#1B1533
Closest named color: Rich Black (#0D1B2A). oklch(22.1% 0.057 290.1), rgb(27, 21, 51).
Aa
White text reads best on this color (17.47:1).
About this color
#1B1533 is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.057 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 0.037 away. White text reads best on it, at 17.47:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.057) |
| Temperature | in between |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.47:1 |
Values
| HEX | #1B1533 |
| RGB | rgb(27, 21, 51) |
| HSL | hsl(252, 42%, 14%) |
| OKLCH | oklch(22.1% 0.057 290.1) |
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 #1B1533 | 17.47:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #1B1533 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #1B1533 text on white | 17.47:1 | AAA | Lc 104.2 | Preferred for body text |
| #1B1533 text on black | 1.20:1 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D8D5F1
oklch(88.4% 0.038 290.5)
-
Step 300
300
#BFBAEA
oklch(80.9% 0.067 289.6)
-
Step 400
400
#A095DF
oklch(70.8% 0.107 290.2)
-
Step 500
500
#8979D6
oklch(63.1% 0.137 289.8)
-
Step 600
600
#7460C3
oklch(55.6% 0.149 290)
-
Step 700
700
#624EA9
oklch(49% 0.14 290.4)
-
Step 800
800
#504189
oklch(42.8% 0.115 290.2)
-
Step 900
900
#42386D
oklch(37.8% 0.088 290.2)
-
Step 950
950 (this color)
#1B1533
oklch(22.1% 0.057 290.1)
#1B1533 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) | #091A34 | 0.031 |
| Deuteranopia (no green cones) | #0A1932 | 0.029 |
| Tritanopia (no blue cones) | #151B21 | 0.047 |
| Achromatopsia (no color) | #1A1A1A | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1533
#1B1533
oklch(22.1% 0.057 290.1)
- #1C1C00
#1C1C00
oklch(21.9% 0.048 109.8)
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 #1B1533, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.037
- Dark #1B2431 ΔE 0.052
- Midnight Purple #280137 ΔE 0.055
- Oxford Blue #1B263B ΔE 0.055
- Very Dark Purple #2A0134 ΔE 0.057
- Navy Blue #001146 ΔE 0.059
- Jet #212529 ΔE 0.065
- Dark Purple #35063E ΔE 0.067
Use #1B1533 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.