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Measured entry

magicui-code-comparison

cardbentomotion on file

A client-side React card that renders before-and-after code with Shiki highlighting, diff and focus annotations, theme-aware colors, and a responsive split layout. It ships as a shadcn registry component and relies on Shiki transformers, next-themes, Lucide, Tailwind utility classes, design tokens, and the shared cn helper.

Specimen
Motion capture of the mounted demo, recorded by the harness. No audio track.
Harness screenshot of magicui-code-comparison at 375 pixels wide
Harness screenshot at 375 pixels wide. This viewport scrolled sideways.
Harness screenshot of magicui-code-comparison at 768 pixels wide
Harness screenshot at 768 pixels wide. No horizontal overflow recorded.
Harness screenshot of magicui-code-comparison at 1440 pixels wide
Harness screenshot at 1440 pixels wide. No horizontal overflow recorded.

Measured

Every value below was written by the harness on the run that produced the frames above. None of it is derived from the prose.

Harness measurements recorded for magicui-code-comparison
BuildOK
MountOK
Console errors0
Uncaught page errors0
Horizontal overflowflagged at 375
Axe critical0
Axe serious1
Axe moderate0
Axe minor0
Gzip marginal1886.5 KB (1951.9 KB build, 65.4 KB baseline)
Bare modeFAIL
Provider requiredNO
Demo usedwritten from the component source API

What the harness recorded

BARE BUILD

✗ Build failed in 37.45s
error during build:
[vite:load-fallback] Could not load <sandbox>/src/lib/utils (imported by src/cut/code-comparison.tsx): ENOENT: no such file or directory, open '<sandbox>/src/lib/utils'

Verdict

A capable documentation-focused comparison card, but its syntax engine is costly and the tested narrow layout overflows. It also needs contrast work. It builds in the prepared harness, yet a bare app fails because it needs a shadcn-style setup, especially the shared utility import.

Use it if

  • You need an embedded before-and-after code example in documentation or a product changelog.
  • Your app already uses Tailwind, shadcn conventions, and theme-aware syntax highlighting.
  • You want Shiki annotations for highlighted, added, removed, or focused lines.

Skip it if

  • Your primary audience uses narrow screens where horizontal overflow is unacceptable.
  • You have a strict bundle budget and only need a simple static code diff.
  • You must ship with no known color-contrast violations.
  • Your project does not use Tailwind or shadcn-style aliases and utilities.

Install

Installation record for magicui-code-comparison
Declared dependenciesshiki, next-themes, @shikijs/transformers
Missing on installnone
Bare installfails once the shadcn-style helpers are removed, so it needs that setup
Providerno provider required in the harness

In a non-shadcn project, add Shiki, the Shiki transformers, next-themes, and Lucide React. Provide a cn class-merging helper at the expected alias or change that import, configure Tailwind with the referenced theme tokens and arbitrary variants, and wire theme context if the app supports light and dark modes.

Source and credit

This page is a review, not a copy. The component source lives with its author and this site does not republish it. Read the license before you use anything.

Author repository

github.com/magicuidesign/magicui
License
MIT
Record published
2026-08-14

Alternatives

Other published entries for the card pattern, ordered by what they measured: mounts first, then clean axe scans, then bare-mode passes, then the smaller bundle.