CSS Design Spec Checker
Online CSS design spec checker for colors, typography, spacing, radius, shadow, and contrast, with batch CSS validation support
Color Rules
Allowed Color List
Ready: run single checks or batch-validate CSS styles.
Check Results
Rule Config
Statistics
Total Checks0
Pass0
Warning0
Fail0
Pass Rate0%
CSS Design Spec Checker Guide
CSS Design Spec Checker validates color, typography, spacing, radius, shadow, and contrast rules, and also supports batch CSS parsing so design and frontend teams can quickly spot style drift and maintain a consistent, accessible UI system.
Key Features
- Run single checks for color, font size, font family, spacing, radius, shadow, and contrast.
- Batch-check pasted CSS and get item-level validation results.
- Maintain editable color and shadow rule lists for your team standards.
- Export and import rule sets to reuse the same standards across projects.
- Track pass, warning, fail counts, plus pass rate in real time.
Recommended Workflow
- Set your team baseline for colors, type sizes, spacing, and radius values.
- Run targeted checks on critical style values before component merge.
- Paste component CSS into batch mode to locate out-of-spec properties.
- Use contrast checks for readability and WCAG compliance decisions.
- Export rule JSON and reuse it in other repositories or teams.
Use Cases
- Style consistency checks during design system rollout.
- Pre-release quality gates for component libraries.
- Visual baseline alignment in multi-designer collaboration.
- Accessibility review for text contrast in UI revamps.
FAQ
- Why no batch results? Ensure your CSS includes supported properties such as color, font-size, padding, or border-radius.
- Import failed, what should I check? Validate JSON format and expected field names.
- Is AA enough? AA is usually acceptable for body text, while key content can target AAA where practical.
Privacy
All rule checks, contrast calculations, and config parsing run locally in your browser. Your CSS and rule data are not uploaded.