#What is NumberFlow?

NumberFlow, is an open-source animated number component created by Maxwell Barvian (@MBarvian) for React, Vue, Svelte, and vanilla JavaScript/TypeScript. Built on Intl.NumberFormat and Web Animations API, it provides smooth, dependency-free transitions for numbers, ideal for counters, prices, or stats. With 6.3k GitHub stars and 123 forks, it’s praised for its Apple-like smoothness (inspired by the Family iOS app) and used by platforms like X and Dub.co. NumberFlow is MIT-licensed, actively maintained (latest release v0.5.9, April 2025), and deployable on Vercel, offering formatting for currencies, percentages, and compact notations.

#Features ⚡️

• Smooth Animations: Digit spin, fade, and transform effects for number transitions.

• Formatting Options: Supports currency (e.g., USD), percentages, and compact notation via Intl.NumberFormat.

• Locale Support: Localizes numbers for various languages (e.g., en-US, ja-JP), though non-Latin digits may error.

• Customizable: Adjust animation timing, prefixes/suffixes, and CSS properties like mask height.

• Accessibility: Respects prefers-reduced-motion and ensures screen-reader compatibility.

• NumberFlowGroup: Syncs multiple NumberFlow instances for layout consistency.

• Plugins: Continuous plugin for fluid in-between number transitions.

#Pros and Cons

#Pros ✅

• Dependency-Free: Lightweight (~6.8kB gzipped for Svelte) with no external libraries.

• Cross-Framework: Supports React, Vue, Svelte, and vanilla JS, plus a SolidJS fork.

• Highly Customizable: Extensive props for animation, formatting, and styling.

• Active Community: 6.3k stars, featured on X, Reddit, and Bytes.dev, with real-world use by X.

• Accessible: Built-in support for reduced motion and ARIA compliance.

#Cons ⚠️

• Non-Latin Digit Issues: Errors with locales like fa-IR or ar-OM using non-English numbers.

• RTL Limitations: Right-to-left locales not fully supported.

• Complex Styling: Changing font-size for digits is tricky due to CSS techniques.

• Browser Compatibility: CSS mod() may cause fallback on older browsers; Safari fixes ongoing.

• Bloat Concerns: Some users note ~47kB unminified JS is heavy for a visual effect.

#Included Components - Templates

• NumberFlow Component: Core component for animating numbers with props for value, format, and timing.

• NumberFlowGroup: Wrapper to sync multiple NumberFlow instances for layout animations.

• Continuous Plugin: Enables fluid transitions through in-between numbers.

• Example Templates: Social media stats (likes, views), price tags with currency, sliders, and counters.

• Vanilla JS Custom Element: <number-flow> for framework-free use with .update() method.

#Pricing 💸

NumberFlow operates on a Free model:

• Free Access: All features, including animations and formatting, are free under the MIT license.

• No premium version or paid features offered.

#Integrations 🧰

• React: Primary framework with @number-flow/react.

• Vue: Supported via @number-flow/vue.

• Svelte: Compatible with Svelte 4 & 5 via @number-flow/svelte.

• Vanilla JS/TS: Custom element <number-flow> for framework-free use.

• Intl.NumberFormat: Handles number localization and formatting.

• Web Animations API: Powers smooth, native animations.

• Vercel: Deployment platform for demos and hosting.

#Conclusion:

NumberFlow is a polished, dependency-free solution for animating numbers, offering Apple-like smoothness across React, Vue, Svelte, and vanilla JS. Its accessibility, customization, and active community (6.3k stars, used by X) make it ideal for dynamic UI elements, though non-Latin digit issues and styling limitations need attention.