#231B37
Closest named color: Oxford Blue (#1B263B). oklch(24.7% 0.053 295.4), rgb(35, 27, 55).
Aa
White text reads best on this color (16.36:1).
About this color
#231B37 is a very dark, muted purple. In OKLCH its lightness is 25%, its chroma 0.053 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.036 away. White text reads best on it, at 16.36:1.
| Hue family | Purples |
| Lightness | very dark (25%) |
| Chroma | muted (0.053) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.36:1 |
Values
| HEX | #231B37 |
| RGB | rgb(35, 27, 55) |
| HSL | hsl(257, 34%, 16%) |
| OKLCH | oklch(24.7% 0.053 295.4) |
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 #231B37 | 16.36:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #231B37 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #231B37 text on white | 16.36:1 | AAA | Lc 103.3 | Preferred for body text |
| #231B37 text on black | 1.28:1 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#DAD5EE
oklch(88.5% 0.034 294.9)
-
Step 300
300
#C3B9E5
oklch(80.9% 0.062 295.4)
-
Step 400
400
#A594D8
oklch(70.7% 0.099 295.2)
-
Step 500
500
#9078CE
oklch(63.1% 0.128 295.3)
-
Step 600
600
#7B5FBA
oklch(55.5% 0.138 295.8)
-
Step 700
700
#684EA1
oklch(49.1% 0.13 295.7)
-
Step 800
800
#544182
oklch(42.7% 0.105 295)
-
Step 900
900
#453768
oklch(37.6% 0.083 295.3)
-
Step 950
950 (this color)
#231B37
oklch(24.7% 0.053 295.4)
#231B37 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) | #122038 | 0.031 |
| Deuteranopia (no green cones) | #141F36 | 0.028 |
| Tritanopia (no blue cones) | #1F2026 | 0.042 |
| Achromatopsia (no color) | #202020 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B37
#231B37
oklch(24.7% 0.053 295.4)
- #202402
#202402
oklch(24.8% 0.054 116)
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 #231B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Dark #1B2431 ΔE 0.037
- Rich Black #0D1B2A ΔE 0.047
- Jet #212529 ΔE 0.049
- Eggplant #380835 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.061
- Dark Purple #35063E ΔE 0.061
- Midnight Purple #280137 ΔE 0.065
Use #231B37 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.