RollingNumber

@coinbase/cds-web@8.34.1

A numeric display that animates value changes with rolling digits.

Import

import { RollingNumber } from '@coinbase/cds-web/numbers/RollingNumber'

SourceView source codeStorybookView Storybook

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Basic Example

RollingNumber displays changing numeric values with a smooth per-digit roll animation and optional color pulse. It supports full Intl.NumberFormat options, custom typography, ReactNode prefixes/suffixes, and accessibility.

Pass a number in the value prop. Use the format prop for Intl formatting (currency, percent, grouping, compact) instead of pre-formatting the string yourself.

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Live Code

function Example() {
  const values = [12345.67, 123340.011, 1220340.0123];
  const [valIdx, setValIdx] = useState(0);

  return (
    <VStack gap={3}>
      <RollingNumber value={values[valIdx]} font="display3" />
      <Button
        onClick={() => {
          setValIdx((prev) => (prev + 1) % values.length);
        }}
        alignSelf="flex-start"
      >
        Next
      </Button>
    </VStack>
  );
}

Example Use Case

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Live Code

function Examples() {
  const [price, setPrice] = useState<number>(12345.67);
  const [difference, setDifference] = useState<number>(0);
  const onNext = () =>
    setPrice((p) => {
      const delta = (Math.random() - 0.5) * 200; // +/- 100
      const next = Math.max(0, p + delta);
      const newPrice = Math.round(next * 100) / 100;
      setDifference(newPrice - p);
      return newPrice;
    });

  const trendColor = difference >= 0 ? 'fgPositive' : 'fgNegative';

  return (
    <VStack gap={2}>
      <Text font="label1">Portfolio Balance</Text>
      <RollingNumber
        colorPulseOnUpdate
        font="display3"
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <HStack alignItems="center">
        <RollingNumber
          accessibilityLabelPrefix={difference > 0 ? 'up ' : difference < 0 ? 'down ' : ''}
          color={trendColor}
          font="body"
          format={{
            style: 'currency',
            currency: 'USD',
            minimumFractionDigits: 2,
            maximumFractionDigits: 2,
          }}
          prefix={
            difference >= 0 ? (
              <Icon color={trendColor} name="diagonalUpArrow" size="xs" />
            ) : (
              <Icon color={trendColor} name="diagonalDownArrow" size="xs" />
            )
          }
          styles={{
            prefix: {
              paddingRight: 'var(--space-1)',
            },
          }}
          suffix={`(${((Math.abs(difference) / price) * 100).toFixed(2)}%)`}
          value={Math.abs(difference)}
        />
      </HStack>
      <Text font="label1">BTC Conversion</Text>
      <HStack alignItems="center" gap={1}>
        <Icon color="fgPrimary" name="arrowsVertical" size="xs" testID="swap-icon" />
        <RollingNumber
          color="fgPrimary"
          fontFamily="body"
          fontSize="body"
          fontWeight="body"
          format={{ minimumFractionDigits: 8, maximumFractionDigits: 8 }}
          value={price / 150_000}
        />
      </HStack>
      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
    </VStack>
  );
}

Formatting

Use format prop for currency, percent, grouping, and compact notation formatting. The format prop takes in Intl.NumberFormat options.

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Live Code

function Example() {
  const [value, setValue] = React.useState(92345.67);
  const onNext = () => setValue((v) => v * 13.5);
  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Compact number with currency sign
      </Text>
      <h1>
        <RollingNumber
          font="display1"
          format={{
            style: 'currency',
            currency: 'USD',
            minimumFractionDigits: 2,
            maximumFractionDigits: 2,
            notation: 'compact',
          }}
          value={value}
        />
      </h1>
      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
      <Text as="p" display="block" font="label1">
        Number without grouping
      </Text>
      <RollingNumber
        font="display1"
        format={{
          useGrouping: false,
        }}
        value={92345.67}
      />
    </VStack>
  );
}

Typography

RollingNumber forwards all Text props, but only character-level typographic props (e.g., font, fontFamily, fontSize, fontWeight, lineHeight, tabularNumbers, color) are meaningful for its per-digit rendering. Layout/container props may have no effect—use them judiciously.

