#151B4C
Closest named color: Dark Indigo (#1F0954). oklch(25.1% 0.09 272.8), rgb(21, 27, 76).
Aa
White text reads best on this color (16.24:1).
About this color
#151B4C is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.090 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.042 away. White text reads best on it, at 16.24:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.29:1 |
| White text | 16.24:1 |
Values
| HEX | #151B4C |
| RGB | rgb(21, 27, 76) |
| HSL | hsl(233, 57%, 19%) |
| OKLCH | oklch(25.1% 0.09 272.8) |
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 #151B4C | 16.24:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #151B4C | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #151B4C text on white | 16.24:1 | AAA | Lc 102.9 | Preferred for body text |
| #151B4C text on black | 1.29:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8298FF
oklch(70.8% 0.152 272.8)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600
#4D58FA
oklch(55.6% 0.237 272.8)
-
Step 700
700
#3F46DA
oklch(49% 0.22 272.8)
-
Step 800
800
#333BB0
oklch(42.6% 0.183 272.7)
-
Step 900
900
#2C358B
oklch(37.7% 0.142 273)
-
Step 950
950 (this color)
#151B4C
oklch(25.1% 0.09 272.8)
#151B4C 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) | #00234E | 0.029 |
| Deuteranopia (no green cones) | #001E4B | 0.024 |
| Tritanopia (no blue cones) | #002730 | 0.075 |
| Achromatopsia (no color) | #202020 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B4C
#151B4C
oklch(25.1% 0.09 272.8)
- #2A2100
#2A2100
oklch(25.1% 0.051 93.9)
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 #151B4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.042
- Navy Blue #001146 ΔE 0.046
- Oxford Blue #1B263B ΔE 0.052
- Marine #042E60 ΔE 0.063
- Darkblue #030764 ΔE 0.064
- Dark #1B2431 ΔE 0.064
- Midnight Blue #191970 ΔE 0.065
- Rich Black #0D1B2A ΔE 0.067
Use #151B4C 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.