CLIENT ENGINE // AIR-GAPPED

Color Picker & Palette Generator

Multi-format color conversion (HEX, RGB, HSL, OKLCH), instant WCAG 2.1 accessibility contrast calculation, and harmonic pastel chalk palette generation.

APPARATUS // COLOR-PICKER VERIFIED OK // 0.0ms

Quick Reference Benchmarks

Color Conversion Latency < 0.1 ms

Supported Color Models HEX, RGB, HSL, OKLCH

WCAG Standard ISO/IEC 40500 (WCAG 2.1)

Palette Generation Chalk Harmony (Local)

CSS Specification CSS Color Level 4

Mathematical Formula

\text{Ratio} = \frac{L_1 + 0.05}{L_2 + 0.05} \quad \text{where} \; L = 0.2126 R_{\text{lin}} + 0.7152 G_{\text{lin}} + 0.0722 B_{\text{lin}}

Calculates relative luminance according to the sRGB color space and determines WCAG 2.1 contrast ratios for AA and AAA compliance.

Overview & Background

Color representation in digital interface design has evolved rapidly from basic 24-bit sRGB and hexadecimal strings to modern perceptually uniform color spaces. Traditional web models like HSL (Hue, Saturation, Lightness) suffer from a critical perceptual defect: human eyes perceive green and yellow as substantially brighter than deep blue at the identical 50% lightness value. This flaw makes generating accessible, balanced design palettes in HSL difficult and prone to contrast violations. The OKLCH color model—standardized in CSS Color Module Level 4—rectifies this by mapping color coordinates directly to human visual perception. In OKLCH, a lightness of 70% delivers the same perceived luminance regardless of whether the hue is emerald mint, sky blue, or coral butter. Kitiverse equips modern web developers and UI designers with an all-in-one workbench to convert between HEX, RGB, HSL, and OKLCH, verify strict WCAG 2.1 contrast ratios against white and dark backgrounds, and discover delicate pastel chalk palettes.

How to convert colors and check accessibility contrast

Adjust the visual color swatch, sliders, or enter exact numerical values in any format. The converter keeps all formats synchronized in real time.

Select a base color using the native system color picker, or paste an existing HEX, RGB, HSL, or OKLCH string directly into the corresponding text box.

Inspect the live mathematical conversions across all four formats, which update in real time as you adjust hues or saturations.

Review the WCAG 2.1 contrast rating. The card computes the exact contrast ratio against both pure white (#FFFFFF) and deep slate (#0F172A) to verify Level AA (4.5:1) or Level AAA (7.0:1) compliance.

Explore the auto-generated pastel chalk harmony palette for inspiration and click any swatch or copy button to copy its hex code.

Frequently Asked Questions

What is the OKLCH color space and why should modern web designers use it?

OKLCH (Oklab Lightness, Chroma, Hue) is a cylindrical color space designed to reflect how human vision perceives color. Unlike traditional sRGB or HSL, OKLCH is perceptually uniform. This means that two colors with the same Lightness value (L) will appear equally bright to human observers, allowing designers to create predictable, accessible palettes without manually adjusting each hue.

What are the legal WCAG 2.1 contrast requirements for digital accessibility?

Under the internationally recognized Web Content Accessibility Guidelines (WCAG 2.1, codified as ISO/IEC 40500 and legally required under the Americans with Disabilities Act and European EN 301 549), body text must achieve a minimum contrast ratio of 4.5:1 against its background for Level AA compliance. Large text (at least 18pt or 14pt bold) requires at least 3:1. For enhanced Level AAA compliance, normal text must meet or exceed a 7:1 ratio.

Can I use OKLCH syntax directly in modern CSS stylesheets?

Yes. All modern evergreen web browsers (Chrome, Edge, Safari, Firefox) provide native support for the CSS Color Module Level 4 oklch() function (e.g. color: oklch(0.75 0.14 150)). This allows you to define colors directly in modern CSS without preprocessing or polyfills.

What happens if a color falls outside the standard sRGB display gamut?

While traditional computer monitors only display the sRGB color gamut, modern mobile phones and high-end displays support wider gamuts like Display P3. OKLCH can express vibrant P3 colors that cannot be rendered in sRGB. When converting from OKLCH to standard HEX or RGB, Kitiverse automatically clamps the values to the nearest valid sRGB boundary.

Does Kitiverse upload or store my brand color palettes?

No. All color math, matrix conversions, WCAG luminance calculations, and palette algorithms run entirely on your local machine within your browser's execution thread. Your color choices and brand palettes remain 100% private.

What is the relative luminance formula used for WCAG contrast calculation?

WCAG contrast is calculated from the relative luminance (L) of two colors, defined as the relative brightness of any point in a colorspace normalized to 0 for the darkest black and 1 for the lightest white. The formula applies linear gamma expansion to sRGB channels, weights them by human spectral sensitivity (0.2126 Red + 0.7152 Green + 0.0722 Blue), and computes the ratio (L1 + 0.05) / (L2 + 0.05).

Non-Institutional Disclaimer:

This utility is provided for informational and calculation assistance only. Verify all critical specifications with official regulatory bodies.