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Live Code

function Example() {
  const [price, setPrice] = React.useState(9876.54);
  const onNext = () =>
    setPrice((p) => Math.max(0, Math.round((p + (Math.random() - 0.5) * 100) * 100) / 100));
  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Font sizes, weights, and line heights
      </Text>
      <RollingNumber
        fontSize="display3"
        fontWeight="title3"
        value={price}
        format={{ style: 'currency', currency: 'USD' }}
      />
      <RollingNumber
        fontSize="title3"
        fontWeight="headline"
        value={price}
        format={{ style: 'currency', currency: 'USD' }}
      />
      <RollingNumber
        fontSize="body"
        fontWeight="body"
        lineHeight="display3"
        value={price}
        format={{ style: 'currency', currency: 'USD' }}
      />
      <Text as="p" display="block" font="label1">
        Responsive font (phone, tablet, desktop)
      </Text>
      <RollingNumber
        font={{ phone: 'body', tablet: 'title3', desktop: 'display3' }}
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <Text as="p" display="block" font="label1">
        Tabular numbers vs non-tabular
      </Text>
      <RollingNumber
        font="display3"
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <RollingNumber
        tabularNumbers={false}
        font="display3"
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
    </VStack>
  );
}

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Alignment

Keep tabularNumbers enabled (default) to avoid horizontal width shifting as digits change.

Color and Transition

Customize color and motion. Configure y to control the digit roll, and color for the pulse.

transition prop

• Type: { y?: Transition; color?: Transition } (framer-motion Transition)
• Optional type: 'tween' | 'spring' | 'inertia'; defaults to 'tween' if not provided
• Default: { y: { duration: durations.moderate3 / 1000, ease: curves.global }, color: { duration: durations.slow4 / 1000, ease: curves.global } }

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Live Code

function Example() {
  const [price, setPrice] = React.useState(555.55);
  const onNext = () =>
    setPrice((p) => Math.max(0, Math.round((p + (Math.random() - 0.5) * 50) * 100) / 100));

  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Color pulse and custom transition
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="title1"
        format={{ style: 'currency', currency: 'USD' }}
        transition={{
          color: { duration: 0.3, ease: 'easeInOut' },
          opacity: { duration: 0.3, ease: 'easeInOut' },
          y: { duration: 0.3, ease: 'easeIn' },
        }}
        value={price}
      />

      <RollingNumber
        colorPulseOnUpdate
        color="accentBoldBlue"
        font="title1"
        format={{ style: 'currency', currency: 'USD' }}
        transition={{
          color: { duration: 1.2, ease: 'easeInOut' },
          opacity: { duration: 1.2, ease: 'easeInOut' },
          y: { duration: 1.2, ease: 'easeIn' },
        }}
        value={price}
      />

      <Text as="p" display="block" font="label1">
        Customize positive and negative change colors
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="title1"
        negativePulseColor="bgWarning"
        positivePulseColor="fgPrimary"
        value={price}
      />

      <Text as="p" display="block" font="label1">
        Fast digits, slow color
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="title1"
        format={{ style: 'currency', currency: 'USD' }}
        transition={{
          color: { duration: 1.2, ease: 'easeInOut' },
          opacity: { duration: 0.1, ease: 'easeInOut' },
          y: { duration: 0.1, ease: 'easeIn' },
        }}
        value={price}
      />

      <Text as="p" display="block" font="label1">
        Springy digits
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="title1"
        format={{ style: 'currency', currency: 'USD' }}
        transition={{
          opacity: { duration: 2, ease: 'easeInOut' },
          y: {
            type: 'spring',
            stiffness: 1000,
            damping: 24,
            mass: 3,
          },
        }}
        value={price}
      />

      <Text as="p" display="block" font="label1">
        Custom easings
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="title1"
        format={{ style: 'currency', currency: 'USD' }}
        transition={{
          color: { duration: 0.5, ease: 'easeInOut' },
          opacity: { duration: 0.5, ease: 'easeInOut' },
          y: { duration: 0.25, ease: 'easeOut' },
        }}
        value={price}
      />
      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
    </VStack>
  );
}

Digit Transition Variants

RollingNumber supports two digit transition styles via the digitTransitionVariant prop:

• 'every' (default): Rolls through every intermediate digit (e.g., 1→2→3→...→9).
• 'single': Rolls directly to the new digit without showing intermediates. Direction (up/down) is based on the total value change.

