#233D6A
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.084 260.7), rgb(35, 61, 106).
Aa
White text reads best on this color (10.78:1).
About this color
#233D6A is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.084 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 10.78:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.78:1 |
Values
| HEX | #233D6A |
| RGB | rgb(35, 61, 106) |
| HSL | hsl(218, 50%, 28%) |
| OKLCH | oklch(36.4% 0.084 260.7) |
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 #233D6A | 10.78:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #233D6A | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #233D6A text on white | 10.78:1 | AAA | Lc 94.8 | Preferred for body text |
| #233D6A text on black | 1.94:1 | Fails | Lc -7.8 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF1
oklch(88.5% 0.035 260.4)
-
Step 300
300
#AAC2EA
oklch(81% 0.063 260.6)
-
Step 400
400
#7CA1E0
oklch(70.7% 0.102 260.7)
-
Step 500
500
#5B88D7
oklch(63% 0.13 261)
-
Step 600
600
#4171C5
oklch(55.7% 0.141 260.8)
-
Step 700
700
#325EAA
oklch(49.1% 0.131 260.5)
-
Step 800
800
#2A4D8A
oklch(42.7% 0.109 260.7)
-
Step 900
900 (this color)
#233D6A
oklch(36.4% 0.084 260.7)
-
Step 950
950
#172640
oklch(27% 0.053 260.8)
#233D6A 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) | #29416C | 0.015 |
| Deuteranopia (no green cones) | #1F3A69 | 0.011 |
| Tritanopia (no blue cones) | #00474E | 0.070 |
| Achromatopsia (no color) | #3D3D3D | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D6A
#233D6A
oklch(36.4% 0.084 260.7)
- #523900
#523900
oklch(36.4% 0.075 81)
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 #233D6A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Marine Blue #01386A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.051
- Charcoal #264653 ΔE 0.056
- Marine #042E60 ΔE 0.059
- Midnight Green #073B4C ΔE 0.060
Use #233D6A 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.