Color #3900BB Color / Colour Code #3900BB
This page shows the hex color code for color #3900bb (#3900BB). The colour is a purple tone with 100% saturation and 37% lightness. Explore its conversions, colour palettes, gradients, accessibility data, and CSS code below.
Color Conversions
Accessibility Contrast
WCAG contrast ratios for #3900BB against common backgrounds.
Complementary Colors
#3900BB paired with its color wheel opposite for maximum contrast.
Analogous Colors
Hues at 228, 258, and 288 degrees for harmonious combinations.
Triadic Palette
Three colors at 258, 18, and 138 degrees.
Color Palettes Using #3900BB
Five shades at lightness levels 15% through 85% while keeping hue at 258 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 258 to 303 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 258 with its complement at 78 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 #3900BB
Lightness variations at hue 258 and 100% saturation.
CSS Gradients with #3900BB
Design Use Cases for #3900BB
High-Impact Accent
With 100% saturation, #3900BB 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.
Primary Interface Color
At 37% lightness, #3900BB 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.
Creativity & Premium Positioning
#3900BB falls in the purple spectrum (hue 258). Purple communicates creativity, wisdom, and luxury. It is effective for premium product highlights, creative portfolio accents, meditation app interfaces, and rewards program branding. Purple occupies a unique space between the energy of red and the calm of blue.
Gradient Pairing
Create a gradient from #3900BB (hue 258) to its complement at hue 78. For a subtler effect, try pairing with an analogous color at hue 288. Use CSS: background: linear-gradient(135deg, #3900bb, #84bd00);
CSS Code for #3900BB
Similar Colors
Colors visually similar to #3900BB based on RGB, lightness, and hue variations.
Use This Color in Design Tools
Apply #3900BB across image editing and color design tools.
About Color #3900BB (#3900BB)
#3900BB is a purple color (colour) with RGB channel values of 57 red, 0 green, and 187 blue. The blue channel is dominant by a ratio of 187.0:1 over the weakest channel. In HSL terms, the hue sits at 258 degrees with 100% saturation and 37% lightness, placing it in the cool range of the colour spectrum.
The perceived brightness of #3900BB is 38/255 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 70% cyan, 100% magenta, 0% yellow, and 27% key (black).
The WCAG contrast ratio of #3900BB against white is 11.10:1 and against black is 1.89:1. 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 #84BD00 creates maximum visual tension when paired with #3900BB. For more harmonious color combinations, use the analogous colours #0026BD and #9700BD, 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 #3900BB
- 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 #3900BB?
- #3900BB is Color #3900BB, a purple color (colour) with RGB(57, 0, 187), HSL(258, 100%, 37%), and CMYK(70%, 100%, 0%, 27%). Its perceived brightness is 38/255.
- Is #3900BB accessible for text?
- Against white, #3900BB has a contrast ratio of 11.10:1 (passes AA for normal text). Against black, it has 1.89:1 (fails AA). Use the contrast checker tool for custom background pairings.
- What colours pair well with #3900BB?
- The complementary colour is #84BD00 (hue 78). For subtle color combinations, use analogous colours #0026BD and #9700BD. The triadic palette adds #BD3900 and #00BD39 for vibrant variety.
- How do I use #3900BB in CSS?
- Use any format: color: #3900bb; or rgb(57, 0, 187); or hsl(258, 100%, 37%). For CSS custom properties: --color-primary: 258 100% 37%; 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.