#151F57
Closest named color: Marine (#042E60). oklch(27% 0.102 270.4), rgb(21, 31, 87).
Aa
White text reads best on this color (15.37:1).
About this color
#151F57 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.102 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.044 away. White text reads best on it, at 15.37:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.36:1 |
| White text | 15.37:1 |
Values
| HEX | #151F57 |
| RGB | rgb(21, 31, 87) |
| HSL | hsl(231, 61%, 21%) |
| OKLCH | oklch(27% 0.102 270.4) |
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 #151F57 | 15.37:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #151F57 | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #151F57 text on white | 15.37:1 | AAA | Lc 102.0 | Preferred for body text |
| #151F57 text on black | 1.36:1 | 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
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#4458FF
oklch(55.5% 0.245 270.5)
-
Step 700
700
#353FEA
oklch(49.1% 0.249 270.4)
-
Step 800
800
#2B37BD
oklch(42.8% 0.206 270.3)
-
Step 900
900
#253295
oklch(37.7% 0.161 270.5)
-
Step 950
950 (this color)
#151F57
oklch(27% 0.102 270.4)
#151F57 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) | #002859 | 0.029 |
| Deuteranopia (no green cones) | #002256 | 0.021 |
| Tritanopia (no blue cones) | #002D37 | 0.082 |
| Achromatopsia (no color) | #252525 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151F57
#151F57
oklch(27% 0.102 270.4)
- #312500
#312500
oklch(27.1% 0.055 90.3)
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 #151F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.044
- Midnight Blue #191970 ΔE 0.046
- Dark Indigo #1F0954 ΔE 0.048
- Oxford Blue #1B263B ΔE 0.060
- Darkblue #030764 ΔE 0.060
- Navy Blue #001146 ΔE 0.061
- Dark Royal Blue #02066F ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.069
Use #151F57 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.