Text Diff Viewer

Shows exactly what changed between two blocks of text — side-by-side or as a single unified list — with every added or removed line carrying a glyph and a screen-reader label so the change is readable without relying on colour.

Standard Data · Astro · Subscription · commercial licence · v1.0.2 · updated 2026-10-15 · Live demo

Install

velocityx add standard-text-diff-viewer

Subscription component. Run velocityx login with your key first — get one.

---
import TextDiffViewer from '../components/velocity/standard-text-diff-viewer/TextDiffViewer.astro';
---
<TextDiffViewer />

Props

Prop	Type	Default	Description
`before`	`string`	`""`	—
`after`	`string`	`""`	—
`beforeLabel`	`string`	`"Before"`	—
`afterLabel`	`string`	`"After"`	—
`mode`	`"split" \| "unified"`	`"split"`	—
`label`	`string`	`"Text comparison"`	—
`className`	`string`	`""`	—

Files written

velocityx drops these into your project:

components/velocity/standard-text-diff-viewer/TextDiffViewer.astro

Peer dependencies

None.

Theming

Colours come from the primary-* / accent-* Tailwind scales, so this drops into a project that is not Velocity without dragging our brand in. Install the contract once:

velocityx theme

Then set your whole brand in one place — raw RGB channels, not hex (a hex here silently breaks every opacity variant):

:root {
  --vx-brand: custom;
  --vx-primary-600: 220 38 38;
}

There is no component-level font-family anywhere in the library — your font cascade wins.

Licence

Commercial, for the duration of an active Velocity X subscription. The source is served by the licence-gated endpoint, never by the public CDN.