Color #A21639 Color / Colour Code #A21639
This page shows the hex color code for color #a21639 (#A21639). The colour is a red tone with 76% saturation and 36% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #A21639 against common backgrounds.
Complementary Colors
#A21639 paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 315, 345, and 15 degrees for harmonious combinations.
Triadic Palette
Three colors at 345, 105, and 225 degrees.
Color Palettes Using #A21639
Five shades at lightness levels 15% through 85% while keeping hue at 345 and saturation at 76%. Use the darkest shade for text and the lightest for backgrounds to build a cohesive single-hue design system.
Adjacent hues from 345 to 30 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 345 with its complement at 165 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 #A21639
Lightness variations at hue 345 and 76% saturation.
CSS Gradients with #A21639
Design Use Cases for #A21639
Vibrant Brand Color
#A21639 has a strong 76% 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.
Primary Interface Color
At 36% lightness, #A21639 is in the mid-range, making it ideal for interactive elements like buttons, links, and selected states. This lightness level ensures good contrast against both light and dark adjacent elements in most layouts.
Urgency & Energy Signaling
#A21639 falls in the red spectrum (hue 345). Red triggers urgency and excitement, making it effective for sale badges, countdown timers, error messages, and "limited time" labels. In data visualization, use it to flag negative values or critical thresholds.
Gradient Pairing
Create a gradient from #A21639 (hue 345) to its complement at hue 165. For a subtler effect, try pairing with an analogous color at hue 15. Use CSS: background: linear-gradient(135deg, #a21639, #16a27f);
CSS Code for #A21639
Similar Colors
Colors visually similar to #A21639 based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #A21639 across image editing and color design tools.
About Color #A21639 (#A21639)
#A21639 is a red color (colour) with RGB channel values of 162 red, 22 green, and 57 blue. The red channel is dominant by a ratio of 7.4:1 over the weakest channel. In HSL terms, the hue sits at 345 degrees with 76% saturation and 36% lightness, placing it in the warm range of the colour spectrum.
The perceived brightness of #A21639 is 68/255 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 0% cyan, 86% magenta, 65% yellow, and 36% key (black).
The WCAG contrast ratio of #A21639 against white is 7.75:1 and against black is 2.71:1. 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 #16A27F creates maximum visual tension when paired with #A21639. For more harmonious color combinations, use the analogous colours #A2167F and #A23916, 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 #A21639
- 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 #A21639?
- #A21639 is Color #A21639, a red color (colour) with RGB(162, 22, 57), HSL(345, 76%, 36%), and CMYK(0%, 86%, 65%, 36%). Its perceived brightness is 68/255.
- Is #A21639 accessible for text?
- Against white, #A21639 has a contrast ratio of 7.75:1 (passes AA for normal text). Against black, it has 2.71:1 (fails AA). Use the contrast checker tool for custom background pairings.
- What colours pair well with #A21639?
- The complementary colour is #16A27F (hue 165). For subtle color combinations, use analogous colours #A2167F and #A23916. The triadic palette adds #39A216 and #1639A2 for vibrant variety.
- How do I use #A21639 in CSS?
- Use any format: color: #a21639; or rgb(162, 22, 57); or hsl(345, 76%, 36%). For CSS custom properties: --color-primary: 345 76% 36%; 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.