#151C48
Closest named color: Oxford Blue (#1B263B). oklch(24.9% 0.082 272.2), rgb(21, 28, 72).
Aa
White text reads best on this color (16.25:1).
About this color
#151C48 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.082 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.045 away. White text reads best on it, at 16.25:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.25:1 |
Values
| HEX | #151C48 |
| RGB | rgb(21, 28, 72) |
| HSL | hsl(232, 55%, 18%) |
| OKLCH | oklch(24.9% 0.082 272.2) |
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 #151C48 | 16.25:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #151C48 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #151C48 text on white | 16.25:1 | AAA | Lc 103.0 | Preferred for body text |
| #151C48 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFF
oklch(63.2% 0.198 272.1)
-
Step 600
600
#4D5EEF
oklch(55.6% 0.216 272.1)
-
Step 700
700
#3F4CD0
oklch(49.1% 0.201 272.2)
-
Step 800
800
#343FA8
oklch(42.7% 0.167 272.5)
-
Step 900
900
#2C3785
oklch(37.6% 0.13 272.4)
-
Step 950
950 (this color)
#151C48
oklch(24.9% 0.082 272.2)
#151C48 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) | #00234A | 0.027 |
| Deuteranopia (no green cones) | #001E47 | 0.024 |
| Tritanopia (no blue cones) | #00262E | 0.069 |
| Achromatopsia (no color) | #202020 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151C48
#151C48
oklch(24.9% 0.082 272.2)
- #2A2000
#2A2000
oklch(24.8% 0.051 91.8)
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 #151C48, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.045
- Navy Blue #001146 ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.048
- Dark #1B2431 ΔE 0.056
- Rich Black #0D1B2A ΔE 0.060
- Marine #042E60 ΔE 0.065
- Night Blue #040348 ΔE 0.070
- Darkblue #030764 ΔE 0.071
Use #151C48 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.