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Live Code

function Example() {
  const [price, setPrice] = React.useState(12345.67);
  const [variant, setVariant] = React.useState<'every' | 'single'>('single');

  const onIncrease = () => setPrice((p) => Math.round((p + Math.random() * 500 + 100) * 100) / 100);
  const onDecrease = () =>
    setPrice((p) => Math.max(0, Math.round((p - Math.random() * 500 - 100) * 100) / 100));
  const onRandom = () =>
    setPrice((p) => {
      const delta = (Math.random() - 0.5) * 1000;
      return Math.max(0, Math.round((p + delta) * 100) / 100);
    });

  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Digit transition variant: <strong>{variant}</strong>
      </Text>
      <RollingNumber
        digitTransitionVariant={variant}
        font="display1"
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <HStack gap={2}>
        <Button onClick={onIncrease}>Increase</Button>
        <Button onClick={onDecrease}>Decrease</Button>
        <Button onClick={onRandom}>Random</Button>
      </HStack>
      <HStack gap={2}>
        <Button
          variant={variant === 'every' ? 'primary' : 'secondary'}
          onClick={() => setVariant('every')}
        >
          Every
        </Button>
        <Button
          variant={variant === 'single' ? 'primary' : 'secondary'}
          onClick={() => setVariant('single')}
        >
          Single
        </Button>
      </HStack>
    </VStack>
  );
}

Variant comparison

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Live Code

function Example() {
  const [price, setPrice] = React.useState(98765.43);

  const onNext = () =>
    setPrice((p) => {
      const delta = (Math.random() - 0.5) * 2000;
      return Math.max(0, Math.round((p + delta) * 100) / 100);
    });

  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Every variant (default)
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        digitTransitionVariant="every"
        font="display3"
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <Text as="p" display="block" font="label1">
        Single variant
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        digitTransitionVariant="single"
        font="display3"
        format={{ style: 'currency', currency: 'USD' }}
        value={price}
      />
      <Button alignSelf="flex-start" onClick={onNext}>
        Random Change
      </Button>
    </VStack>
  );
}

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Direction-aware animation

The single variant determines scroll direction based on the total value change, not individual digit changes. When the value increases, digits roll up (new digits enter from below). When the value decreases, digits roll down (new digits enter from above). This matches the behavior of the color pulse feature.

Prefix and Suffix

Attach text or React nodes before/after the number to create rich compositions. If the prefix/suffix is a string, it will pulse color together with the main number.

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Live Code

function Example() {
  const values = [98345.67, 91345.67, 123450.123, 1234512.88];
  const textPrefixes = ['+', '-', ''];
  const textSuffixes = [' BTC', ' ETH', ''];
  const iconPrefixes = [
    <Icon key="arrowUp" name="arrowUp" size="l" />,
    <Icon key="arrowDown" name="arrowDown" size="l" />,
    null,
  ];
  const iconSuffixes = [
    <Icon key="arrowDown" name="arrowDown" size="l" />,
    <Icon key="arrowUp" name="arrowUp" size="l" />,
    null,
  ];
  const [idx, setIdx] = React.useState(0);
  const onNext = () => setIdx((i) => (i + 1) % values.length);
  const value = values[idx];
  const format = {
    style: 'currency' as const,
    currency: 'USD',
    minimumFractionDigits: 2,
    maximumFractionDigits: 5,
  };
  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Simple text prefix and suffix
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="display1"
        format={format}
        prefix={textPrefixes[idx]}
        suffix={textSuffixes[idx]}
        value={value}
      />

