Overview
Pixel-perfect overlay alignment with guides, browser-side CSS diffs, and customizable AI prompt export.
PixelPerfect CSS Diff is a developer tool for comparing live webpages against reference designs, aligning pixels with overlays and guides, and exporting browser-observed CSS changes as AI-ready fix instructions. It is designed for frontend implementation reviews, visual QA, design reproduction checks, and AI-assisted CSS fixes. Main features: - Load a reference image over any webpage - Adjust overlay position, opacity, and scale - Drag and drop image files directly onto the panel - Use vertical and horizontal guides with saved position, thickness, color, and opacity - Save separate overlay states for desktop and mobile viewport widths - Keep the overlay and panel usable above modal dialogs created with dialog.showModal() - Capture browser-side CSS changes after visual adjustment - Copy CSS diffs as prompt-ready instructions for AI agents - Customize the prompt prelude used before exported CSS diff sections Typical workflow: 1. Open a page you want to review. 2. Load a reference design image. 3. Align the live page visually with the overlay and guides. 4. Set a CSS baseline, make final browser adjustments, and copy the resulting CSS diffs. 5. Send the exported instructions to an AI agent or use them directly when updating source files.
Details
- Version0.1.0
- UpdatedMay 12, 2026
- Offered byzetsubo-dev
- Size34.08KiB
- LanguagesEnglish
- Developer
Email
spiracss@gmail.com - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
Support
For help with questions, suggestions, or problems, visit the developer's support site
