#1B1639
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.065 286.6), rgb(27, 22, 57).
Aa
White text reads best on this color (17.20:1).
About this color
#1B1639 is a very dark, muted purple. In OKLCH its lightness is 23%, its chroma 0.065 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.043 away. White text reads best on it, at 17.20:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.20:1 |
Values
| HEX | #1B1639 |
| RGB | rgb(27, 22, 57) |
| HSL | hsl(249, 44%, 15%) |
| OKLCH | oklch(22.8% 0.065 286.6) |
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 #1B1639 | 17.20:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1B1639 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #1B1639 text on white | 17.20:1 | AAA | Lc 104.0 | Preferred for body text |
| #1B1639 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
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D6D6F5
oklch(88.6% 0.042 285.5)
-
Step 300
300
#BCBAF1
oklch(80.9% 0.077 286.2)
-
Step 400
400
#9B94EA
oklch(70.7% 0.124 286.5)
-
Step 500
500
#8477E3
oklch(63.1% 0.158 286.5)
-
Step 600
600
#6F5DD1
oklch(55.6% 0.172 286.5)
-
Step 700
700
#5D4CB5
oklch(49.1% 0.16 286.4)
-
Step 800
800
#4C3F93
oklch(42.8% 0.133 286.4)
-
Step 900
900
#3F3675
oklch(37.7% 0.104 286.8)
-
Step 950
950 (this color)
#1B1639
oklch(22.8% 0.065 286.6)
#1B1639 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) | #061C3A | 0.033 |
| Deuteranopia (no green cones) | #051A38 | 0.034 |
| Tritanopia (no blue cones) | #121E24 | 0.057 |
| Achromatopsia (no color) | #1B1B1B | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1639
#1B1639
oklch(22.8% 0.065 286.6)
- #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 #1B1639, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.043
- Oxford Blue #1B263B ΔE 0.052
- Dark #1B2431 ΔE 0.052
- Navy Blue #001146 ΔE 0.053
- Midnight Purple #280137 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.057
- Very Dark Purple #2A0134 ΔE 0.059
- Dark Purple #35063E ΔE 0.065
Use #1B1639 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.