      <Text as="p" display="block" font="label1">
        ReactNode prefix and suffix
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="display1"
        format={format}
        prefix={iconPrefixes[idx]}
        suffix={iconSuffixes[idx]}
        value={value}
      />

      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
    </VStack>
  );
}

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Live Code

function SubscriptionPriceExample() {
  const [yearly, setYearly] = React.useState(false);
  const price = yearly ? 199 : 19;
  const suffix = yearly ? '/yr' : '/mo';
  return (
    <VStack gap={1}>
      <RollingNumber
        colorPulseOnUpdate
        accessibilityLabel={`$${price} ${suffix === '/yr' ? 'yearly' : 'monthly'}`}
        font="display1"
        format={{
          style: 'currency',
          currency: 'USD',
          minimumFractionDigits: 0,
          maximumFractionDigits: 0,
        }}
        styles={{
          suffix: {
            position: 'relative',
            top: 'var(--space-1_5)',
            color: 'var(--color-fgMuted)',
            fontSize: 'var(--fontSize-title1)',
          },
        }}
        suffix={suffix}
        transition={{
          y: { type: 'spring', stiffness: 80, damping: 24, mass: 3 },
        }}
        value={price}
      />
      <Button alignSelf="flex-start" onClick={() => setYearly((v) => !v)}>
        {yearly ? 'Switch to monthly' : 'Switch to yearly'}
      </Button>
    </VStack>
  );
}

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Accessibility

When using React nodes for prefix/suffix, provide an accessibilityLabel or use accessibilityLabelPrefix/accessibilityLabelSuffix so screen readers announce a descriptive string.

Style Overrides

Customize the look of each logical section (i18nPrefix, integer, fraction, i18nSuffix, prefix, suffix).

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Live Code

function Example() {
  const [price, setPrice] = React.useState(12345.67);
  const onNext = () => {
    setPrice((p) => Math.max(0, Math.round((p + (Math.random() - 0.5) * 200) * 100) / 100));
  };
  return (
    <VStack gap={2}>
      <Text as="p" display="block" font="label1">
        Customize per-section styles
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="display1"
        format={{
          style: 'currency',
          currency: 'USD',
          minimumFractionDigits: 2,
          notation: 'compact',
        }}
        prefix="-"
        styles={{
          root: {
            border: '1px dashed var(--color-bgLine)',
            padding: '4px 8px',
            borderRadius: 8,
            background: 'var(--color-bgSecondaryWash)',
          },
          i18nPrefix: { color: 'var(--color-accentBoldBlue)' },
          prefix: { color: 'var(--color-accentBoldPurple)' },
          integer: { letterSpacing: '-1px' },
          fraction: { opacity: 0.2, letterSpacing: '10px' },
          i18nSuffix: { color: 'var(--color-fgMuted)' },
          suffix: { color: 'var(--color-accentBoldYellow)', marginLeft: 10 },
        }}
        suffix="BTC"
        value={price}
      />
      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
    </VStack>
  );
}

Subscript Notation for Tiny Decimals

Enable enableSubscriptNotation to compactly represent leading zeros in the fractional part.

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Live Code

function Example() {
  const values = [0.0000000001, 0.00009, 0.000012, 0.0000001, 0.000000000000000000000011];
  const [idx, setIdx] = React.useState(0);
  const value = values[idx];
  const format = { minimumFractionDigits: 2, maximumFractionDigits: 25 };
  return (
    <VStack gap={1}>
      <Text as="p" display="block" font="label1">
        Subscript examples
      </Text>
      <Text as="span" display="block" font="label2">
        Default:
      </Text>
      <RollingNumber font="display3" format={format} value={value} />
      <Text as="span" display="block" font="label2">
        With subscript:
      </Text>
      {(['display1', 'title3', 'body'] as const).map((fontKey) => (
        <RollingNumber
          key={fontKey}
          enableSubscriptNotation
          font={fontKey}
          format={format}
          value={value}
        />
      ))}
      <Button alignSelf="flex-start" onClick={() => setIdx((i) => (i + 1) % values.length)}>
        Next
      </Button>
    </VStack>
  );
}

User-Provided Formatted Value

You can also provide formattedValue, and the component will render formattedValue directly instead of using the internal formatter. The numeric value is still required to drive animations and color pulse.

