#231B3A
Closest named color: Oxford Blue (#1B263B). oklch(24.9% 0.058 293.7), rgb(35, 27, 58).
Aa
White text reads best on this color (16.28:1).
About this color
#231B3A is a very dark, muted purple. In OKLCH its lightness is 25%, its chroma 0.058 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.037 away. White text reads best on it, at 16.28:1.
| Hue family | Purples |
| Lightness | very dark (25%) |
| Chroma | muted (0.058) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.28:1 |
Values
| HEX | #231B3A |
| RGB | rgb(35, 27, 58) |
| HSL | hsl(255, 36%, 17%) |
| OKLCH | oklch(24.9% 0.058 293.7) |
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 #231B3A | 16.28:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #231B3A | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #231B3A text on white | 16.28:1 | AAA | Lc 103.2 | Preferred for body text |
| #231B3A 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5F1
oklch(88.6% 0.038 293.8)
-
Step 300
300
#C2B9E9
oklch(80.9% 0.068 293.4)
-
Step 400
400
#A493DE
oklch(70.7% 0.109 293.8)
-
Step 500
500
#8F77D5
oklch(63.2% 0.139 293.8)
-
Step 600
600
#795DC2
oklch(55.5% 0.152 293.6)
-
Step 700
700
#664CA8
oklch(49% 0.142 293.5)
-
Step 800
800
#533F88
oklch(42.6% 0.117 293.4)
-
Step 900
900
#45366D
oklch(37.7% 0.092 294.1)
-
Step 950
950 (this color)
#231B3A
oklch(24.9% 0.058 293.7)
#231B3A 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) | #11203B | 0.032 |
| Deuteranopia (no green cones) | #122039 | 0.031 |
| Tritanopia (no blue cones) | #1E2127 | 0.047 |
| Achromatopsia (no color) | #202020 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B3A
#231B3A
oklch(24.9% 0.058 293.7)
- #212400
#212400
oklch(24.9% 0.056 114.4)
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 #231B3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.037
- Dark #1B2431 ΔE 0.040
- Rich Black #0D1B2A ΔE 0.050
- Jet #212529 ΔE 0.053
- Dark Purple #35063E ΔE 0.060
- Eggplant #380835 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.061
- Midnight Purple #280137 ΔE 0.064
Use #231B3A 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.