#233563
Closest named color: Prussian Blue (#1D3557). oklch(33.9% 0.084 266), rgb(35, 53, 99).
Aa
White text reads best on this color (11.92:1).
About this color
#233563 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.084 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.023 away. White text reads best on it, at 11.92:1.
| 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 | 11.92:1 |
Values
| HEX | #233563 |
| RGB | rgb(35, 53, 99) |
| HSL | hsl(223, 48%, 26%) |
| OKLCH | oklch(33.9% 0.084 266) |
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 #233563 | 11.92:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #233563 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #233563 text on white | 11.92:1 | AAA | Lc 97.1 | Preferred for body text |
| #233563 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#839FE0
oklch(70.7% 0.101 266)
-
Step 500
500
#6486D7
oklch(63.1% 0.128 265.7)
-
Step 600
600
#4C6EC5
oklch(55.6% 0.141 265.9)
-
Step 700
700
#3D5BAA
oklch(49% 0.131 266.1)
-
Step 800
800
#334B8A
oklch(42.7% 0.108 266.2)
-
Step 900
900 (this color)
#233563
oklch(33.9% 0.084 266)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#233563 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) | #203A65 | 0.015 |
| Deuteranopia (no green cones) | #173462 | 0.015 |
| Tritanopia (no blue cones) | #003F47 | 0.072 |
| Achromatopsia (no color) | #373737 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233563
#233563
oklch(33.9% 0.084 266)
- #483500
#483500
oklch(34.1% 0.07 86.3)
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 #233563, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.023
- Marine Blue #01386A ΔE 0.028
- Marine #042E60 ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.048
- Twilight Blue #0A437A ΔE 0.053
- Midnight Green #073B4C ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.059
- Gunmetal #293241 ΔE 0.060
Use #233563 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.