Number Ticker

Installation#

CLI

npx shadcn@latest add https://hantui-theta.vercel.app/r/number-ticker.json

Manual

1. Install the dependencies

   npmpnpmbunyarn

   npm install clsx motion tailwind-merge

2. Add the shared helpers

   Components use cn() from lib/utils.ts and the motion tokens below. See Installation if you have not set them up yet.

   lib/motion.ts

   import type { Transition, Variants } from "motion/react";
   
   /** Durations in seconds. */
   export const duration = {
     instant: 0.1,
     quick: 0.18,
     base: 0.28,
     slow: 0.45,
   } as const;
   
   /** Cubic-bezier curves. */
   export const ease = {
     /** Entering, UI response. */
     out: [0.22, 1, 0.36, 1],
     /** Moving on screen. */
     inOut: [0.65, 0, 0.35, 1],
     /** Sheets and the mobile menu. */
     drawer: [0.32, 0.72, 0, 1],
   } as const;
   
   /** Everyday UI: presses, icon swaps, popovers and modals. Exits run at `exitFactor` of the enter. */
   export const ui = {
     press: { scale: 0.96, duration: 0.12 },
     icon: { type: "spring", duration: 0.3, bounce: 0 },
     popover: { duration: 0.18, ease: ease.out },
     modal: { duration: 0.24, ease: ease.out },
     exitFactor: 0.6,
   } as const;
   
   /** Once-per-visit motion on the landing page: hero letters, the reel and the afterimage. */
   export const kinetic = {
     heroLetter: { duration: 0.6, ease: ease.out },
     /** Delay per letter, eased so the wave slows toward the end. */
     heroStep: 0.035,
     reelSwap: { type: "spring", duration: 0.5, bounce: 0.1 },
     /** Two afterimages: lag in seconds and opacity of each. */
     ghost: { lag: [0.04, 0.09], opacity: [0.14, 0.06] },
   } as const;
   
   /** Spring presets. */
   export const spring = {
     snappy: { type: "spring", stiffness: 500, damping: 30 },
     smooth: { type: "spring", stiffness: 260, damping: 26 },
     bouncy: { type: "spring", stiffness: 300, damping: 15 },
   } as const satisfies Record<string, Transition>;
   
   /** Stagger between siblings, in seconds (0.03–0.06). */
   export const stagger = {
     tight: 0.03,
     base: 0.045,
     loose: 0.06,
   } as const;
   
   /** Blur + fade + y-offset. Falls back to a plain fade under reduced motion. */
   export function enterVariants(reduceMotion?: boolean | null, y = 8): Variants {
     if (reduceMotion) {
       return {
         hidden: { opacity: 0 },
         visible: { opacity: 1, transition: { duration: duration.base } },
         exit: { opacity: 0, transition: { duration: duration.quick } },
       };
     }
     return {
       hidden: { opacity: 0, y, filter: "blur(4px)" },
       visible: {
         opacity: 1,
         y: 0,
         filter: "blur(0px)",
         transition: { duration: duration.base, ease: ease.out },
       },
       exit: {
         opacity: 0,
         y: -y / 2,
         filter: "blur(4px)",
         transition: { duration: duration.quick, ease: ease.out },
       },
     };
   }
   
   /** Scale 0.96 → 1 for popovers, menus and dialogs. */
   export function overlayVariants(reduceMotion?: boolean | null): Variants {
     if (reduceMotion) {
       return {
         hidden: { opacity: 0 },
         visible: { opacity: 1, transition: { duration: duration.quick } },
         exit: { opacity: 0, transition: { duration: duration.instant } },
       };
     }
     return {
       hidden: { opacity: 0, scale: 0.96, filter: "blur(2px)" },
       visible: {
         opacity: 1,
         scale: 1,
         filter: "blur(0px)",
         transition: { duration: duration.quick, ease: ease.out },
       },
       exit: {
         opacity: 0,
         scale: 0.96,
         filter: "blur(2px)",
         transition: { duration: duration.instant + 0.02, ease: ease.out },
       },
     };
   }
   
