#203666
Closest named color: Marine Blue (#01386A). oklch(34.2% 0.089 263.8), rgb(32, 54, 102).
Aa
White text reads best on this color (11.79:1).
About this color
#203666 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.089 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.023 away. White text reads best on it, at 11.79:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.78:1 |
| White text | 11.79:1 |
Values
| HEX | #203666 |
| RGB | rgb(32, 54, 102) |
| HSL | hsl(221, 52%, 26%) |
| OKLCH | oklch(34.2% 0.089 263.8) |
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 #203666 | 11.79:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #203666 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #203666 text on white | 11.79:1 | AAA | Lc 96.8 | Preferred for body text |
| #203666 text on black | 1.78:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#ABC1ED
oklch(80.9% 0.067 264.1)
-
Step 400
400
#7EA0E3
oklch(70.7% 0.106 263.3)
-
Step 500
500
#5E86DB
oklch(63% 0.136 263.9)
-
Step 600
600
#456EC9
oklch(55.5% 0.148 264)
-
Step 700
700
#375CAE
oklch(49.2% 0.138 263.8)
-
Step 800
800
#2E4B8D
oklch(42.6% 0.115 264.3)
-
Step 900
900 (this color)
#203666
oklch(34.2% 0.089 263.8)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#203666 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) | #1F3B68 | 0.015 |
| Deuteranopia (no green cones) | #143565 | 0.013 |
| Tritanopia (no blue cones) | #004149 | 0.073 |
| Achromatopsia (no color) | #383838 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203666
#203666
oklch(34.2% 0.089 263.8)
- #4A3500
#4A3500
oklch(34.4% 0.071 84)
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 #203666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.023
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.051
- Midnight Green #073B4C ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.061
- Gunmetal #293241 ΔE 0.065
Use #203666 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.