#1B133D
Closest named color: Dark Indigo (#1F0954). oklch(22.5% 0.077 287.3), rgb(27, 19, 61).
Aa
White text reads best on this color (17.39:1).
About this color
#1B133D is a very dark, moderately saturated purple. In OKLCH its lightness is 23%, its chroma 0.077 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.047 away. White text reads best on it, at 17.39:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.20:1 |
| White text | 17.39:1 |
Values
| HEX | #1B133D |
| RGB | rgb(27, 19, 61) |
| HSL | hsl(251, 53%, 16%) |
| OKLCH | oklch(22.5% 0.077 287.3) |
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 #1B133D | 17.39:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #1B133D | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #1B133D text on white | 17.39:1 | AAA | Lc 104.1 | Preferred for body text |
| #1B133D 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D6D5FA
oklch(88.6% 0.051 286.6)
-
Step 300
300
#BCB8F9
oklch(80.9% 0.091 287)
-
Step 400
400
#9C90F6
oklch(70.7% 0.146 287.4)
-
Step 500
500
#8671F2
oklch(63.1% 0.186 287.3)
-
Step 600
600
#7155E1
oklch(55.6% 0.203 287)
-
Step 700
700
#6044C3
oklch(49.1% 0.188 287.5)
-
Step 800
800
#4E399E
oklch(42.8% 0.156 287.4)
-
Step 900
900
#40337D
oklch(37.8% 0.12 287.2)
-
Step 950
950 (this color)
#1B133D
oklch(22.5% 0.077 287.3)
#1B133D 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) | #001B3E | 0.042 |
| Deuteranopia (no green cones) | #00193C | 0.041 |
| Tritanopia (no blue cones) | #0F1D25 | 0.065 |
| Achromatopsia (no color) | #1A1A1A | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B133D
#1B133D
oklch(22.5% 0.077 287.3)
- #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 #1B133D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.047
- Navy Blue #001146 ΔE 0.048
- Midnight Purple #280137 ΔE 0.050
- Rich Black #0D1B2A ΔE 0.053
- Very Dark Purple #2A0134 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.061
- Dark Purple #35063E ΔE 0.062
- Dark #1B2431 ΔE 0.064
Use #1B133D 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.