#151D3D
Closest named color: Oxford Blue (#1B263B). oklch(24.3% 0.062 270.6), rgb(21, 29, 61).
Aa
White text reads best on this color (16.47:1).
About this color
#151D3D is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.062 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.034 away. White text reads best on it, at 16.47:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.47:1 |
Values
| HEX | #151D3D |
| RGB | rgb(21, 29, 61) |
| HSL | hsl(228, 49%, 16%) |
| OKLCH | oklch(24.3% 0.062 270.6) |
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 #151D3D | 16.47:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #151D3D | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #151D3D text on white | 16.47:1 | AAA | Lc 103.3 | Preferred for body text |
| #151D3D text on black | 1.27:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AEBFF1
oklch(80.9% 0.073 270.1)
-
Step 400
400
#859CEA
oklch(70.7% 0.117 270.7)
-
Step 500
500
#6881E3
oklch(63% 0.15 270.8)
-
Step 600
600
#5169D1
oklch(55.7% 0.162 270.6)
-
Step 700
700
#4256B5
oklch(49% 0.152 270.9)
-
Step 800
800
#364793
oklch(42.7% 0.126 270.7)
-
Step 900
900
#2E3C75
oklch(37.6% 0.099 270.6)
-
Step 950
950 (this color)
#151D3D
oklch(24.3% 0.062 270.6)
#151D3D 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) | #0E213E | 0.015 |
| Deuteranopia (no green cones) | #091D3C | 0.016 |
| Tritanopia (no blue cones) | #00242A | 0.055 |
| Achromatopsia (no color) | #1F1F1F | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D3D
#151D3D
oklch(24.3% 0.062 270.6)
- #291E00
#291E00
oklch(24.2% 0.049 89.1)
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 #151D3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.034
- Dark #1B2431 ΔE 0.039
- Rich Black #0D1B2A ΔE 0.040
- Navy Blue #001146 ΔE 0.053
- Jet #212529 ΔE 0.057
- Dark Indigo #1F0954 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.067
- Marine #042E60 ΔE 0.077
Use #151D3D 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.