In 2026, which one should you choose between Flutter and React Native?
"TLDR: This article delves into the technical differences between Flutter and React Native in terms of rendering mechanisms. It begins by outlining the similarities between the two in market presence and ecosystem, then provides a detailed analysis of their respective rendering principles. By comparing core concepts such as JSX/TSX, fiber nodes versus widgets and elements, it reveals the fundamental differences between React's reliance on Chrome for DOM operations and Flutter's self-built rendering engine. Additionally, it introduces optimization techniques to reduce the complexity of diff calculations for improved performance, and summarizes the scenarios best suited for each framework."
If we look at it from a market and ecosystem perspective, as we approach 2026, Flutter and React Native have almost no significant differences (such as GitHub stars, number of repositories on GitHub, number of third-party packages).
Here, we are actually discussing from a technical perspective what the current situation of Flutter and React is, and what their real differences are.
Rendering Principles
No matter which technology it is, as long as it renders UI, it basically cannot escape the following three-layer structure:
Rendering Mechanism in React
In React, you can map to the diagram above as follows:
| JSX/tsx | Describes state and UI | It is only a description, not the actual holder of state |
|---|---|---|
| fiber Node | The object that actually holds state and UI | |
| chrome | Takes the UI object from the fiber node and actually renders the UI | This is delegated to Chrome; React cannot intervene |
React is just a DOM manipulation framework. The actual DOM is rendered by Chrome, and React has no authority to intervene in that process.
And DOM rendering is a very expensive process, so for performance reasons, DOM modifications must be minimized as much as possible.
After the user interacts with the DOM, the fiber node's state is marked as dirty, and the fiber node's methods are called to recalculate the JSX/TSX. A new fiber node state is obtained, and a diff comparison is performed.
Now, we know there are two trees: one is the virtual DOM tree, and the other is the real virtual DOM tree. To find the differences, we need a diff algorithm with O(N) time complexity.
To further optimize, React has introduced various tricks such as memo, useCallback, and useMemo. Regardless of which one, they all aim to reduce time complexity during diff calculation.
Rendering Mechanism in Flutter
Currently, Flutter and React are very similar. The only difference is that React does not have rendering capabilities—it delegates rendering entirely to Chrome—whereas Flutter has built its own rendering engine and does not use the components provided by the operating system.
In Flutter, there is a very similar comparison to React:
| widget | Similar to JSX/TSX in React | Only describes state and UI |
|---|---|---|
| element | Similar to the fiber node in React; a bridge between UI description and the actual UI object | Holds state and UI |
| renderObject | The object that can actually be rendered by the Flutter engine, held by the element |
- One widget corresponds to one element
- One element holds one widget
- One element holds one renderObject
- A widget obtains an element through
build - The element calculates widget updates and decides whether to update itself based on differences and reuse
Summary
From the above, it can be seen that the first two layers of the rendering mechanism are almost identical between React and Flutter. The only difference is the rendering engine: React delegates it to Chrome, while Flutter has developed its own, offering higher performance and controllability.
If it involves complex heavy-client logic (such as video editors, or very complex logic like heavy animations), Flutter can be used. For all other cases, React Native is sufficient.