Color #00211D Color / Colour Code #00211D
This page shows the hex color code for color #00211d (#00211D). The colour is a cyan tone with 100% saturation and 6% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #00211D against common backgrounds.
Complementary Colors
#00211D paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 143, 173, and 203 degrees for harmonious combinations.
Triadic Palette
Three colors at 173, 293, and 53 degrees.
Color Palettes Using #00211D
Five shades at lightness levels 15% through 85% while keeping hue at 173 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 173 to 218 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 173 with its complement at 353 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 #00211D
Lightness variations at hue 173 and 100% saturation.
CSS Gradients with #00211D
Design Use Cases for #00211D
High-Impact Accent
With 100% saturation, #00211D 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.
Dark Mode Background
At just 6% lightness, #00211D 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.
Clarity & Technology
#00211D is in the cyan spectrum (hue 173). Cyan evokes technology, clarity, and innovation. It works well for tech product interfaces, data visualization accents, loading indicators, and futuristic design themes. Cyan provides a modern alternative to traditional blues.
Gradient Pairing
Create a gradient from #00211D (hue 173) to its complement at hue 353. For a subtler effect, try pairing with an analogous color at hue 203. Use CSS: background: linear-gradient(135deg, #00211d, #1f0004);
CSS Code for #00211D
Similar Colors
Colors visually similar to #00211D based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #00211D across image editing and color design tools.
About Color #00211D (#00211D)
#00211D is a cyan color (colour) with RGB channel values of 0 red, 33 green, and 29 blue. The green channel is dominant by a ratio of 33.0:1 over the weakest channel. In HSL terms, the hue sits at 173 degrees with 100% saturation and 6% lightness, placing it in the neutral-to-cool range of the colour spectrum.
The perceived brightness of #00211D is 23/255 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 100% cyan, 0% magenta, 12% yellow, and 87% key (black).
The WCAG contrast ratio of #00211D against white is 17.00:1 and against black is 1.24:1. 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 #1F0004 creates maximum visual tension when paired with #00211D. For more harmonious color combinations, use the analogous colours #001F0C and #00131F, 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 #00211D
- 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 #00211D?
- #00211D is Color #00211D, a cyan color (colour) with RGB(0, 33, 29), HSL(173, 100%, 6%), and CMYK(100%, 0%, 12%, 87%). Its perceived brightness is 23/255.
- Is #00211D accessible for text?
- Against white, #00211D has a contrast ratio of 17.00:1 (passes AA for normal text). Against black, it has 1.24:1 (fails AA). Use the contrast checker tool for custom background pairings.
- What colours pair well with #00211D?
- The complementary colour is #1F0004 (hue 353). For subtle color combinations, use analogous colours #001F0C and #00131F. The triadic palette adds #1B001F and #1F1B00 for vibrant variety.
- How do I use #00211D in CSS?
- Use any format: color: #00211d; or rgb(0, 33, 29); or hsl(173, 100%, 6%). For CSS custom properties: --color-primary: 173 100% 6%; 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.