WCAG Contrast & Palette Checker
Calculate WCAG 2.1 relative luminance and evaluate AA/AAA accessibility compliance. Client-side processing executed directly in browser memory.
WCAG Contrast & Color Studio
Dual-engine contrast auditing (WCAG 2.1 & APCA), real-time typography simulation, 1-click color auto-fix, and colorblind vision preview.
Relative luminance contrast based on ISO/IEC 17025 standard calibration formulas.
APCA models human spatial perception, accounting for text size, font weight, and polarity adaptation.
Calculates and shifts lightness along the HSL color vector to the nearest compliant threshold.
Accessible Interfaces For Everyone
The quick brown fox jumps over the lazy dog. Legible typographic scale ensures clarity across content hierarchies, regardless of device display specs.
Bold visual statements require minimum 3.0:1 contrast for universal readability.
Simulates retinal cone deficiencies to guarantee readability across all color vision spectra.
How to use WCAG Contrast & Palette Checker
Direct execution in browser memory with full vector precision.
Upload or Drop File
Select your source file from your local disk or drag and drop it into the workspace canvas.
Process & Refine
Review automated results and use interactive controls like brush, crop handles, or sliders for precision adjustment.
Download Clean Output
Export your high-resolution file directly to local disk with full resolution integrity.
Built for privacy, speed, and precision
Ephemeral In-Memory Runtime
Files are processed ephemerally inside client-side RAM or temporary stateless workers. No storage, no logs.
Sub-Second Processing
Optimized canvas transformations and vector operations execute directly on the client thread without network transit.
Hardware Accelerated
Takes full advantage of modern GPU WebGL and HTML5 Canvas pipelines for fluid 60fps brush and pan interactions.
Frequently Asked Questions
Everything you need to know about WCAG Contrast & Palette Checker
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