#233181
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.135 270.3), rgb(35, 49, 129).
Aa
White text reads best on this color (11.48:1).
About this color
#233181 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.135 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.052 away. White text reads best on it, at 11.48:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.82:1 |
| White text | 11.48:1 |
Values
| HEX | #233181 |
| RGB | rgb(35, 49, 129) |
| HSL | hsl(231, 57%, 32%) |
| OKLCH | oklch(35.5% 0.135 270.3) |
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 #233181 | 11.48:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #233181 | 1.82:1 | Fails | Lc 7.9 | Not readable |
| #233181 text on white | 11.48:1 | AAA | Lc 96.0 | Preferred for body text |
| #233181 text on black | 1.82:1 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FE
oklch(93.5% 0.029 271.1)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#465DF4
oklch(55.5% 0.226 270.4)
-
Step 700
700
#394BD5
oklch(49.1% 0.21 270.5)
-
Step 800
800
#2E3FAC
oklch(42.7% 0.174 270.3)
-
Step 900
900 (this color)
#233181
oklch(35.5% 0.135 270.3)
-
Step 950
950
#172150
oklch(26.9% 0.087 270.5)
#233181 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) | #003E84 | 0.038 |
| Deuteranopia (no green cones) | #00357F | 0.027 |
| Tritanopia (no blue cones) | #004554 | 0.108 |
| Achromatopsia (no color) | #393939 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233181
#233181
oklch(35.5% 0.135 270.3)
- #4A3A00
#4A3A00
oklch(35.6% 0.073 91.4)
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 #233181, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.052
- Twilight Blue #0A437A ΔE 0.052
- Cobalt #1E488F ΔE 0.064
- Marine #042E60 ΔE 0.066
- Royal #0C1793 ΔE 0.067
- Midnight Blue #191970 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.070
- Sapphire #2138AB ΔE 0.072
Use #233181 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.