#233D74
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.1 263.3), rgb(35, 61, 116).
Aa
White text reads best on this color (10.54:1).
About this color
#233D74 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.100 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.54:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.54:1 |
Values
| HEX | #233D74 |
| RGB | rgb(35, 61, 116) |
| HSL | hsl(221, 54%, 30%) |
| OKLCH | oklch(37.1% 0.1 263.3) |
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 #233D74 | 10.54:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #233D74 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #233D74 text on white | 10.54:1 | AAA | Lc 94.2 | Preferred for body text |
| #233D74 text on black | 1.99:1 | Fails | Lc -8.4 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#799FEB
oklch(70.6% 0.12 263.4)
-
Step 500
500
#5785E5
oklch(63% 0.153 263.4)
-
Step 600
600
#3D6DD3
oklch(55.6% 0.166 263.1)
-
Step 700
700
#305AB7
oklch(49.1% 0.155 263.5)
-
Step 800
800
#284A94
oklch(42.6% 0.128 263.4)
-
Step 900
900 (this color)
#233D74
oklch(37.1% 0.1 263.3)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#233D74 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) | #224376 | 0.018 |
| Deuteranopia (no green cones) | #133B73 | 0.017 |
| Tritanopia (no blue cones) | #004A52 | 0.083 |
| Achromatopsia (no color) | #3F3F3F | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D74
#233D74
oklch(37.1% 0.1 263.3)
- #533B00
#533B00
oklch(36.9% 0.076 82.8)
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 #233D74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.037
- Cobalt #1E488F ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Marine #042E60 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.067
Use #233D74 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.