#1B1637
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.062 287.3), rgb(27, 22, 55).
Aa
White text reads best on this color (17.26:1).
About this color
#1B1637 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.062 and its hue 287°. 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 17.26:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.26:1 |
Values
| HEX | #1B1637 |
| RGB | rgb(27, 22, 55) |
| HSL | hsl(249, 43%, 15%) |
| OKLCH | oklch(22.6% 0.062 287.3) |
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 #1B1637 | 17.26:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #1B1637 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #1B1637 text on white | 17.26:1 | AAA | Lc 104.0 | Preferred for body text |
| #1B1637 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
#D7D6F3
oklch(88.6% 0.04 287.1)
-
Step 300
300
#BDBAEE
oklch(80.9% 0.073 287.3)
-
Step 400
400
#9C95E6
oklch(70.8% 0.117 287)
-
Step 500
500
#8578DE
oklch(63% 0.15 287.1)
-
Step 600
600
#705FCC
oklch(55.7% 0.162 287)
-
Step 700
700
#5E4DB0
oklch(49% 0.151 287.3)
-
Step 800
800
#4D408F
oklch(42.7% 0.126 287.4)
-
Step 900
900
#403772
oklch(37.7% 0.098 287.8)
-
Step 950
950 (this color)
#1B1637
oklch(22.6% 0.062 287.3)
#1B1637 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) | #081C38 | 0.032 |
| Deuteranopia (no green cones) | #071A36 | 0.032 |
| Tritanopia (no blue cones) | #131D23 | 0.053 |
| Achromatopsia (no color) | #1B1B1B | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1637
#1B1637
oklch(22.6% 0.062 287.3)
- #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 #1B1637, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.040
- Dark #1B2431 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.052
- Navy Blue #001146 ΔE 0.055
- Midnight Purple #280137 ΔE 0.056
- Very Dark Purple #2A0134 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.061
- Jet #212529 ΔE 0.065
Use #1B1637 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.