#231B3F
Closest named color: Oxford Blue (#1B263B). oklch(25.2% 0.066 291.2), rgb(35, 27, 63).
Aa
White text reads best on this color (16.15:1).
About this color
#231B3F is a dark, muted purple. In OKLCH its lightness is 25%, its chroma 0.066 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.039 away. White text reads best on it, at 16.15:1.
| Hue family | Purples |
| Lightness | dark (25%) |
| Chroma | muted (0.066) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.15:1 |
Values
| HEX | #231B3F |
| RGB | rgb(35, 27, 63) |
| HSL | hsl(253, 40%, 18%) |
| OKLCH | oklch(25.2% 0.066 291.2) |
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 #231B3F | 16.15:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #231B3F | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #231B3F text on white | 16.15:1 | AAA | Lc 103.0 | Preferred for body text |
| #231B3F 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D9D5F4
oklch(88.6% 0.042 291.4)
-
Step 300
300
#C0B8F0
oklch(80.8% 0.079 291.1)
-
Step 400
400
#A192E8
oklch(70.7% 0.124 290.9)
-
Step 500
500
#8C74E1
oklch(63.1% 0.159 291.3)
-
Step 600
600
#775ACF
oklch(55.6% 0.173 291.1)
-
Step 700
700
#6449B3
oklch(49.1% 0.161 291)
-
Step 800
800
#523D91
oklch(42.8% 0.133 291.3)
-
Step 900
900
#433574
oklch(37.8% 0.104 290.8)
-
Step 950
950 (this color)
#231B3F
oklch(25.2% 0.066 291.2)
#231B3F 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) | #0D2140 | 0.036 |
| Deuteranopia (no green cones) | #0E203E | 0.035 |
| Tritanopia (no blue cones) | #1C222A | 0.053 |
| Achromatopsia (no color) | #212121 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231B3F
#231B3F
oklch(25.2% 0.066 291.2)
- #232400
#232400
oklch(25.1% 0.055 111.3)
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 #231B3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.039
- Dark #1B2431 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.057
- Dark Purple #35063E ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.058
- Jet #212529 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.060
- Eggplant #380835 ΔE 0.061
Use #231B3F 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.