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Live Code

function Example() {
  const btcPrices = [
    { value: 98765.43, formattedValue: '¥98,765.43 BTC' },
    { value: 931.42, formattedValue: '$931.42 BTC' },
    { value: 100890.56, formattedValue: '¥100,890.56 BTC' },
    { value: 149432.12, formattedValue: '¥149,432.12 BTC' },
    { value: 150321.23, formattedValue: '¥150,321.23 BTC' },
  ];
  const subscripts = [
    { value: 0.0000000001, formattedValue: '€0,0₉1', accessibilityLabel: '€0.0000000001' },
    { value: 0.00009, formattedValue: '€0,0₄9', accessibilityLabel: '€0.00009' },
    { value: 0.000012, formattedValue: '€0,0₄12', accessibilityLabel: '€0.000012' },
    { value: 0.0000001, formattedValue: '€0,0₆1', accessibilityLabel: '€0.0000001' },
    {
      value: 0.000000000000000000000011,
      formattedValue: '€0,0₂₂11',
      accessibilityLabel: '€0.000000000000000000000011',
    },
  ];
  const [idx, setIdx] = React.useState(0);
  const onNext = () => setIdx((i) => (i + 1) % 5);
  return (
    <VStack gap={1}>
      <Text as="p" display="block" font="label1">
        User-provided formatted value
      </Text>
      <Text as="p" display="block" font="label2">
        BTC prices
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        font="display3"
        formattedValue={btcPrices[idx].formattedValue}
        prefix={<Icon name="crypto" size="l" />}
        value={btcPrices[idx].value}
      />
      <Text as="p" display="block" font="label2">
        Subscripts with a comma as the decimal separator
      </Text>
      <RollingNumber
        colorPulseOnUpdate
        accessibilityLabel={subscripts[idx].accessibilityLabel}
        font="display3"
        formattedValue={subscripts[idx].formattedValue}
        value={subscripts[idx].value}
      />
      <Button alignSelf="flex-start" onClick={onNext}>
        Next
      </Button>
    </VStack>
  );
}

󰔂

Accessibility and formattedValue

When you provide formattedValue, the accessibilityLabel will default to your formattedValue. However, what’s rendered on screen is not always ideal for accessibility. For example, the subscript notation '0₉' may be announced as '09'. Provide your own accessibilityLabel as needed.

Patterns & Recipes

Practical demos combining formatting, animation, and interactivity.

Counter

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Live Code

function CounterExample() {
  const [count, setCount] = React.useState(0);
  return (
    <VStack gap={1}>
      <HStack alignItems="center" gap={2}>
        <IconButton name="minus" onClick={() => setCount((c) => Math.max(0, c - 1))} />
        <RollingNumber
          colorPulseOnUpdate
          font="display1"
          format={{ minimumFractionDigits: 0, maximumFractionDigits: 0 }}
          value={count}
        />
        <IconButton name="add" onClick={() => setCount((c) => c + 1)} />
      </HStack>
    </VStack>
  );
}

Countdown

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Live Code

function CountDownExample() {
  const pad = (n: number) => String(n).padStart(2, '0');
  const totalSeconds = 5 * 60;
  const [seconds, setSeconds] = React.useState(totalSeconds);
  const [running, setRunning] = React.useState(false);

  React.useEffect(() => {
    if (!running) return;
    const id = setInterval(() => {
      setSeconds((prev) => {
        if (prev <= 1) {
          clearInterval(id);
          return 0;
        }
        return prev - 1;
      });
    }, 1000);
    return () => clearInterval(id);
  }, [running]);

  const minutes = Math.floor(seconds / 60);
  const secs = seconds % 60;
  const formatted = `${pad(minutes)}:${pad(secs)}`;

  const onReset = () => setSeconds(totalSeconds);
  const progress = Math.max(0, Math.min(1, (totalSeconds - seconds) / totalSeconds));

  return (
    <VStack gap={1}>
      <RollingNumber font="display3" formattedValue={formatted} value={seconds} ariaLive="off" />
      <HStack gap={2}>
        <Button onClick={() => setRunning((r) => !r)}>{running ? 'Pause' : 'Start'}</Button>
        <Button onClick={onReset}>Reset</Button>
      </HStack>

