#233D66
Closest named color: Marine Blue (#01386A). oklch(36.1% 0.078 259.2), rgb(35, 61, 102).
Aa
White text reads best on this color (10.87:1).
About this color
#233D66 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.078 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.033 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #233D66 |
| RGB | rgb(35, 61, 102) |
| HSL | hsl(217, 49%, 27%) |
| OKLCH | oklch(36.1% 0.078 259.2) |
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 #233D66 | 10.87:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #233D66 | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #233D66 text on white | 10.87:1 | AAA | Lc 95.0 | Preferred for body text |
| #233D66 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#AAC2E7
oklch(80.9% 0.059 259)
-
Step 400
400
#7DA2DB
oklch(70.7% 0.093 258.8)
-
Step 500
500
#5C8AD1
oklch(63.2% 0.119 258.8)
-
Step 600
600
#4272BF
oklch(55.6% 0.131 259.4)
-
Step 700
700
#335FA4
oklch(49% 0.121 259.1)
-
Step 800
800
#2B4E85
oklch(42.6% 0.1 259.1)
-
Step 900
900 (this color)
#233D66
oklch(36.1% 0.078 259.2)
-
Step 950
950
#17263E
oklch(26.8% 0.05 259.5)
#233D66 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) | #2B4068 | 0.015 |
| Deuteranopia (no green cones) | #223A65 | 0.009 |
| Tritanopia (no blue cones) | #00464C | 0.066 |
| Achromatopsia (no color) | #3D3D3D | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D66
#233D66
oklch(36.1% 0.078 259.2)
- #523800
#523800
oklch(36.1% 0.075 79.6)
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 #233D66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.044
- Charcoal #264653 ΔE 0.050
- Midnight Green #073B4C ΔE 0.054
- Marine #042E60 ΔE 0.058
Use #233D66 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.