#151F40
Closest named color: Oxford Blue (#1B263B). oklch(25% 0.064 268.8), rgb(21, 31, 64).
Aa
White text reads best on this color (16.13:1).
About this color
#151F40 is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.064 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.029 away. White text reads best on it, at 16.13:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.13:1 |
Values
| HEX | #151F40 |
| RGB | rgb(21, 31, 64) |
| HSL | hsl(226, 51%, 17%) |
| OKLCH | oklch(25% 0.064 268.8) |
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 #151F40 | 16.13:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #151F40 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #151F40 text on white | 16.13:1 | AAA | Lc 103.0 | Preferred for body text |
| #151F40 text on black | 1.30:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#819DEC
oklch(70.7% 0.12 268.4)
-
Step 500
500
#6382E6
oklch(63.1% 0.154 268.7)
-
Step 600
600
#4B69D5
oklch(55.6% 0.169 268.7)
-
Step 700
700
#3D57B8
oklch(49.1% 0.156 268.7)
-
Step 800
800
#324895
oklch(42.8% 0.129 268.5)
-
Step 900
900
#2C3D77
oklch(37.8% 0.101 268.9)
-
Step 950
950 (this color)
#151F40
oklch(25% 0.064 268.8)
#151F40 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) | #102341 | 0.013 |
| Deuteranopia (no green cones) | #091F3F | 0.015 |
| Tritanopia (no blue cones) | #00262C | 0.055 |
| Achromatopsia (no color) | #212121 | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151F40
#151F40
oklch(25% 0.064 268.8)
- #2C2000
#2C2000
oklch(25.1% 0.051 88.2)
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 #151F40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.029
- Dark #1B2431 ΔE 0.038
- Rich Black #0D1B2A ΔE 0.045
- Navy Blue #001146 ΔE 0.056
- Jet #212529 ΔE 0.057
- Space Cadet #2B2D42 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.065
- Marine #042E60 ΔE 0.069
Use #151F40 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.