      <Text font="label1">Countdown with percent</Text>
      <VStack gap={1}>
        <ProgressBar progress={progress} />
        <RollingNumber
          font="body"
          format={{ style: 'percent', maximumFractionDigits: 0 }}
          prefix="Elapsed: "
          value={progress}
          ariaLive="off"
        />
      </VStack>
    </VStack>
  );
}

Live Auction

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Live Code

function LiveBiddingExample() {
  const [currentBid, setCurrentBid] = useState(45000);
  const [bidCount, setBidCount] = useState(23);
  const [timeLeft, setTimeLeft] = useState(180);

  React.useEffect(() => {
    const timer = setInterval(() => {
      setTimeLeft((t) => Math.max(0, t - 1));
    }, 1000);
    return () => clearInterval(timer);
  }, []);

  const placeBid = (increment: number) => {
    setCurrentBid((b) => b + increment);
    setBidCount((c) => c + 1);
  };

  const minutes = Math.floor(timeLeft / 60);
  const seconds = timeLeft % 60;

  return (
    <VStack gap={2}>
      <VStack gap={1}>
        <Text color="fgMuted" font="caption">
          Current Bid
        </Text>
        <RollingNumber
          colorPulseOnUpdate
          font="display2"
          format={{ style: 'currency', currency: 'USD', minimumFractionDigits: 0 }}
          positivePulseColor="accentBoldRed"
          transition={{
            y: { type: 'spring', stiffness: 200, damping: 20 },
          }}
          value={currentBid}
        />
        <HStack gap={1}>
          <RollingNumber font="body" format={{ minimumFractionDigits: 0 }} value={bidCount} />
          <Text font="body">bids placed</Text>
          <Text color="fgMuted" font="body">
            •
          </Text>
          <RollingNumber
            color={timeLeft < 30 ? 'fgNegative' : 'fg'}
            font="body"
            formattedValue={`${minutes}:${String(seconds).padStart(2, '0')}`}
            value={timeLeft}
            ariaLive="off"
          />
          <Text font="body">remaining</Text>
        </HStack>
      </VStack>
      <HStack gap={1}>
        <Button onClick={() => placeBid(100)}>+$100</Button>
        <Button onClick={() => placeBid(500)}>+$500</Button>
        <Button onClick={() => placeBid(1000)}>+$1000</Button>
      </HStack>
    </VStack>
  );
}

Social Media Statistics

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Live Code

function StatisticsExample() {
  const [views, setViews] = useState(1234567);
  const [likes, setLikes] = useState(89432);
  const [shares, setShares] = useState(12789);
  const [downloads, setDownloads] = useState(567890);

  const simulateActivity = () => {
    setViews((v) => v + Math.floor(Math.random() * 1000));
    setLikes((l) => l + Math.floor(Math.random() * 200));
    setShares((s) => s + Math.floor(Math.random() * 100));
    setDownloads((d) => d + Math.floor(Math.random() * 500));
  };

