#231F4C
Closest named color: Oxford Blue (#1B263B). oklch(27.1% 0.08 283.7), rgb(35, 31, 76).
Aa
White text reads best on this color (15.30:1).
About this color
#231F4C is a dark, moderately saturated purple. In OKLCH its lightness is 27%, its chroma 0.080 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.044 away. White text reads best on it, at 15.30:1.
| Hue family | Purples |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.37:1 |
| White text | 15.30:1 |
Values
| HEX | #231F4C |
| RGB | rgb(35, 31, 76) |
| HSL | hsl(245, 42%, 21%) |
| OKLCH | oklch(27.1% 0.08 283.7) |
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 #231F4C | 15.30:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #231F4C | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #231F4C text on white | 15.30:1 | AAA | Lc 102.1 | Preferred for body text |
| #231F4C text on black | 1.37:1 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E7E8FC
oklch(93.6% 0.027 283.6)
-
Step 200
200
#D4D5FC
oklch(88.5% 0.053 284.1)
-
Step 300
300
#B8B9FD
oklch(80.9% 0.096 283.4)
-
Step 400
400
#9691FB
oklch(70.6% 0.152 283.9)
-
Step 500
500
#7F72F9
oklch(63.2% 0.194 283.7)
-
Step 600
600
#6A55E8
oklch(55.6% 0.212 283.6)
-
Step 700
700
#5944C9
oklch(49% 0.196 283.7)
-
Step 800
800
#4839A3
oklch(42.6% 0.163 283.5)
-
Step 900
900
#3C3381
oklch(37.7% 0.127 283.8)
-
Step 950
950 (this color)
#231F4C
oklch(27.1% 0.08 283.7)
#231F4C 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) | #07274E | 0.039 |
| Deuteranopia (no green cones) | #05244B | 0.039 |
| Tritanopia (no blue cones) | #142932 | 0.068 |
| Achromatopsia (no color) | #252525 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #231F4C
#231F4C
oklch(27.1% 0.08 283.7)
- #2C2800
#2C2800
oklch(27.3% 0.057 103.8)
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 #231F4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.044
- Dark Indigo #1F0954 ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.054
- Dark #1B2431 ΔE 0.058
- Marine #042E60 ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.067
- Dark Purple #35063E ΔE 0.068
- Midnight Blue #191970 ΔE 0.069
Use #231F4C 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.