CalendarFreev1.0.0
shadcn's Calendar in Notchset: 44px days from Monday with ISO week numbers, today boxed, event dots, one ink block that stretches to the picked day, and months that slide away and settle in; single or range.
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Installation
Base UI
pnpm dlx shadcn@latest add https://beautiful-ui.dev/r/calendar.jsonRadix
pnpm dlx shadcn@latest add https://beautiful-ui.dev/r/radix-nova/calendar.jsonFree, no account or key. Use the command for your project's primitives: a radix-*, new-york or default style in components.json is Radix, a base-* style is Base UI. With the @beautiful-ui registry added, @beautiful-ui/<name> picks for you.
Install by hand
- 1. No extra packages: React and Tailwind CSS v4 are enough.
- 2. Copy the files to these paths (Source below, or save them all as a .zip)
- components/ui/notchset/calendar.tsx
- lib/beautiful-ui/notchset/calendar.tsx
- lib/beautiful-ui/notchset/instrument.tsx
- lib/beautiful-ui/notchset/root.ts
- 3. No stylesheet needed.
- 4. Install what it builds on first: shadcn's cn helper (lib/utils.ts, from npx shadcn init), the theme foundation (its tokens and base styles)
Styles didn't apply?
The CLI adds the styles to the CSS file named in components.json (tailwind.css). Check that it points at your global stylesheet, that the project uses Tailwind CSS v4, and that the file is imported in your root layout. Installed by hand: paste styles.css into that file.
Usage
Import it and pass your content. The props that matter most are listed next.
Example
"use client";
import * as React from "react";
import { Calendar } from "@/components/ui/notchset/calendar";
/** Days with scheduled evals, keyed YYYY-MM-DD. */
const evals = { "2026-10-06": ["Planner core"], "2026-10-09": ["Citations", "Safety"] };
export function EvalCalendar() {
const [day, setDay] = React.useState<Date | undefined>(new Date());
return <Calendar mode="single" selected={day} onSelect={setDay} events={evals} showWeekNumber showToday />;
}Props
mode–"single" | "range"One day, or a range (from, to).
selected / onSelect–Date | DateRangeControlled, as shadcn's.
month / onMonthChange–DateThe month shown.
disabled–(date) => booleanDays that can't be picked.
startMonth / endMonth–DateHow far the arrows go.
events–Record<YYYY-MM-DD, string[]>Up to three dots a day, counted in its label.
Show all 8 propsShow fewer
showWeekNumber / showToday–booleanISO weeks; a TODAY link.
size–"default" | "sm"44px or 40px days.
Source
components/ui/notchset/calendar.tsx
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