#1D1637
Closest named color: Rich Black (#0D1B2A). oklch(22.9% 0.062 290.4), rgb(29, 22, 55).
Aa
White text reads best on this color (17.18:1).
About this color
#1D1637 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.062 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.042 away. White text reads best on it, at 17.18:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.062) |
| Temperature | in between |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.18:1 |
Values
| HEX | #1D1637 |
| RGB | rgb(29, 22, 55) |
| HSL | hsl(253, 43%, 15%) |
| OKLCH | oklch(22.9% 0.062 290.4) |
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 #1D1637 | 17.18:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1D1637 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #1D1637 text on white | 17.18:1 | AAA | Lc 104.0 | Preferred for body text |
| #1D1637 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F3
oklch(88.5% 0.041 290.1)
-
Step 300
300
#C0B9ED
oklch(80.9% 0.073 290.8)
-
Step 400
400
#A093E4
oklch(70.6% 0.117 290.4)
-
Step 500
500
#8A76DC
oklch(63% 0.15 290.5)
-
Step 600
600
#755DCA
oklch(55.6% 0.162 290.2)
-
Step 700
700
#634CAF
oklch(49.2% 0.151 290.4)
-
Step 800
800
#503F8D
oklch(42.7% 0.124 290.2)
-
Step 900
900
#423671
oklch(37.7% 0.098 290.3)
-
Step 950
950 (this color)
#1D1637
oklch(22.9% 0.062 290.4)
#1D1637 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 | 0.035 |
| Deuteranopia (no green cones) | #091B36 | 0.034 |
| Tritanopia (no blue cones) | #161D23 | 0.052 |
| Achromatopsia (no color) | #1B1B1B | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D1637
#1D1637
oklch(22.9% 0.062 290.4)
- #1E1E00
#1E1E00
oklch(22.8% 0.05 109.8)
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 #1D1637, 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 0.051
- Oxford Blue #1B263B ΔE 0.051
- Midnight Purple #280137 ΔE 0.054
- Very Dark Purple #2A0134 ΔE 0.056
- Navy Blue #001146 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.061
- Dark Purple #35063E ΔE 0.062
Use #1D1637 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.