#233D63
Closest named color: Prussian Blue (#1D3557). oklch(35.9% 0.074 257.8), rgb(35, 61, 99).
Aa
White text reads best on this color (10.94:1).
About this color
#233D63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.074 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.032 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #233D63 |
| RGB | rgb(35, 61, 99) |
| HSL | hsl(216, 48%, 26%) |
| OKLCH | oklch(35.9% 0.074 257.8) |
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 #233D63 | 10.94:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #233D63 | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #233D63 text on white | 10.94:1 | AAA | Lc 95.2 | Preferred for body text |
| #233D63 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E5
oklch(80.9% 0.056 258.7)
-
Step 400
400
#7EA2D8
oklch(70.6% 0.089 258.3)
-
Step 500
500
#5D8ACD
oklch(63% 0.113 258.1)
-
Step 600
600
#4373BA
oklch(55.6% 0.123 258.1)
-
Step 700
700
#3460A0
oklch(49% 0.114 257.8)
-
Step 800
800
#2C4F82
oklch(42.7% 0.094 257.8)
-
Step 900
900 (this color)
#233D63
oklch(35.9% 0.074 257.8)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#233D63 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) | #2D4065 | 0.017 |
| Deuteranopia (no green cones) | #243A62 | 0.009 |
| Tritanopia (no blue cones) | #00464B | 0.063 |
| Achromatopsia (no color) | #3D3D3D | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D63
#233D63
oklch(35.9% 0.074 257.8)
- #523702
#523702
oklch(35.9% 0.074 77.5)
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 #233D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.032
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.039
- Twilight Blue #0A437A ΔE 0.042
- Charcoal #264653 ΔE 0.046
- Midnight Green #073B4C ΔE 0.049
- Marine #042E60 ΔE 0.058
Use #233D63 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.