UI Consistency Checker is a Chrome extension designed to ensure the visual integrity of web applications. This tool addresses common issues faced during the development process, such as discrepancies in component appearance, spacing, and color. It provides a framework for defining components, allowing users to document expected CSS properties and states. The extension then compares these specifications with the actual computed styles on the live page, offering precise insights into any visual mismatches.

Key features include a robust comparison engine that normalizes color values, expands shorthand CSS properties, and resolves units to pixels for accurate comparisons. The tool also includes an auto-fix feature that allows users to inject corrective CSS directly into the page for immediate visualization. With capabilities such as grid overlays for alignment checks and multi-state verification, UI Consistency Checker is valuable for teams and solo developers alike, ensuring that final outputs align with original design intentions.