#181E52
Closest named color: Dark Indigo (#1F0954). oklch(26.5% 0.094 273.2), rgb(24, 30, 82).
Aa
White text reads best on this color (15.59:1).
About this color
#181E52 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.094 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.045 away. White text reads best on it, at 15.59:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.34:1 |
| White text | 15.59:1 |
Values
| HEX | #181E52 |
| RGB | rgb(24, 30, 82) |
| HSL | hsl(234, 55%, 21%) |
| OKLCH | oklch(26.5% 0.094 273.2) |
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 #181E52 | 15.59:1 | AAA | Lc -105.0 | Preferred for body text |
| Black text on #181E52 | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #181E52 text on white | 15.59:1 | AAA | Lc 102.3 | Preferred for body text |
| #181E52 text on black | 1.34:1 | 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
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8297FF
oklch(70.6% 0.154 273.2)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#4E55FF
oklch(55.6% 0.246 273.3)
-
Step 700
700
#4043E0
oklch(49.2% 0.231 273.2)
-
Step 800
800
#3439B5
oklch(42.8% 0.191 273.2)
-
Step 900
900
#2C338E
oklch(37.6% 0.148 273.5)
-
Step 950
950 (this color)
#181E52
oklch(26.5% 0.094 273.2)
#181E52 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) | #002654 | 0.030 |
| Deuteranopia (no green cones) | #002151 | 0.026 |
| Tritanopia (no blue cones) | #002B34 | 0.079 |
| Achromatopsia (no color) | #242424 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #181E52
#181E52
oklch(26.5% 0.094 273.2)
- #2E2400
#2E2400
oklch(26.4% 0.054 93.2)
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 #181E52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.045
- Marine #042E60 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.053
- Midnight Blue #191970 ΔE 0.054
- Navy Blue #001146 ΔE 0.058
- Darkblue #030764 ΔE 0.065
- Dark #1B2431 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.069
Use #181E52 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.