#151F3B
Closest named color: Oxford Blue (#1B263B). oklch(24.6% 0.055 267.5), rgb(21, 31, 59).
Aa
White text reads best on this color (16.26:1).
About this color
#151F3B is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.055 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.027 away. White text reads best on it, at 16.26:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.26:1 |
Values
| HEX | #151F3B |
| RGB | rgb(21, 31, 59) |
| HSL | hsl(224, 48%, 16%) |
| OKLCH | oklch(24.6% 0.055 267.5) |
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 #151F3B | 16.26:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #151F3B | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #151F3B text on white | 16.26:1 | AAA | Lc 103.1 | Preferred for body text |
| #151F3B 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#AEC0EC
oklch(80.9% 0.066 267.5)
-
Step 400
400
#849EE2
oklch(70.6% 0.104 267.7)
-
Step 500
500
#6685DA
oklch(63.2% 0.133 267.4)
-
Step 600
600
#4E6DC8
oklch(55.7% 0.145 267.4)
-
Step 700
700
#3F5AAD
oklch(49.1% 0.136 267.6)
-
Step 800
800
#344A8C
oklch(42.7% 0.112 267.6)
-
Step 900
900
#2D3E70
oklch(37.6% 0.088 267.9)
-
Step 950
950 (this color)
#151F3B
oklch(24.6% 0.055 267.5)
#151F3B 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) | #13223C | 0.010 |
| Deuteranopia (no green cones) | #0E1F3A | 0.010 |
| Tritanopia (no blue cones) | #02252A | 0.049 |
| Achromatopsia (no color) | #202020 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151F3B
#151F3B
oklch(24.6% 0.055 267.5)
- #2B1F00
#2B1F00
oklch(24.7% 0.05 87.7)
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 #151F3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.027
- Dark #1B2431 ΔE 0.031
- Rich Black #0D1B2A ΔE 0.037
- Jet #212529 ΔE 0.049
- Navy Blue #001146 ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.072
- Gunmetal #293241 ΔE 0.074
Use #151F3B 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.