#233A66
Closest named color: Marine Blue (#01386A). oklch(35.4% 0.082 262.2), rgb(35, 58, 102).
Aa
White text reads best on this color (11.23:1).
About this color
#233A66 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.082 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.029 away. White text reads best on it, at 11.23:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.23:1 |
Values
| HEX | #233A66 |
| RGB | rgb(35, 58, 102) |
| HSL | hsl(219, 49%, 27%) |
| OKLCH | oklch(35.4% 0.082 262.2) |
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 #233A66 | 11.23:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #233A66 | 1.86:1 | Fails | Lc 8.1 | Not readable |
| #233A66 text on white | 11.23:1 | AAA | Lc 95.8 | Preferred for body text |
| #233A66 text on black | 1.86:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ABC1E9
oklch(80.8% 0.062 262.3)
-
Step 400
400
#7FA1DE
oklch(70.8% 0.098 261.7)
-
Step 500
500
#5F88D5
oklch(63.1% 0.125 262.1)
-
Step 600
600
#4570C3
oklch(55.6% 0.138 262.2)
-
Step 700
700
#375EA8
oklch(49.2% 0.127 261.9)
-
Step 800
800
#2E4D88
oklch(42.8% 0.105 262)
-
Step 900
900 (this color)
#233A66
oklch(35.4% 0.082 262.2)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#233A66 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) | #273E68 | 0.014 |
| Deuteranopia (no green cones) | #1D3865 | 0.010 |
| Tritanopia (no blue cones) | #00444B | 0.069 |
| Achromatopsia (no color) | #3B3B3B | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233A66
#233A66
oklch(35.4% 0.082 262.2)
- #4E3700
#4E3700
oklch(35.4% 0.073 82.4)
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 #233A66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.030
- Twilight Blue #0A437A ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.048
- Marine #042E60 ΔE 0.051
- Midnight Green #073B4C ΔE 0.055
- Charcoal #264653 ΔE 0.058
Use #233A66 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.