Color #100B31 Color / Colour Code #100B31
This page shows the hex color code for color #100b31 (#100B31). The colour is a blue tone with 63% saturation and 12% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #100B31 against common backgrounds.
Complementary Colors
#100B31 paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 218, 248, and 278 degrees for harmonious combinations.
Triadic Palette
Three colors at 248, 8, and 128 degrees.
Color Palettes Using #100B31
Five shades at lightness levels 15% through 85% while keeping hue at 248 and saturation at 63%. Use the darkest shade for text and the lightest for backgrounds to build a cohesive single-hue design system.
Adjacent hues from 248 to 293 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 248 with its complement at 68 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 #100B31
Lightness variations at hue 248 and 63% saturation.
CSS Gradients with #100B31
Design Use Cases for #100B31
Vibrant Brand Color
#100B31 has a strong 63% saturation that makes it ideal for brand identity elements. Use it for logos, primary call-to-action buttons, hero section accents, and marketing materials where visual impact matters. This saturation level is eye-catching without being harsh.
Dark Mode Background
At just 12% lightness, #100B31 works as a dark mode background or overlay color. Dark backgrounds reduce eye strain in low-light environments and make bright accent colors pop. Pair with light text (minimum 4.5:1 contrast ratio) for readability.
Trust & Professional Identity
#100B31 sits in the blue range (hue 248). 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 #100B31 (hue 248) to its complement at hue 68. For a subtler effect, try pairing with an analogous color at hue 278. Use CSS: background: linear-gradient(135deg, #100b31, #2d320b);
CSS Code for #100B31
Similar Colors
Colors visually similar to #100B31 based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #100B31 across image editing and color design tools.
About Color #100B31 (#100B31)
#100B31 is a blue color (colour) with RGB channel values of 16 red, 11 green, and 49 blue. The blue channel is dominant by a ratio of 4.5:1 over the weakest channel. In HSL terms, the hue sits at 248 degrees with 63% saturation and 12% lightness, placing it in the cool range of the colour spectrum.
The perceived brightness of #100B31 is 17/255 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 67% cyan, 78% magenta, 0% yellow, and 81% key (black).
The WCAG contrast ratio of #100B31 against white is 18.85:1 and against black is 1.11:1. This exceeds the AAA requirement (7:1) for normal text on white, making it excellent for body text and small UI labels on light backgrounds.
The complementary colour #2D320B creates maximum visual tension when paired with #100B31. For more harmonious color combinations, use the analogous colours #0B1932 and #240B32, 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 #100B31
- 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 #100B31?
- #100B31 is Color #100B31, a blue color (colour) with RGB(16, 11, 49), HSL(248, 63%, 12%), and CMYK(67%, 78%, 0%, 81%). Its perceived brightness is 17/255.
- Is #100B31 accessible for text?
- Against white, #100B31 has a contrast ratio of 18.85:1 (passes AA for normal text). Against black, it has 1.11:1 (fails AA). Use the contrast checker tool for custom background pairings.
- What colours pair well with #100B31?
- The complementary colour is #2D320B (hue 68). For subtle color combinations, use analogous colours #0B1932 and #240B32. The triadic palette adds #32100B and #0B3210 for vibrant variety.
- How do I use #100B31 in CSS?
- Use any format: color: #100b31; or rgb(16, 11, 49); or hsl(248, 63%, 12%). For CSS custom properties: --color-primary: 248 63% 12%; 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.