#231B4E
Closest named color: Dark Indigo (#1F0954). oklch(26.5% 0.09 285.7), rgb(35, 27, 78).
Aa
White text reads best on this color (15.69:1).
About this color
#231B4E is a dark, moderately saturated purple. In OKLCH its lightness is 26%, its chroma 0.090 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.041 away. White text reads best on it, at 15.69:1.
| Hue family | Purples |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.33:1 |
| White text | 15.69:1 |
Values
| HEX | #231B4E |
| RGB | rgb(35, 27, 78) |
| HSL | hsl(249, 49%, 21%) |
| OKLCH | oklch(26.5% 0.09 285.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #231B4E | 15.69:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #231B4E | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #231B4E text on white | 15.69:1 | AAA | Lc 102.4 | Preferred for body text |
| #231B4E text on black | 1.33:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 950.
-
Step 50
50
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E7FE
oklch(93.5% 0.031 285.8)
-
Step 200
200
#D5D4FF
oklch(88.5% 0.059 286.2)
-
Step 300
300
#BAB8FF
oklch(81% 0.1 285.2)
-
Step 400
400
#998FFF
oklch(70.7% 0.16 285.6)
-
Step 500
500
#836DFF
oklch(63.1% 0.208 285.7)
-
Step 600
600
#704BF4
oklch(55.6% 0.237 285.8)
-
Step 700
700
#5E3AD4
oklch(49% 0.22 285.7)
-
Step 800
800
#4C32AC
oklch(42.7% 0.183 285.4)
-
Step 900
900
#3F2E88
oklch(37.7% 0.143 286)
-
Step 950
950 (this color)
#231B4E
oklch(26.5% 0.09 285.7)
#231B4E with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #002550 | 0.047 |
| Deuteranopia (no green cones) | #00224D | 0.046 |
| Tritanopia (no blue cones) | #132731 | 0.076 |
| Achromatopsia (no color) | #232323 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B4E
#231B4E
oklch(26.5% 0.09 285.7)
- #292600
#292600
oklch(26.3% 0.056 105.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #231B4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.041
- Oxford Blue #1B263B ΔE 0.054
- Dark Purple #35063E ΔE 0.063
- Midnight Blue #191970 ΔE 0.064
- Marine #042E60 ΔE 0.065
- Space Cadet #2B2D42 ΔE 0.066
- Dark #1B2431 ΔE 0.067
- Navy Blue #001146 ΔE 0.068
Use #231B4E in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.