#1C1B43
Closest named color: Oxford Blue (#1B263B). oklch(24.9% 0.073 280.8), rgb(28, 27, 67).
Aa
White text reads best on this color (16.31:1).
About this color
#1C1B43 is a very dark, moderately saturated purple. In OKLCH its lightness is 25%, its chroma 0.073 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.041 away. White text reads best on it, at 16.31:1.
| Hue family | Purples |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.31:1 |
Values
| HEX | #1C1B43 |
| RGB | rgb(28, 27, 67) |
| HSL | hsl(242, 43%, 18%) |
| OKLCH | oklch(24.9% 0.073 280.8) |
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 #1C1B43 | 16.31:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #1C1B43 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #1C1B43 text on white | 16.31:1 | AAA | Lc 103.1 | Preferred for body text |
| #1C1B43 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D3D6F9
oklch(88.5% 0.048 281.5)
-
Step 300
300
#B6BBF8
oklch(81% 0.086 280.6)
-
Step 400
400
#9295F5
oklch(70.8% 0.139 280.9)
-
Step 500
500
#7977F1
oklch(63.1% 0.178 280.7)
-
Step 600
600
#645CDF
oklch(55.5% 0.193 280.8)
-
Step 700
700
#534BC2
oklch(49.1% 0.18 280.5)
-
Step 800
800
#443E9D
oklch(42.7% 0.149 280.8)
-
Step 900
900
#39367D
oklch(37.7% 0.117 281.1)
-
Step 950
950 (this color)
#1C1B43
oklch(24.9% 0.073 280.8)
#1C1B43 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) | #062144 | 0.031 |
| Deuteranopia (no green cones) | #031E42 | 0.033 |
| Tritanopia (no blue cones) | #0C242C | 0.063 |
| Achromatopsia (no color) | #202020 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C1B43
#1C1B43
oklch(24.9% 0.073 280.8)
- #272200
#272200
oklch(25% 0.052 101.3)
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 #1C1B43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.041
- Dark #1B2431 ΔE 0.050
- Dark Indigo #1F0954 ΔE 0.050
- Navy Blue #001146 ΔE 0.055
- Rich Black #0D1B2A ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.067
- Jet #212529 ΔE 0.067
- Dark Purple #35063E ΔE 0.067
Use #1C1B43 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.