Color #663DFF Color / Colour Code #663DFF
This page shows the hex color code for color #663dff (#663DFF). The colour is a blue tone with 100% saturation and 62% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #663DFF against common backgrounds.
Complementary Colors
#663DFF paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 223, 253, and 283 degrees for harmonious combinations.
Triadic Palette
Three colors at 253, 13, and 133 degrees.
Color Palettes Using #663DFF
Five shades at lightness levels 15% through 85% while keeping hue at 253 and saturation at 100%. Use the darkest shade for text and the lightest for backgrounds to build a cohesive single-hue design system.
Adjacent hues from 253 to 298 degrees create a warm, unified palette. This analogous scheme works for marketing materials, seasonal campaigns, and any design that needs visual warmth without clashing colors.
Combines the base color at hue 253 with its complement at 73 and two adjacent cool tones. This split-complementary approach provides strong visual contrast while remaining more balanced than a pure complementary scheme.
Five evenly spaced hues at 40% saturation and 80% lightness. Pastels are gentle on the eyes and work well for dashboards, onboarding screens, category tags, and any interface where multiple distinct colors are needed without visual aggression.
Shades & Tints of #663DFF
Lightness variations at hue 253 and 100% saturation.
CSS Gradients with #663DFF
Design Use Cases for #663DFF
High-Impact Accent
With 100% saturation, #663DFF is highly vivid. Reserve this for elements that need maximum attention: primary action buttons, notification badges, error states, or promotional banners. Use sparingly alongside neutral tones to avoid visual fatigue.
Soft Accent & Highlight
With 62% lightness, #663DFF has a softer, more approachable quality. It works well for hover states, subtle highlights, progress indicators, and secondary UI elements. This lightness range is particularly effective for tag backgrounds and status indicators.
Trust & Professional Identity
#663DFF sits in the blue range (hue 253). Blue is the world's most popular color for corporate identities because it conveys trust, stability, and competence. Use it for navigation bars, link text, form focus states, and any element where user confidence matters. Financial, healthcare, and technology brands rely heavily on this hue range.
Gradient Pairing
Create a gradient from #663DFF (hue 253) to its complement at hue 73. For a subtler effect, try pairing with an analogous color at hue 283. Use CSS: background: linear-gradient(135deg, #663dff, #d5ff3d);
CSS Code for #663DFF
Similar Colors
Colors visually similar to #663DFF based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #663DFF across image editing and color design tools.
About Color #663DFF (#663DFF)
#663DFF is a blue color (colour) with RGB channel values of 102 red, 61 green, and 255 blue. The blue channel is dominant by a ratio of 4.2:1 over the weakest channel. In HSL terms, the hue sits at 253 degrees with 100% saturation and 62% lightness, placing it in the cool range of the colour spectrum.
The perceived brightness of #663DFF is 95/255 using the ITU-R BT.601 luma formula (0.299R + 0.587G + 0.114B). This appears dark to the human eye, so pair it with light text for adequate readability. For print production, the CMYK equivalent is 60% cyan, 76% magenta, 0% yellow, and 0% key (black).
The WCAG contrast ratio of #663DFF against white is 5.71:1 and against black is 3.68:1. This meets the AA requirement (4.5:1) for normal text on white. For AAA compliance, consider darkening to at least 43% lightness.
The complementary colour #D5FF3D creates maximum visual tension when paired with #663DFF. For more harmonious color combinations, use the analogous colours #3D74FF and #C83DFF, which sit 30 degrees on either side of the hue wheel. To build a complete design system, start with the monochromatic scale above for consistent shade variations, then add one complementary or triadic accent for interactive elements.
How to Explore Color #663DFF
- Enter your color value in HEX format.
- The tool converts it to RGB, HSL, CMYK format in real time.
- Copy the converted value to your clipboard.
What is HEX to RGB, HSL, CMYK color conversion
Converting from HEX to RGB, HSL, CMYK translates a color value between two different color models. Different color models are used in web design (HEX, RGB), print (CMYK), and color theory (HSL, HSV).
Related Tools & Colors
Frequently Asked Questions
- What color / colour is #663DFF?
- #663DFF is Color #663DFF, a blue color (colour) with RGB(102, 61, 255), HSL(253, 100%, 62%), and CMYK(60%, 76%, 0%, 0%). Its perceived brightness is 95/255.
- Is #663DFF accessible for text?
- Against white, #663DFF has a contrast ratio of 5.71:1 (passes AA for normal text). Against black, it has 3.68:1 (fails AA). Use the contrast checker tool for custom background pairings.
- What colours pair well with #663DFF?
- The complementary colour is #D5FF3D (hue 73). For subtle color combinations, use analogous colours #3D74FF and #C83DFF. The triadic palette adds #FF673D and #3DFF67 for vibrant variety.
- How do I use #663DFF in CSS?
- Use any format: color: #663dff; or rgb(102, 61, 255); or hsl(253, 100%, 62%). For CSS custom properties: --color-primary: 253 100% 62%; then use it as hsl(var(--color-primary)).
- Is this color / colour explorer free?
- Yes, completely free with no signup required. All colour calculations run in your browser. You can explore any valid hex color code, not just the pre-generated palette.