   /** Parent variants that stagger their children in. */
   export function staggerVariants(gap: number = stagger.base, delayChildren = 0): Variants {
     return {
       hidden: {},
       visible: { transition: { staggerChildren: gap, delayChildren } },
       exit: { transition: { staggerChildren: gap / 2, staggerDirection: -1 } },
     };
   }

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3. Copy the source

   components/ui/number-ticker/number-ticker.tsx

   "use client";
   
   import { useEffect, useRef, type ComponentProps } from "react";
   import { animate, motion, useInView, useMotionValue, useReducedMotion, useTransform } from "motion/react";
   import { cn } from "@/lib/utils";
   import { ease } from "@/lib/motion";
   
   export interface NumberTickerProps
     extends Omit<ComponentProps<"span">, "children" | "onAnimationStart" | "onDrag" | "onDragStart" | "onDragEnd"> {
     /** The number to count to. Changing it counts on from the number currently shown. */
     value: number;
     /** Where the first count starts. @default 0 */
     from?: number;
     /** Seconds the count takes. @default 1.4 */
     duration?: number;
     /** Seconds before the first count starts. @default 0 */
     delay?: number;
     /** Count once scrolled into view, or straight away. @default "inView" */
     trigger?: "inView" | "mount";
     /** Decimal places shown while counting. Defaults to the decimals in `value`. */
     decimals?: number;
     /** Intl.NumberFormat options, e.g. { style: "currency", currency: "USD" }. */
     format?: Intl.NumberFormatOptions;
     /** Locale for formatting. @default "en-US" */
     locale?: string;
     /** Text before the number, e.g. "+". */
     prefix?: string;
     /** Text after the number, e.g. "k users". */
     suffix?: string;
   }
   
   export function NumberTicker({
     value,
     from = 0,
     duration = 1.4,
     delay = 0,
     trigger = "inView",
     decimals,
     format,
     locale = "en-US",
     prefix = "",
     suffix = "",
     className,
     ...props
   }: NumberTickerProps) {
     const reduceMotion = useReducedMotion();
     const ref = useRef<HTMLSpanElement>(null);
     const inView = useInView(ref, { once: true, amount: 0.6 });
     const started = useRef(false);
     const places = decimals ?? (String(value).split(".")[1]?.length ?? 0);
     const formatter = new Intl.NumberFormat(locale, { minimumFractionDigits: places, maximumFractionDigits: places, ...format });
     const count = useMotionValue(from);
     // Rendered straight into the DOM by Motion, so counting never re-renders React.
     const text = useTransform(count, (v) => `${prefix}${formatter.format(v)}${suffix}`);
     const final = `${prefix}${formatter.format(value)}${suffix}`;
   
     useEffect(() => {
       if (trigger === "inView" && !inView) return;
       if (reduceMotion) {
         count.set(value);
         return;
       }
       const first = !started.current;
       started.current = true;
       const controls = animate(count, value, { duration, delay: first ? delay : 0, ease: ease.out });
       return () => controls.stop();
     }, [value, inView, trigger, reduceMotion, duration, delay, count]);
   
     return (
       <span className={cn("inline-grid", className)} {...props}>
         <span className="sr-only select-none">{final}</span>
         {/* The final value reserves the width, so counting never nudges the layout. */}
         <span aria-hidden="true" className="invisible col-start-1 row-start-1 select-none whitespace-nowrap">
           {final}
         </span>
         <motion.span ref={ref} aria-hidden="true" className="col-start-1 row-start-1 whitespace-nowrap">
           {text}
         </motion.span>
       </span>
     );
   }

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Usage#

import { NumberTicker } from "@/components/ui/number-ticker/number-ticker";

export function Stat() {
  return <NumberTicker value={12480} suffix="+" className="text-4xl font-semibold" />;
}

// Currency, compact
<NumberTicker value={1284000} format={{ style: "currency", currency: "USD", notation: "compact" }} />

API reference#

Accessibility#

• Screen readers read the final value from a visually hidden copy; the counting digits are aria-hidden, so intermediate numbers are never announced.
• If the value updates live and should be announced, wrap it in your own aria-live region.
• With reduced motion enabled, the final number appears immediately.