#233D81
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.119 265.4), rgb(35, 61, 129).
Aa
White text reads best on this color (10.21:1).
About this color
#233D81 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.119 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.21:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #233D81 |
| RGB | rgb(35, 61, 129) |
| HSL | hsl(223, 57%, 32%) |
| OKLCH | oklch(38% 0.119 265.4) |
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 #233D81 | 10.21:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #233D81 | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #233D81 text on white | 10.21:1 | AAA | Lc 93.4 | Preferred for body text |
| #233D81 text on black | 2.05:1 | Fails | Lc -9.1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A5C0FB
oklch(80.9% 0.089 265.4)
-
Step 400
400
#759DF9
oklch(70.7% 0.142 265.2)
-
Step 500
500
#5381F7
oklch(63.1% 0.183 265.4)
-
Step 600
600
#3967E5
oklch(55.6% 0.198 265.2)
-
Step 700
700
#2C55C7
oklch(49.1% 0.184 265.1)
-
Step 800
800
#2546A1
oklch(42.7% 0.153 265.3)
-
Step 900
900 (this color)
#233D81
oklch(38% 0.119 265.4)
-
Step 950
950
#14244B
oklch(27.1% 0.075 265)
#233D81 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) | #134683 | 0.026 |
| Deuteranopia (no green cones) | #003D80 | 0.024 |
| Tritanopia (no blue cones) | #004D59 | 0.095 |
| Achromatopsia (no color) | #414141 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D81
#233D81
oklch(38% 0.119 265.4)
- #553F00
#553F00
oklch(38.1% 0.078 86.2)
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 #233D81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Cobalt #1E488F ΔE 0.036
- Marine Blue #01386A ΔE 0.051
- Light Navy #155084 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.062
- Dusk Blue #26538D ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.067
Use #233D81 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.