#203663
Closest named color: Prussian Blue (#1D3557). oklch(34% 0.084 263), rgb(32, 54, 99).
Aa
White text reads best on this color (11.86:1).
About this color
#203663 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.084 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.022 away. White text reads best on it, at 11.86:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.86:1 |
Values
| HEX | #203663 |
| RGB | rgb(32, 54, 99) |
| HSL | hsl(220, 51%, 26%) |
| OKLCH | oklch(34% 0.084 263) |
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 #203663 | 11.86:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #203663 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #203663 text on white | 11.86:1 | AAA | Lc 97.0 | Preferred for body text |
| #203663 text on black | 1.76:1 | 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
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ABC1EA
oklch(80.8% 0.063 262.8)
-
Step 400
400
#7FA0E0
oklch(70.6% 0.101 263.1)
-
Step 500
500
#5F87D7
oklch(63% 0.129 263.1)
-
Step 600
600
#4670C4
oklch(55.7% 0.139 262.7)
-
Step 700
700
#385DAA
oklch(49.2% 0.13 263.1)
-
Step 800
800
#2E4C89
oklch(42.6% 0.108 262.9)
-
Step 900
900 (this color)
#203663
oklch(34% 0.084 263)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#203663 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) | #213B65 | 0.016 |
| Deuteranopia (no green cones) | #173462 | 0.013 |
| Tritanopia (no blue cones) | #004047 | 0.071 |
| Achromatopsia (no color) | #373737 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203663
#203663
oklch(34% 0.084 263)
- #493400
#493400
oklch(34% 0.07 83.6)
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 #203663, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.022
- Marine Blue #01386A ΔE 0.025
- Marine #042E60 ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.046
- Twilight Blue #0A437A ΔE 0.051
- Midnight Green #073B4C ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.058
- Gunmetal #293241 ΔE 0.060
Use #203663 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.