#1B1638
Closest named color: Rich Black (#0D1B2A). oklch(22.7% 0.064 286.9), rgb(27, 22, 56).
Aa
White text reads best on this color (17.23:1).
About this color
#1B1638 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.064 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.042 away. White text reads best on it, at 17.23:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.23:1 |
Values
| HEX | #1B1638 |
| RGB | rgb(27, 22, 56) |
| HSL | hsl(249, 44%, 15%) |
| OKLCH | oklch(22.7% 0.064 286.9) |
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 #1B1638 | 17.23:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1B1638 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #1B1638 text on white | 17.23:1 | AAA | Lc 104.0 | Preferred for body text |
| #1B1638 text on black | 1.21:1 | 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
#D7D6F4
oklch(88.6% 0.041 287.1)
-
Step 300
300
#BDBAF0
oklch(81% 0.076 287.1)
-
Step 400
400
#9C94E8
oklch(70.7% 0.121 287.2)
-
Step 500
500
#8577E1
oklch(63% 0.155 287.1)
-
Step 600
600
#705ECE
oklch(55.6% 0.167 287.1)
-
Step 700
700
#5E4DB3
oklch(49.2% 0.155 286.9)
-
Step 800
800
#4C3F91
oklch(42.6% 0.13 286.8)
-
Step 900
900
#3F3773
oklch(37.7% 0.099 286.7)
-
Step 950
950 (this color)
#1B1638
oklch(22.7% 0.064 286.9)
#1B1638 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) | #071C39 | 0.032 |
| Deuteranopia (no green cones) | #061A37 | 0.033 |
| Tritanopia (no blue cones) | #121D24 | 0.053 |
| Achromatopsia (no color) | #1B1B1B | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1638
#1B1638
oklch(22.7% 0.064 286.9)
- #1F1D00
#1F1D00
oklch(22.6% 0.048 106)
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 #1B1638, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.042
- Dark #1B2431 ΔE 0.052
- Oxford Blue #1B263B ΔE 0.052
- Navy Blue #001146 ΔE 0.054
- Midnight Purple #280137 ΔE 0.056
- Very Dark Purple #2A0134 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.059
- Dark Purple #35063E ΔE 0.065
Use #1B1638 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.