#231B43
Closest named color: Oxford Blue (#1B263B). oklch(25.6% 0.073 289.4), rgb(35, 27, 67).
Aa
White text reads best on this color (16.03:1).
About this color
#231B43 is a dark, moderately saturated purple. In OKLCH its lightness is 26%, its chroma 0.073 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.042 away. White text reads best on it, at 16.03:1.
| Hue family | Purples |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.03:1 |
Values
| HEX | #231B43 |
| RGB | rgb(35, 27, 67) |
| HSL | hsl(252, 43%, 18%) |
| OKLCH | oklch(25.6% 0.073 289.4) |
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 #231B43 | 16.03:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #231B43 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #231B43 text on white | 16.03:1 | AAA | Lc 102.9 | Preferred for body text |
| #231B43 text on black | 1.30:1 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E7FA
oklch(93.5% 0.026 290.7)
-
Step 200
200
#D8D5F7
oklch(88.6% 0.047 289.5)
-
Step 300
300
#BFB8F5
oklch(81% 0.086 289.6)
-
Step 400
400
#9F90F0
oklch(70.6% 0.138 289.5)
-
Step 500
500
#8A72EB
oklch(63.2% 0.175 289.5)
-
Step 600
600
#7556D9
oklch(55.5% 0.191 289.6)
-
Step 700
700
#6346BC
oklch(49.2% 0.177 289.6)
-
Step 800
800
#503A98
oklch(42.6% 0.147 289.5)
-
Step 900
900
#423379
oklch(37.7% 0.115 289.6)
-
Step 950
950 (this color)
#231B43
oklch(25.6% 0.073 289.4)
#231B43 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) | #092244 | 0.040 |
| Deuteranopia (no green cones) | #092042 | 0.039 |
| Tritanopia (no blue cones) | #1A232C | 0.058 |
| Achromatopsia (no color) | #212121 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B43
#231B43
oklch(25.6% 0.073 289.4)
- #252500
#252500
oklch(25.6% 0.056 109.8)
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 #231B43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.042
- Dark #1B2431 ΔE 0.051
- Dark Indigo #1F0954 ΔE 0.052
- Dark Purple #35063E ΔE 0.058
- Space Cadet #2B2D42 ΔE 0.061
- Rich Black #0D1B2A ΔE 0.063
- Eggplant #380835 ΔE 0.064
- Midnight Purple #280137 ΔE 0.065
Use #231B43 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.