#1B133C
Closest named color: Dark Indigo (#1F0954). oklch(22.4% 0.075 287.7), rgb(27, 19, 60).
Aa
White text reads best on this color (17.42:1).
About this color
#1B133C is a very dark, moderately saturated purple. In OKLCH its lightness is 22%, its chroma 0.075 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.049 away. White text reads best on it, at 17.42:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.20:1 |
| White text | 17.42:1 |
Values
| HEX | #1B133C |
| RGB | rgb(27, 19, 60) |
| HSL | hsl(252, 52%, 15%) |
| OKLCH | oklch(22.4% 0.075 287.7) |
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 #1B133C | 17.42:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #1B133C | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #1B133C text on white | 17.42:1 | AAA | Lc 104.1 | Preferred for body text |
| #1B133C 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D7D5F9
oklch(88.6% 0.049 287.9)
-
Step 300
300
#BDB8F8
oklch(80.9% 0.09 287.8)
-
Step 400
400
#9D91F4
oklch(70.8% 0.142 287.8)
-
Step 500
500
#8771F0
oklch(63.1% 0.183 287.9)
-
Step 600
600
#7256DE
oklch(55.6% 0.198 287.6)
-
Step 700
700
#6045C1
oklch(49.1% 0.184 287.6)
-
Step 800
800
#4E3A9C
oklch(42.8% 0.152 287.5)
-
Step 900
900
#40337C
oklch(37.7% 0.119 287.5)
-
Step 950
950 (this color)
#1B133C
oklch(22.4% 0.075 287.7)
#1B133C 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) | #001B3D | 0.042 |
| Deuteranopia (no green cones) | #00193B | 0.042 |
| Tritanopia (no blue cones) | #101C25 | 0.061 |
| Achromatopsia (no color) | #1A1A1A | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B133C
#1B133C
oklch(22.4% 0.075 287.7)
- #1E1D00
#1E1D00
oklch(22.5% 0.048 107.9)
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 #1B133C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.049
- Navy Blue #001146 ΔE 0.049
- Midnight Purple #280137 ΔE 0.050
- Rich Black #0D1B2A ΔE 0.052
- Very Dark Purple #2A0134 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.061
- Dark Purple #35063E ΔE 0.062
- Dark #1B2431 ΔE 0.063
Use #1B133C 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.