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Measured entry

motion-primitives-image-comparison

hover-effectspatialmotion on file

A client-side React compound component for revealing one image against another with drag, touch, or optional hover input. It ships as editable shadcn registry source and uses Motion for spring-driven clipping, Tailwind utility classes for layout, and a project-local cn helper for class composition.

Specimen
Motion capture of the mounted demo, recorded by the harness. No audio track.
Harness screenshot of motion-primitives-image-comparison at 375 pixels wide
Harness screenshot at 375 pixels wide. No horizontal overflow recorded.
Harness screenshot of motion-primitives-image-comparison at 768 pixels wide
Harness screenshot at 768 pixels wide. No horizontal overflow recorded.
Harness screenshot of motion-primitives-image-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 motion-primitives-image-comparison
BuildOK
MountOK
Console errors0
Uncaught page errors0
Horizontal overflowclean at 375, 768, 1440
Axe critical0
Axe serious0
Axe moderate0
Axe minor0
Gzip marginal67.3 KB (132.7 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 29.58s
error during build:
[vite:load-fallback] Could not load <sandbox>/src/lib/utils (imported by src/cut/image-comparison.tsx): ENOENT: no such file or directory, open '<sandbox>/src/lib/utils'

Verdict

A focused, customizable image reveal that builds and mounts cleanly in the prepared harness. It needs a shadcn-style setup because the bare project cannot resolve its local utility import. Adopt it when the editable compound API justifies Motion and some accessibility follow-up.

Use it if

  • You need an interactive before-and-after reveal for redesigns, edits, restorations, or product states.
  • Your React app already uses Tailwind conventions and can accept copied registry source.
  • You want separate image and slider subcomponents so the handle and overlays remain customizable.

Skip it if

  • You need a package that works without project aliases, utility CSS, or a local class-merging helper.
  • Keyboard operation and native range semantics are required without adding them yourself.
  • You only need a static side-by-side comparison and do not want Motion in the client bundle.
  • Your images cannot share a fixed, positioned container with deliberate sizing supplied by the caller.

Install

Installation record for motion-primitives-image-comparison
Declared dependenciesmotion
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, copy the component source, install Motion, provide Tailwind or replace its utility classes, and add a cn-style class-merging helper at the expected alias or change that import. Also supply container sizing and consider adding keyboard controls and slider semantics.

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/ibelick/motion-primitives
License
MIT
Record published
2026-08-13

Alternatives

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