This New React Native Animation Library Is Insane

App and Flow shipped React Native Ease, a library from Yanik and the same team behind libraries like react-native-safe-area-context. It targets the animations you reach for constantly on the web with CSS transitions: opacity, transforms, fades, and crossfades when state changes.

The pitch is performance. Ease is not a Reanimated replacement. Reanimated still owns gestures, layout animation, shared elements, and anything that needs to run logic every frame. Ease is the lighter tool when you just want enter/exit motion that stays smooth even if JavaScript is busy.

I walk through the announcement post, install it in Platano (my AI image app template), and refactor real onboarding screens that used useSharedValue, useAnimatedStyle, and Reanimated entering animations.

What's inside

• What React Native Ease is and why App and Flow built it
• Core Animation, Android Animator, and zero JavaScript overhead
• How native platform APIs keep motion smooth under load
• Ease vs Reanimated: what each library is for
• Install with Expo, prebuild, and run on device
• Replacing Reanimated with EaseView on onboarding
• Crossfade checkmarks and staggered reveal screens
• When to use Ease vs Reanimated in a real app

What React Native Ease is

React Native Ease is a new animation library with a CSS-transition-style API. You declare what should animate and the operating system runs it. There is no JavaScript animation loop, no worklets, and no shared values for the simple cases it covers.

The library was created by Yanik at App and Flow, the Expo agency behind many packages you already depend on. I start from their announcement post and the FAQ that answers the obvious question: if Reanimated exists, why another library? The short answer is that running JS every frame for a basic fade is overkill when iOS and Android already expose fast native primitives.

Supported properties include opacity, transforms, background color, and border radius on non-layout props. Layout-driven width/height changes, gesture-driven motion, and shared element transitions stay in Reanimated territory.

Core Animation and Android Animator

On iOS, Ease builds on Core Animation, Apple's system for animating views and visual layers. On Android, the equivalent is the Animator API. React Native Ease wraps those primitives so your fade or scale does not compete with React renders on the JavaScript thread.

The announcement includes a side-by-side demo: when the UI thread stalls, a Reanimated-style loop can stutter, while Core Animation / Animator keeps playing. That is the practical reason premium apps care about this library. Subtle motion should not glitch because a list re-rendered or a heavy effect ran on JS.

Zero JavaScript overhead

With Reanimated, even "simple" animations often mean shared values, animated styles, and hooks wired per component. On a checklist screen with four animated rows, that is four shared values plus useAnimatedStyle for each row.

Ease flips the model: you pass animate and a transition (for example timing) to EaseView, imported from react-native-ease, and delete the Reanimated boilerplate. The crossfade runs entirely on the OS. I slows the transition to one second in the demo so you can see the check icon and circle icon blend smoothly on press.

One honest caveat from the same screen: border color animation still uses Reanimated in that example because Ease does not support border animation yet. That mixed stack is normal. Use the right tool per property, not one library for the whole file.

Ease vs Reanimated

Reanimated is incredibly flexible. It can drive gestures, layout, and complex interpolation. It still updates views on the UI thread from JavaScript every frame. Flexible, but not the maximum performance path for a plain fade.

React Native Ease maps to what you would solve with CSS transitions on the web. Reanimated maps to what you need when the animation is the interaction: pan, pinch, layout morphs, shared elements.

The README table in the tutorial boils down to:

• Ease: enter/exit, fade, slide, scale, opacity on state change
• Reanimated: gestures, layout animation, shared elements, complex interpolation

Pinch-to-zoom on an image in Platano stays on Reanimated because Ease cannot do it. Onboarding checkmarks and congratulation screen reveals move to Ease.

Install and prebuild

Install is one command in an Expo project:

npx expo install react-native-ease

Because Ease includes native code, you prebuild for iOS and Android and recompile. Expo Go alone is not enough once native modules are involved. After the native build, start the dev server and open the app on a simulator or device.

The demo codebase is Platano, a template for shipping AI image apps quickly: onboarding, paywall-ready flows, native styling, and the kind of polish you want before App Store submission. I use it in the tutorial because it is real production UI, not a todo app toy example.

EaseView on onboarding

The onboarding checklist animates a crossfade between a check icon and a circle when the user taps an option. The Reanimated version used Animated.View, useAnimatedStyle, and a useSharedValue per row. Four options meant four shared values on one screen, more on other steps.

Swapping to EaseView removes the shared value and animated style hook entirely. Import from react-native-ease, pass animate plus transition={{ type: "timing", ... }}, and keep the same visual result with less code. I deletes the Reanimated hook live so you can see the diff.

This is the migration pattern worth copying in your app: search for FadeIn, FadeOut, FadeInDown, and simple entering layouts. Those are prime candidates to replace with EaseView before you touch gesture-driven screens.

Crossfade and staggered reveal

The congratulations step after onboarding questions reveals each bullet with a delay. The Reanimated version used FadeInDown from entering animations. The Ease version keeps the same stagger array but drives reveal through EaseView with animate and transition props instead of entering={...}.

Before and after look the same on iOS in the recording: smooth stagger, clean motion. The difference is maintainability and performance headroom, not a totally new visual language. I also note that the UI on that screen was still being polished. The animation approach is what I wanted to ship.

When to use each library

The closing rule I apply in Platano:

1. State-driven UI (toggle selected, step complete, modal open): Ease
2. Gestures (pan, pinch, drag dismiss): Reanimated
3. Layout (height/width changes, shared elements): Reanimated

Planned follow-up in the template: replace more FadeIn / FadeOut / EaseIn / EaseOut usages app-wide, including playground screens, while leaving pinch-zoom and multi-image selection on Reanimated.

If you want the gesture and layout side in depth, the Animations and Gestures section in the React Native course covers Reanimated and gesture-handler end to end. Ease does not replace that learning path. It narrows what you reach for on a typical Tuesday afternoon.

Resources

LessonAnimations and Gestures

Reanimated, gesture-handler, and interactive UI patterns when Ease is not enough.

CourseReact Native course

Fundamentals through shipping: the concepts behind the prompts, with lifetime access.