#21183C
Closest named color: Oxford Blue (#1B263B). oklch(24.1% 0.067 292.2), rgb(33, 24, 60).
Aa
White text reads best on this color (16.65:1).
About this color
#21183C is a very dark, muted purple. In OKLCH its lightness is 24%, its chroma 0.067 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.046 away. White text reads best on it, at 16.65:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | muted (0.067) |
| Temperature | in between |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.65:1 |
Values
| HEX | #21183C |
| RGB | rgb(33, 24, 60) |
| HSL | hsl(255, 43%, 16%) |
| OKLCH | oklch(24.1% 0.067 292.2) |
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 #21183C | 16.65:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #21183C | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #21183C text on white | 16.65:1 | AAA | Lc 103.5 | Preferred for body text |
| #21183C text on black | 1.26:1 | 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
#EAE7F8
oklch(93.5% 0.023 294.1)
-
Step 200
200
#D9D4F4
oklch(88.4% 0.044 292.6)
-
Step 300
300
#C1B8F0
oklch(80.9% 0.079 291.9)
-
Step 400
400
#A391E8
oklch(70.7% 0.126 292.4)
-
Step 500
500
#8E73E1
oklch(63.1% 0.161 292.5)
-
Step 600
600
#7959CF
oklch(55.7% 0.175 292.3)
-
Step 700
700
#6648B3
oklch(49.1% 0.162 292.3)
-
Step 800
800
#533C91
oklch(42.7% 0.134 292.2)
-
Step 900
900
#443474
oklch(37.7% 0.106 292.1)
-
Step 950
950 (this color)
#21183C
oklch(24.1% 0.067 292.2)
#21183C 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) | #091F3D | 0.039 |
| Deuteranopia (no green cones) | #0A1D3B | 0.038 |
| Tritanopia (no blue cones) | #1A1F27 | 0.053 |
| Achromatopsia (no color) | #1E1E1E | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21183C
#21183C
oklch(24.1% 0.067 292.2)
- #202200
#202200
oklch(24.2% 0.054 113)
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 #21183C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.046
- Dark #1B2431 ΔE 0.049
- Rich Black #0D1B2A ΔE 0.052
- Dark Indigo #1F0954 ΔE 0.056
- Dark Purple #35063E ΔE 0.056
- Midnight Purple #280137 ΔE 0.056
- Very Dark Purple #2A0134 ΔE 0.058
- Eggplant #380835 ΔE 0.060
Use #21183C 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.