NumberFlow is an animated number component for React designed to provide smooth, accessible, and highly customizable numerical transitions. It is a dependency-free tool that automatically handles the complexity of animating digits when their value changes.

The main features of this tool include:

• Automatic Animated Transitions: The component detects when its value prop changes and automatically triggers a smooth transition between the old and new numbers.

• Built-in Formatting and Localization: It leverages the standard Intl.NumberFormat API, allowing you to easily apply formatting options (like currency or compact notation) and specific locales. You can also add custom prefixes and suffixes.

• Fine-Grained Animation Control:

  • Timings: You can customize the duration and easing for layout transforms, digit spin animations, and opacity fades independently.

  • Trends: You can control the direction of the digits—forcing them to always go up, always go down, or follow the natural direction of the value change.

  • Continuous Transitions: A dedicated plugin allows numbers to appear to pass through all in-between values during a transition.

• Layout Synchronization:

  • Grouping: The <NumberFlowGroup> component allows you to sync transitions between multiple related number components so they move together harmoniously.

  • Isolation: The isolate prop can be used to prevent a number's transition from affecting other layout changes on the page.

• Advanced Styling Options: NumberFlow uses a custom element under the hood, exposing specific CSS "parts" (like ::part(suffix)) for detailed styling. It also provides custom CSS properties to adjust masking gradients and character heights.

• Accessibility and Performance: By default, the tool respects user motion preferences. It also supports the will-change property to optimize performance for numbers that update frequently.

• Developer Hooks: It includes the useCanAnimate hook, which allows developers to check if the user's browser supports the necessary animation features and if they have enabled motion preferences.