#231B4B
Closest named color: Dark Indigo (#1F0954). oklch(26.2% 0.085 286.6), rgb(35, 27, 75).
Aa
White text reads best on this color (15.79:1).
About this color
#231B4B is a dark, moderately saturated purple. In OKLCH its lightness is 26%, its chroma 0.085 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.043 away. White text reads best on it, at 15.79:1.
| Hue family | Purples |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.32:1 |
| White text | 15.79:1 |
Values
| HEX | #231B4B |
| RGB | rgb(35, 27, 75) |
| HSL | hsl(250, 47%, 20%) |
| OKLCH | oklch(26.2% 0.085 286.6) |
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 #231B4B | 15.79:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #231B4B | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #231B4B text on white | 15.79:1 | AAA | Lc 102.5 | Preferred for body text |
| #231B4B text on black | 1.32:1 | 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
#F4F4FE
oklch(97% 0.013 286.1)
-
Step 100
100
#E8E7FD
oklch(93.5% 0.03 287.9)
-
Step 200
200
#D6D4FD
oklch(88.5% 0.056 287.4)
-
Step 300
300
#BBB7FF
oklch(80.9% 0.101 286.5)
-
Step 400
400
#9B8EFF
oklch(70.7% 0.161 286.8)
-
Step 500
500
#856DFD
oklch(63.1% 0.206 286.6)
-
Step 600
600
#714FED
oklch(55.7% 0.225 286.5)
-
Step 700
700
#5F3ECE
oklch(49.1% 0.209 286.4)
-
Step 800
800
#4D34A6
oklch(42.6% 0.173 286.6)
-
Step 900
900
#3F3084
oklch(37.7% 0.135 286.2)
-
Step 950
950 (this color)
#231B4B
oklch(26.2% 0.085 286.6)
#231B4B 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) | #00244D | 0.047 |
| Deuteranopia (no green cones) | #00214A | 0.046 |
| Tritanopia (no blue cones) | #152630 | 0.071 |
| Achromatopsia (no color) | #232323 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B4B
#231B4B
oklch(26.2% 0.085 286.6)
- #282600
#282600
oklch(26.2% 0.056 106.7)
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 #231B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.050
- Dark Purple #35063E ΔE 0.061
- Dark #1B2431 ΔE 0.063
- Space Cadet #2B2D42 ΔE 0.064
- Navy Blue #001146 ΔE 0.067
- Marine #042E60 ΔE 0.067
- Deep Purple #36013F ΔE 0.068
Use #231B4B 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.