DevStudio's Color Picker converts colors between every common notation — hexadecimal, RGB, RGBA, HSL, HSLA, HWB, OKLCH, OKLab, and named CSS keywords — and computes WCAG accessibility contrast ratios entirely inside your browser. Pick a color from an interactive 2D gradient and a hue strip, type a value in any supported notation, or paste an existing string and the tool emits every other representation simultaneously, so you can copy the exact format your design tokens, your CSS file, or your design tool expects. The OKLCH and OKLab outputs are particularly useful when designing a perceptually uniform palette: unlike HSL, where moving along the lightness axis produces colors that do not match in perceived brightness, OKLCH treats lightness as a perceptually weighted dimension, which makes it dramatically easier to build accessible color scales. The contrast checker computes both the legacy WCAG 2.x ratio and the newer APCA estimate against any background color you choose, and labels each result with its WCAG 2 conformance level — Fail, AA Large, AA, or AAA — so you can immediately see whether body text or a UI control will meet the regulatory threshold for your project. Common use cases include auditing an existing palette for accessibility before a design system review, converting a hex color from a brand guideline into the HSL form your CSS variables expect, sampling a color from a screenshot and producing a Tailwind-ready value, building a perceptually balanced gradient by interpolating in OKLCH instead of RGB, and verifying that a button text-on-background contrast meets WCAG AA before pushing the change. Saved palettes can be exported as a JSON or CSS-variable snippet so the colors you sketch in the picker travel cleanly into your codebase. Because every conversion and contrast computation runs in the browser, your color tokens — which often originate in confidential brand work or unreleased product UI — never leave your device, and the tool is fully usable offline once the page has loaded.
Paste the hex value into DevStudio Color Picker — for example #336699 — and the tool immediately shows the equivalent HSL string, hsl(210, 50%, 40%). The conversion is bidirectional: edit any field and the others update automatically. The picker also produces RGB, OKLCH, and OKLab forms in the same output, so you can copy whichever notation matches your stylesheet without having to compute the conversion by hand.
OKLCH is a color notation defined relative to the Oklab perceptually uniform color space, with lightness, chroma, and hue components. Unlike HSL, where two colors with the same lightness can look very different in perceived brightness, OKLCH treats lightness perceptually so a palette of equally-lit colors actually looks equally lit. It is the recommended notation for building accessible, balanced design systems, and modern browsers support it natively in CSS.
Pick a foreground and a background color in DevStudio Color Picker and the tool calculates the WCAG 2 contrast ratio and labels it Fail, AA Large, AA, or AAA based on the official thresholds. AA requires a ratio of 4.5 to 1 for body text and 3 to 1 for large text or UI elements; AAA requires 7 to 1 and 4.5 to 1 respectively. The newer APCA estimate is shown alongside for projects targeting WCAG 3.
WCAG 2 defines two contrast tiers. AA is the baseline most regulations require, with a minimum ratio of 4.5 to 1 for normal text and 3 to 1 for large or bold text and meaningful UI components. AAA is the more stringent tier, with 7 to 1 and 4.5 to 1 minimums respectively, recommended for content where readability is critical such as long-form articles or government services. AA passes most legal requirements; AAA goes beyond them.
No. DevStudio Color Picker computes every conversion, contrast ratio, and palette transformation locally in your browser. Color values, palettes, and any imported tokens stay on your device — there is no upload, no telemetry on the values, and no third-party script that reads the input. This matters when you are working on confidential brand colors or unreleased product palettes that should not be transmitted to an external service.