Color #FF3904 Color / Colour Code #FF3904
This page shows the hex color code for color #ff3904 (#FF3904). The colour is a red tone with 100% saturation and 51% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #FF3904 against common backgrounds.
Complementary Colors
#FF3904 paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 343, 13, and 43 degrees for harmonious combinations.
Triadic Palette
Three colors at 13, 133, and 253 degrees.
Color Palettes Using #FF3904
Five shades at lightness levels 15% through 85% while keeping hue at 13 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 13 to 58 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 13 with its complement at 193 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 #FF3904
Lightness variations at hue 13 and 100% saturation.
CSS Gradients with #FF3904
Design Use Cases for #FF3904
High-Impact Accent
With 100% saturation, #FF3904 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 51% lightness, #FF3904 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
#FF3904 falls in the red spectrum (hue 13). 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 #FF3904 (hue 13) to its complement at hue 193. For a subtler effect, try pairing with an analogous color at hue 43. Use CSS: background: linear-gradient(135deg, #ff3904, #05c9ff);
CSS Code for #FF3904
Similar Colors
Colors visually similar to #FF3904 based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #FF3904 across image editing and color design tools.
About Color #FF3904 (#FF3904)
#FF3904 is a red color (colour) with RGB channel values of 255 red, 57 green, and 4 blue. The red channel is dominant by a ratio of 63.8:1 over the weakest channel. In HSL terms, the hue sits at 13 degrees with 100% saturation and 51% lightness, placing it in the warm range of the colour spectrum.
The perceived brightness of #FF3904 is 110/255 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, 78% magenta, 98% yellow, and 0% key (black).
The WCAG contrast ratio of #FF3904 against white is 3.60:1 and against black is 5.84:1. 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 5.84:1.
The complementary colour #05C9FF creates maximum visual tension when paired with #FF3904. For more harmonious color combinations, use the analogous colours #FF054C and #FFB805, 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 #FF3904
- 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 #FF3904?
- #FF3904 is Color #FF3904, a red color (colour) with RGB(255, 57, 4), HSL(13, 100%, 51%), and CMYK(0%, 78%, 98%, 0%). Its perceived brightness is 110/255.
- Is #FF3904 accessible for text?
- Against white, #FF3904 has a contrast ratio of 3.60:1 (fails AA for normal text). Against black, it has 5.84:1 (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 #FF3904?
- The complementary colour is #05C9FF (hue 193). For subtle color combinations, use analogous colours #FF054C and #FFB805. The triadic palette adds #05FF3B and #3B05FF for vibrant variety.
- How do I use #FF3904 in CSS?
- Use any format: color: #ff3904; or rgb(255, 57, 4); or hsl(13, 100%, 51%). For CSS custom properties: --color-primary: 13 100% 51%; 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.