#1B1748
Closest named color: Dark Indigo (#1F0954). oklch(24.4% 0.088 281.3), rgb(27, 23, 72).
Aa
White text reads best on this color (16.63:1).
About this color
#1B1748 is a very dark, moderately saturated purple. In OKLCH its lightness is 24%, its chroma 0.088 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.035 away. White text reads best on it, at 16.63:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.26:1 |
| White text | 16.63:1 |
Values
| HEX | #1B1748 |
| RGB | rgb(27, 23, 72) |
| HSL | hsl(245, 52%, 19%) |
| OKLCH | oklch(24.4% 0.088 281.3) |
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 #1B1748 | 16.63:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #1B1748 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #1B1748 text on white | 16.63:1 | AAA | Lc 103.3 | Preferred for body text |
| #1B1748 text on black | 1.26:1 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E6E8FE
oklch(93.6% 0.03 281.7)
-
Step 200
200
#D2D5FF
oklch(88.4% 0.058 281.9)
-
Step 300
300
#B5B9FF
oklch(80.8% 0.099 281.4)
-
Step 400
400
#9192FF
oklch(70.7% 0.157 281.2)
-
Step 500
500
#7971FF
oklch(63% 0.204 281.3)
-
Step 600
600
#6551F4
oklch(55.6% 0.232 281.3)
-
Step 700
700
#5540D5
oklch(49.2% 0.216 281.3)
-
Step 800
800
#4536AC
oklch(42.7% 0.179 281.4)
-
Step 900
900
#393188
oklch(37.7% 0.14 281.5)
-
Step 950
950 (this color)
#1B1748
oklch(24.4% 0.088 281.3)
#1B1748 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) | #00204A | 0.038 |
| Deuteranopia (no green cones) | #001C47 | 0.036 |
| Tritanopia (no blue cones) | #05232C | 0.076 |
| Achromatopsia (no color) | #1E1E1E | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1748
#1B1748
oklch(24.4% 0.088 281.3)
- #252100
#252100
oklch(24.5% 0.051 102.9)
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 #1B1748, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.035
- Navy Blue #001146 ΔE 0.047
- Oxford Blue #1B263B ΔE 0.056
- Midnight Purple #280137 ΔE 0.065
- Dark #1B2431 ΔE 0.065
- Rich Black #0D1B2A ΔE 0.065
- Night Blue #040348 ΔE 0.066
- Dark Purple #35063E ΔE 0.067
Use #1B1748 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.