Diffchecker — Text comparison

Developer ToolsSee it livediffchecker.com

Two aligned documents highlight removed passages in red and added passages in green, with comparison options at the left.

Diffchecker — Text comparison — captured interface — Viewport capture · opening screen

Public demo · 2026-09-08Open full image ↗

Why this pattern works

Align changed documents line by line and reinforce difference counts with matching inline highlight colors.

Design notes

Surface: Diffchecker — Text comparison
Navigation: Comparison formats sit in the top navigation; display options occupy a narrow side panel.
Layout: Parallel text columns align corresponding lines beneath change counts and sharing controls.
Density: High text density is organized by line numbers and consistent row alignment.
Color: White surfaces, pale red removals, and pale green additions.
Type: Small sans-serif labels keep tools and content visually separate.
Pattern: Align changed documents line by line and reinforce difference counts with matching inline highlight colors.
States: This capture records the visible state only. Loading, error, and later workflow states were not verified.
Don't: Adapt the interface pattern with original content, branding, and data; do not infer behavior from a still image.

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What should the tool respect?

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Prompt text

# My project
[Describe the product, audience, and screen you want to improve]

Stack: Use the existing project stack
Task: Implement the interface and verify the result in the existing project.

## Tool guidance (Any AI tool)
Use available project tools to inspect, implement, and test. State any unavailable capabilities.

# Design reference: Diffchecker — Text comparison
Source: https://www.diffchecker.com/unsaved/nIfFoOV3/
Swipefile reference: https://swipefile.design/ref/ui-diffchecker/
Captured: 2026-09-08. This is a dated reference, not a claim about the current live product.
Capture scope: one viewport. Do not infer unseen page sections or a complete user flow.

## Objective
Adapt the interaction and layout patterns below to my project. Use my own content and identity. Do not reproduce logos, proprietary copy, or brand assets.

## Reference notes
- surface: Diffchecker — Text comparison
- nav: Comparison formats sit in the top navigation; display options occupy a narrow side panel.
- layout: Parallel text columns align corresponding lines beneath change counts and sharing controls.
- density: High text density is organized by line numbers and consistent row alignment.
- color: White surfaces, pale red removals, and pale green additions.
- typography: Small sans-serif labels keep tools and content visually separate.
- pattern: Align changed documents line by line and reinforce difference counts with matching inline highlight colors.
- states: This capture records the visible state only. Loading, error, and later workflow states were not verified.
- dont: Adapt the interface pattern with original content, branding, and data; do not infer behavior from a still image.

Useful for: Align changed documents line by line and reinforce difference counts with matching inline highlight colors.

## Acceptance criteria
- Existing project conventions, design tokens, working functionality, and unrelated changes are preserved.
- Two or three reference principles clearly support the user's task; conflicts are resolved in favor of usability and the existing product.
- Reusable components and semantic HTML express the interface. Available licensed assets are used; important UI text is never rendered as a bitmap.
- Every visible control has a defined behavior. Loading, empty, error, success, disabled, and long-content states are specified where relevant. Demo data is clearly labeled.
- Navigation and content adapt at 375px, 768px, and 1440px without horizontal page overflow. Keyboard use, visible focus, labeled inputs, at least 44px touch targets, readable contrast, and reduced motion are supported.
- Verification distinguishes rendered behavior from proposals and identifies anything still requiring a backend or external service.

## Quality bar
Clear hierarchy, consistent spacing, restrained surfaces, and purposeful motion. Avoid decorative gradients, excessive cards, placeholder buttons, and invented metrics unless the project calls for them. Do not claim a feature is connected or tested without evidence.

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## Objective
Adapt the interaction and layout patterns below to my project. Use my own content and identity. Do not reproduce logos, proprietary copy, or brand assets.

Useful for: Align changed documents line by line and reinforce difference counts with matching inline highlight colors.

Diffchecker — Text comparison

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