Big Calendar defers all timezone logic to your chosen localizer/date library. TOAST UI Calendar works in local time and stores schedule start/end as timestamps, so timezone conversion is your responsibility.

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