Color #FF003B Color / Colour Code #FF003B
This page shows the hex color code for color #ff003b (#FF003B). The colour is a red tone with 100% saturation and 50% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #FF003B against common backgrounds.
Complementary Colors
#FF003B paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 316, 346, and 16 degrees for harmonious combinations.
Triadic Palette
Three colors at 346, 106, and 226 degrees.
Color Palettes Using #FF003B
Five shades at lightness levels 15% through 85% while keeping hue at 346 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 346 to 31 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 346 with its complement at 166 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 #FF003B
Lightness variations at hue 346 and 100% saturation.
CSS Gradients with #FF003B
Design Use Cases for #FF003B
High-Impact Accent
With 100% saturation, #FF003B 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 50% lightness, #FF003B 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.
Urgency & Energy Signaling
#FF003B falls in the red spectrum (hue 346). 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 #FF003B (hue 346) to its complement at hue 166. For a subtler effect, try pairing with an analogous color at hue 16. Use CSS: background: linear-gradient(135deg, #ff003b, #00ffc4);
CSS Code for #FF003B
Similar Colors
Colors visually similar to #FF003B based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #FF003B across image editing and color design tools.
About Color #FF003B (#FF003B)
#FF003B is a red color (colour) with RGB channel values of 255 red, 0 green, and 59 blue. The red channel is dominant by a ratio of 255.0:1 over the weakest channel. In HSL terms, the hue sits at 346 degrees with 100% saturation and 50% lightness, placing it in the warm range of the colour spectrum.
The perceived brightness of #FF003B is 83/255 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, 100% magenta, 77% yellow, and 0% key (black).
The WCAG contrast ratio of #FF003B against white is 3.95:1 and against black is 5.32:1. This only passes AA for large text (18pt+) on white. For normal body text on white, darken the color or use it on a dark background where it achieves 5.32:1.
The complementary colour #00FFC4 creates maximum visual tension when paired with #FF003B. For more harmonious color combinations, use the analogous colours #FF00BB and #FF4400, 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 #FF003B
- 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 #FF003B?
- #FF003B is Color #FF003B, a red color (colour) with RGB(255, 0, 59), HSL(346, 100%, 50%), and CMYK(0%, 100%, 77%, 0%). Its perceived brightness is 83/255.
- Is #FF003B accessible for text?
- Against white, #FF003B has a contrast ratio of 3.95:1 (fails AA for normal text). Against black, it has 5.32:1 (passes AA). It passes AA for large text (18pt+) on white. Use the contrast checker tool for custom background pairings.
- What colours pair well with #FF003B?
- The complementary colour is #00FFC4 (hue 166). For subtle color combinations, use analogous colours #FF00BB and #FF4400. The triadic palette adds #3BFF00 and #003BFF for vibrant variety.
- How do I use #FF003B in CSS?
- Use any format: color: #ff003b; or rgb(255, 0, 59); or hsl(346, 100%, 50%). For CSS custom properties: --color-primary: 346 100% 50%; 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.