#231D40
Closest named color: Oxford Blue (#1B263B). oklch(25.8% 0.064 289), rgb(35, 29, 64).
Aa
White text reads best on this color (15.89:1).
About this color
#231D40 is a dark, muted purple. In OKLCH its lightness is 26%, its chroma 0.064 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.034 away. White text reads best on it, at 15.89:1.
| Hue family | Purples |
| Lightness | dark (26%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.32:1 |
| White text | 15.89:1 |
Values
| HEX | #231D40 |
| RGB | rgb(35, 29, 64) |
| HSL | hsl(250, 38%, 18%) |
| OKLCH | oklch(25.8% 0.064 289) |
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 #231D40 | 15.89:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #231D40 | 1.32:1 | Fails | Lc 0.0 | Not readable |
| #231D40 text on white | 15.89:1 | AAA | Lc 102.8 | Preferred for body text |
| #231D40 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D8D5F4
oklch(88.5% 0.042 289.9)
-
Step 300
300
#BEB9EF
oklch(80.8% 0.076 288.8)
-
Step 400
400
#9E93E7
oklch(70.6% 0.121 288.9)
-
Step 500
500
#8876E0
oklch(63.1% 0.155 289)
-
Step 600
600
#735CCE
oklch(55.5% 0.169 289)
-
Step 700
700
#614BB2
oklch(49.1% 0.157 289.1)
-
Step 800
800
#4F3E90
oklch(42.6% 0.13 289.2)
-
Step 900
900
#413673
oklch(37.7% 0.101 288.9)
-
Step 950
950 (this color)
#231D40
oklch(25.8% 0.064 289)
#231D40 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) | #102341 | 0.032 |
| Deuteranopia (no green cones) | #10213F | 0.031 |
| Tritanopia (no blue cones) | #1B242B | 0.053 |
| Achromatopsia (no color) | #222222 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231D40
#231D40
oklch(25.8% 0.064 289)
- #262500
#262500
oklch(25.7% 0.056 108.2)
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 #231D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.034
- Dark #1B2431 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.055
- Jet #212529 ΔE 0.057
- Rich Black #0D1B2A ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.061
- Dark Purple #35063E ΔE 0.062
- Eggplant #380835 ΔE 0.065
Use #231D40 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.