react-resizable-panels vs split.js vs Allotment 2026

TL;DR

For most React apps, react-resizable-panels is the best default. Choose split.js when framework neutrality and tiny size matter most, and choose Allotment when you want an IDE-grade experience immediately.

Quick Comparison

Why this comparison matters in 2026

Split-pane UI is back because dashboards, AI workspaces, editor shells, and observability products all depend on it. The practical choice is between a React-native accessible layout system, a tiny framework-agnostic primitive, and a heavier component that feels more like VS Code out of the box.

In 2026, multi-panel UIs are no longer niche. Product teams ship inspectors, sidebars, logs, and preview panes as standard features. That makes resize handles, persisted layouts, and nested groups part of the core UX rather than a custom afterthought.

This topic is intentionally adjacent to existing PkgPulse coverage, not a duplicate. PkgPulse covers charts, editors, and component systems, but not split-pane layout primitives. This article stays focused on persistence, accessibility, and IDE-style resizing.

What actually changes the decision

• Accessibility is a separator here. Keyboard-resizable handles and sensible ARIA are expensive to retrofit later.
• Persistence matters if users spend all day in the product. Saved panel positions make a dashboard feel native.
• Layout model matters more than branding. Flex-based percentages and IDE-style snapping feel very different in edge cases.

react-resizable-panels

Package: react-resizable-panels | Weekly downloads: ~31.6M | Latest: 4.10.0

react-resizable-panels is the most balanced option for modern React products because it treats accessibility and persistence as primary features rather than plugin work.

import { Panel, PanelGroup, PanelResizeHandle } from 'react-resizable-panels';

<PanelGroup direction='horizontal' autoSaveId='workspace-layout'>
  <Panel defaultSize={25}>Sidebar</Panel>
  <PanelResizeHandle />
  <Panel>Editor</Panel>
</PanelGroup>

Best for: React dashboards and app shells that need nested groups, persisted layouts, and accessible separators. Tradeoff: You are buying into a flexbox percentage model, which is great for app shells but awkward for more bespoke absolute-positioned layouts.

Strengths:

• Excellent React ergonomics
• Keyboard-accessible resize handles
• Simple localStorage persistence via autoSaveId

Watch-outs:

• React-only
• Less ideal for DOM-level legacy integrations

split.js

Package: split.js | Weekly downloads: ~420K | Latest: 1.6.5

split.js remains relevant because some teams do not want a React-first layout system. It is a low-level tool, and that is both its biggest strength and its biggest cost.

import Split from 'split.js';

Split(['#nav', '#main'], {
  sizes: [20, 80],
  minSize: [200, 400],
  gutterSize: 8,
});

Best for: Tiny framework-agnostic integrations, legacy apps, and teams that want a primitive rather than an opinionated component. Tradeoff: You have to supply persistence, accessibility, and most of the ergonomics yourself.

Strengths:

• Very small
• Works with plain DOM
• Easy to drop into non-React apps

Watch-outs:

• No built-in accessibility story
• No layout persistence

Allotment

Package: allotment | Weekly downloads: ~203K | Latest: 1.20.5

Allotment shines when you want a layout that already feels like an IDE. If that is your product direction, the larger dependency is often justified.

import { Allotment } from 'allotment';
import 'allotment/dist/style.css';

<Allotment>
  <Allotment.Pane preferredSize={280}>Explorer</Allotment.Pane>
  <Allotment.Pane>Editor</Allotment.Pane>
</Allotment>

Best for: IDE-like React interfaces where snap behavior, nested panes, and polished resize UX matter more than bundle size. Tradeoff: Heavier and more opinionated than the other two, especially if you only need a simple two-column split.

Strengths:

• VS Code-style feel
• Good min/max and snap behavior
• Works especially well for editor shells

Watch-outs:

• Heavier bundle
• React-only and more opinionated

Which one should you choose?

• Choose react-resizable-panels when react dashboards and app shells that need nested groups, persisted layouts, and accessible separators.
• Choose split.js when tiny framework-agnostic integrations, legacy apps, and teams that want a primitive rather than an opinionated component.
• Choose Allotment when iDE-like React interfaces where snap behavior, nested panes, and polished resize UX matter more than bundle size.

Final recommendation

For most React apps, react-resizable-panels is the best default. Choose split.js when framework neutrality and tiny size matter most, and choose Allotment when you want an IDE-grade experience immediately.

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