#203B6F
Closest named color: Marine Blue (#01386A). oklch(36.1% 0.096 262.1), rgb(32, 59, 111).
Aa
White text reads best on this color (10.95:1).
About this color
#203B6F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.096 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.028 away. White text reads best on it, at 10.95:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.91:1 |
| White text | 10.95:1 |
Values
| HEX | #203B6F |
| RGB | rgb(32, 59, 111) |
| HSL | hsl(219, 55%, 28%) |
| OKLCH | oklch(36.1% 0.096 262.1) |
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 #203B6F | 10.95:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #203B6F | 1.91:1 | Fails | Lc 8.8 | Not readable |
| #203B6F text on white | 10.95:1 | AAA | Lc 95.1 | Preferred for body text |
| #203B6F text on black | 1.91:1 | Fails | Lc -7.5 | 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
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A8C1F0
oklch(80.9% 0.072 262.9)
-
Step 400
400
#79A0E8
oklch(70.7% 0.115 262.1)
-
Step 500
500
#5787E2
oklch(63.2% 0.147 262.1)
-
Step 600
600
#3C6ECF
oklch(55.5% 0.16 262.1)
-
Step 700
700
#2F5CB4
oklch(49.2% 0.149 262.1)
-
Step 800
800
#274B91
oklch(42.6% 0.123 262.1)
-
Step 900
900 (this color)
#203B6F
oklch(36.1% 0.096 262.1)
-
Step 950
950
#162644
oklch(27.2% 0.06 262)
#203B6F 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) | #224071 | 0.016 |
| Deuteranopia (no green cones) | #13396E | 0.015 |
| Tritanopia (no blue cones) | #00474F | 0.078 |
| Achromatopsia (no color) | #3C3C3C | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203B6F
#203B6F
oklch(36.1% 0.096 262.1)
- #513900
#513900
oklch(36.2% 0.075 82.1)
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 #203B6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.028
- Twilight Blue #0A437A ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.044
- Marine #042E60 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.061
- Cobalt #1E488F ΔE 0.062
- Light Navy #155084 ΔE 0.066
Use #203B6F 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.