#1B1738
Closest named color: Rich Black (#0D1B2A). oklch(22.9% 0.062 286), rgb(27, 23, 56).
Aa
White text reads best on this color (17.12:1).
About this color
#1B1738 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.062 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.040 away. White text reads best on it, at 17.12:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.12:1 |
Values
| HEX | #1B1738 |
| RGB | rgb(27, 23, 56) |
| HSL | hsl(247, 42%, 15%) |
| OKLCH | oklch(22.9% 0.062 286) |
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 #1B1738 | 17.12:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1B1738 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #1B1738 text on white | 17.12:1 | AAA | Lc 103.9 | Preferred for body text |
| #1B1738 text on black | 1.22:1 | 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
#F5F5FC
oklch(97.2% 0.009 286.2)
-
Step 100
100
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D6D6F4
oklch(88.5% 0.041 285.5)
-
Step 300
300
#BCBAEF
oklch(80.9% 0.074 286.3)
-
Step 400
400
#9A95E6
oklch(70.6% 0.117 285.8)
-
Step 500
500
#8379DF
oklch(63.1% 0.15 285.7)
-
Step 600
600
#6E5FCC
oklch(55.5% 0.163 286.1)
-
Step 700
700
#5C4EB1
oklch(49.1% 0.152 285.8)
-
Step 800
800
#4B418F
oklch(42.8% 0.124 285.7)
-
Step 900
900
#3E3872
oklch(37.8% 0.096 285.5)
-
Step 950
950 (this color)
#1B1738
oklch(22.9% 0.062 286)
#1B1738 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) | #091C39 | 0.029 |
| Deuteranopia (no green cones) | #081B37 | 0.030 |
| Tritanopia (no blue cones) | #121E24 | 0.053 |
| Achromatopsia (no color) | #1C1C1C | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1738
#1B1738
oklch(22.9% 0.062 286)
- #201E00
#201E00
oklch(23% 0.049 106.1)
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 #1B1738, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.040
- Oxford Blue #1B263B ΔE 0.049
- Dark #1B2431 ΔE 0.049
- Navy Blue #001146 ΔE 0.055
- Midnight Purple #280137 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.061
- Very Dark Purple #2A0134 ΔE 0.061
- Jet #212529 ΔE 0.064
Use #1B1738 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.