#181F49
Closest named color: Oxford Blue (#1B263B). oklch(25.9% 0.078 272.7), rgb(24, 31, 73).
Aa
White text reads best on this color (15.77:1).
About this color
#181F49 is a dark, moderately saturated blue. In OKLCH its lightness is 26%, its chroma 0.078 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.038 away. White text reads best on it, at 15.77:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.33:1 |
| White text | 15.77:1 |
Values
| HEX | #181F49 |
| RGB | rgb(24, 31, 73) |
| HSL | hsl(231, 51%, 19%) |
| OKLCH | oklch(25.9% 0.078 272.7) |
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 #181F49 | 15.77:1 | AAA | Lc -105.2 | Preferred for body text |
| Black text on #181F49 | 1.33:1 | Fails | Lc 0.0 | Not readable |
| #181F49 text on white | 15.77:1 | AAA | Lc 102.6 | Preferred for body text |
| #181F49 text on black | 1.33:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FC
oklch(88.5% 0.051 271.9)
-
Step 300
300
#ACBDFD
oklch(80.9% 0.093 272.7)
-
Step 400
400
#8298FC
oklch(70.6% 0.148 272.7)
-
Step 500
500
#667BFA
oklch(63.2% 0.189 272.8)
-
Step 600
600
#5060E9
oklch(55.7% 0.205 272.7)
-
Step 700
700
#414ECA
oklch(49.1% 0.19 272.6)
-
Step 800
800
#3541A4
oklch(42.8% 0.159 272.5)
-
Step 900
900
#2D3882
oklch(37.6% 0.124 272.6)
-
Step 950
950 (this color)
#181F49
oklch(25.9% 0.078 272.7)
#181F49 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) | #07254A | 0.024 |
| Deuteranopia (no green cones) | #002148 | 0.026 |
| Tritanopia (no blue cones) | #002930 | 0.069 |
| Achromatopsia (no color) | #232323 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181F49
#181F49
oklch(25.9% 0.078 272.7)
- #2D2300
#2D2300
oklch(26% 0.053 92.9)
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 #181F49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.038
- Dark #1B2431 ΔE 0.052
- Dark Indigo #1F0954 ΔE 0.053
- Navy Blue #001146 ΔE 0.057
- Marine #042E60 ΔE 0.058
- Space Cadet #2B2D42 ΔE 0.061
- Rich Black #0D1B2A ΔE 0.063
- Jet #212529 ΔE 0.070
Use #181F49 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.