#1B1A43
Closest named color: Oxford Blue (#1B263B). oklch(24.5% 0.075 280.4), rgb(27, 26, 67).
Aa
White text reads best on this color (16.46:1).
About this color
#1B1A43 is a very dark, moderately saturated purple. In OKLCH its lightness is 25%, its chroma 0.075 and its hue 280°. 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 16.46:1.
| Hue family | Purples |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.46:1 |
Values
| HEX | #1B1A43 |
| RGB | rgb(27, 26, 67) |
| HSL | hsl(241, 44%, 18%) |
| OKLCH | oklch(24.5% 0.075 280.4) |
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 #1B1A43 | 16.46:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #1B1A43 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #1B1A43 text on white | 16.46:1 | AAA | Lc 103.3 | Preferred for body text |
| #1B1A43 text on black | 1.27:1 | 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
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B5BBFA
oklch(81% 0.089 280)
-
Step 400
400
#9195F7
oklch(70.8% 0.142 280.3)
-
Step 500
500
#7876F3
oklch(63% 0.182 280.5)
-
Step 600
600
#635BE2
oklch(55.5% 0.198 280.4)
-
Step 700
700
#534AC4
oklch(49.1% 0.183 280.5)
-
Step 800
800
#433E9F
oklch(42.8% 0.152 280.1)
-
Step 900
900
#38367E
oklch(37.7% 0.118 280.3)
-
Step 950
950 (this color)
#1B1A43
oklch(24.5% 0.075 280.4)
#1B1A43 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) | #032144 | 0.034 |
| Deuteranopia (no green cones) | #001E42 | 0.035 |
| Tritanopia (no blue cones) | #0A232B | 0.064 |
| Achromatopsia (no color) | #1F1F1F | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1A43
#1B1A43
oklch(24.5% 0.075 280.4)
- #262100
#262100
oklch(24.6% 0.051 101.1)
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 #1B1A43, 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 0.048
- Navy Blue #001146 ΔE 0.052
- Dark #1B2431 ΔE 0.052
- Rich Black #0D1B2A ΔE 0.055
- Midnight Purple #280137 ΔE 0.067
- Dark Purple #35063E ΔE 0.068
- Jet #212529 ΔE 0.069
Use #1B1A43 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.