#1B1933
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.049 285.3), rgb(27, 25, 51).
Aa
White text reads best on this color (17.02:1).
About this color
#1B1933 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.049 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 17.02:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.02:1 |
Values
| HEX | #1B1933 |
| RGB | rgb(27, 25, 51) |
| HSL | hsl(245, 34%, 15%) |
| OKLCH | oklch(23% 0.049 285.3) |
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 #1B1933 | 17.02:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #1B1933 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #1B1933 text on white | 17.02:1 | AAA | Lc 103.9 | Preferred for body text |
| #1B1933 text on black | 1.23:1 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F5
oklch(93.5% 0.017 286.1)
-
Step 200
200
#D6D7EE
oklch(88.5% 0.031 283.8)
-
Step 300
300
#BCBCE6
oklch(80.9% 0.059 285)
-
Step 400
400
#9B98D9
oklch(70.7% 0.094 285.8)
-
Step 500
500
#837ECE
oklch(63.1% 0.119 285.3)
-
Step 600
600
#6D66BB
oklch(55.6% 0.129 285.1)
-
Step 700
700
#5B54A1
oklch(49% 0.12 285.2)
-
Step 800
800
#4B4583
oklch(42.7% 0.1 285.7)
-
Step 900
900
#3E3B69
oklch(37.8% 0.077 285)
-
Step 950
950 (this color)
#1B1933
oklch(23% 0.049 285.3)
#1B1933 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) | #101D34 | 0.021 |
| Deuteranopia (no green cones) | #0F1B32 | 0.020 |
| Tritanopia (no blue cones) | #141E23 | 0.042 |
| Achromatopsia (no color) | #1C1C1C | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1933
#1B1933
oklch(23% 0.049 285.3)
- #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 #1B1933, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Dark #1B2431 ΔE 0.039
- Oxford Blue #1B263B ΔE 0.043
- Jet #212529 ΔE 0.053
- Navy Blue #001146 ΔE 0.063
- Midnight Purple #280137 ΔE 0.066
- Very Dark Purple #2A0134 ΔE 0.067
- Eggplant #380835 ΔE 0.072
Use #1B1933 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.