  return (
    <VStack gap={2}>
      <HStack gap={4}>
        <VStack alignItems="center" gap={0.5}>
          <RollingNumber
            colorPulseOnUpdate
            font="title1"
            format={{ notation: 'compact', maximumFractionDigits: 1, minimumFractionDigits: 1 }}
            positivePulseColor="accentBoldBlue"
            value={views}
          />
          <Text color="fgMuted" font="caption">
            Views
          </Text>
        </VStack>
        <VStack alignItems="center" gap={0.5}>
          <RollingNumber
            colorPulseOnUpdate
            font="title1"
            format={{ notation: 'compact', maximumFractionDigits: 1, minimumFractionDigits: 1 }}
            positivePulseColor="accentBoldRed"
            prefix={<Icon color="accentBoldRed" name="heart" />}
            styles={{ prefix: { paddingRight: 'var(--space-0_5)' } }}
            value={likes}
          />
          <Text color="fgMuted" font="caption">
            Likes
          </Text>
        </VStack>
        <VStack alignItems="center" gap={0.5}>
          <RollingNumber
            colorPulseOnUpdate
            font="title1"
            format={{ notation: 'compact', maximumFractionDigits: 1, minimumFractionDigits: 1 }}
            positivePulseColor="accentBoldGreen"
            value={shares}
          />
          <Text color="fgMuted" font="caption">
            Shares
          </Text>
        </VStack>
        <VStack alignItems="center" gap={0.5}>
          <RollingNumber
            colorPulseOnUpdate
            font="title1"
            format={{ notation: 'compact', maximumFractionDigits: 1, minimumFractionDigits: 1 }}
            positivePulseColor="accentBoldPurple"
            value={downloads}
          />
          <Text color="fgMuted" font="caption">
            Downloads
          </Text>
        </VStack>
      </HStack>
      <Button alignSelf="flex-start" onClick={simulateActivity}>
        Simulate Activity
      </Button>
    </VStack>
  );
}

Anatomy & Customization

RollingNumber is composed of small, swappable subcomponents and exposes granular className/style hooks for each section of the number. Use these to customize structure and styling or to plug in your own components.

Subcomponents

• RollingNumberMaskComponent: Component used to mask the animated digit content.
• RollingNumberAffixSectionComponent: Component used to render ReactNode prefix / suffix props.
• RollingNumberValueSectionComponent: Component used to render the four Intl.NumberFormat sections (i18nPrefix, integer, fraction, i18nSuffix).
• RollingNumberDigitComponent: Component used to render the per-digit roll animation.
• RollingNumberSymbolComponent: Component used to render non-digit symbols (group separators, decimal, literals, etc.).

You can replace any of these with your own components via props:

<RollingNumber
  RollingNumberMaskComponent={MyMask}
  RollingNumberAffixSectionComponent={MyAffixSection}
  RollingNumberValueSectionComponent={MyValueSection}
  RollingNumberDigitComponent={MyDigit}
  RollingNumberSymbolComponent={MySymbol}
  value={1234.56}
  format={{ style: 'currency', currency: 'USD' }}
/>

Class name overrides

Use classNames to target specific parts for CSS styling (Linaria or your own classes):

• root: Outer container (Text root)
• visibleContent: Motion-wrapped span containing the visible number (color animation lives here)
• formattedValueSection: Container around the four i18n sections
• i18nPrefix: Section generated by Intl.NumberFormat before the number
• integer: Integer part of the number
• fraction: Fractional part of the number
• i18nSuffix: Section generated by Intl.NumberFormat after the number
• prefix: Wrapper around your prefix prop
• suffix: Wrapper around your suffix prop
• text: Text element used for digits, separators, prefix, and suffix

Style overrides

Use styles to inline style specific parts:

• root, visibleContent, formattedValueSection, i18nPrefix, integer, fraction, i18nSuffix, prefix, suffix, text

styles.text applies to the shared Text component that renders digits, symbols, prefix, and suffix.

Structure diagrams

High-level anatomy of RollingNumber and its sections:

RollingNumber (root: Text)
  ├── screenReaderOnly <span aria-live>  (hidden a11y text)
  └── <m.span> (visibleContent)
       ├── AffixSection (prefix)               ← your ReactNode prefix
       ├── HStack (formattedValueSection)
       │    ├── ValueSection (i18nPrefix)
       │    ├── ValueSection (integer)
       │    ├── ValueSection (fraction)
       │    └── ValueSection (i18nSuffix)
       └── AffixSection (suffix)               ← your ReactNode suffix

Per-digit rendering inside a ValueSection:

ValueSection
  ├── Symbol(s)     (e.g., currency, group, decimal)
  └── Digit(s)
       └── Mask
            └── DigitContainer (animated)
                 ├── non-active digits above (positioned)
                 ├── active digit (centered)
                 └── non-active digits below (positioned)