#1C1737
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.06 287.9), rgb(28, 23, 55).
Aa
White text reads best on this color (17.11:1).
About this color
#1C1737 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.060 and its hue 288°. 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 17.11:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.11:1 |
Values
| HEX | #1C1737 |
| RGB | rgb(28, 23, 55) |
| HSL | hsl(249, 41%, 15%) |
| OKLCH | oklch(23% 0.06 287.9) |
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 #1C1737 | 17.11:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1C1737 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #1C1737 text on white | 17.11:1 | AAA | Lc 103.9 | Preferred for body text |
| #1C1737 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
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D7D6F3
oklch(88.6% 0.04 287.1)
-
Step 300
300
#BEBAED
oklch(80.9% 0.072 288.3)
-
Step 400
400
#9D95E4
oklch(70.8% 0.114 287.7)
-
Step 500
500
#8678DB
oklch(63% 0.145 288)
-
Step 600
600
#715FC9
oklch(55.6% 0.158 287.9)
-
Step 700
700
#5F4EAE
oklch(49.1% 0.147 287.9)
-
Step 800
800
#4D408D
oklch(42.6% 0.123 287.8)
-
Step 900
900
#403770
oklch(37.6% 0.095 288.2)
-
Step 950
950 (this color)
#1C1737
oklch(23% 0.06 287.9)
#1C1737 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) | #0A1C38 | 0.030 |
| Deuteranopia (no green cones) | #0A1B36 | 0.030 |
| Tritanopia (no blue cones) | #141E24 | 0.051 |
| Achromatopsia (no color) | #1C1C1C | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C1737
#1C1737
oklch(23% 0.06 287.9)
- #1F1E00
#1F1E00
oklch(22.9% 0.049 108)
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 #1C1737, 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 0.048
- Oxford Blue #1B263B ΔE 0.048
- Navy Blue #001146 ΔE 0.058
- Midnight Purple #280137 ΔE 0.058
- Very Dark Purple #2A0134 ΔE 0.060
- Jet #212529 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.062
Use #1C1737 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.