#23377D
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.121 267.9), rgb(35, 55, 125).
Aa
White text reads best on this color (10.97:1).
About this color
#23377D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.121 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.97:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.97:1 |
Values
| HEX | #23377D |
| RGB | rgb(35, 55, 125) |
| HSL | hsl(227, 56%, 31%) |
| OKLCH | oklch(36.4% 0.121 267.9) |
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 #23377D | 10.97:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #23377D | 1.91:1 | Fails | Lc 8.9 | Not readable |
| #23377D text on white | 10.97:1 | AAA | Lc 95.0 | Preferred for body text |
| #23377D text on black | 1.91:1 | Fails | Lc -7.6 | 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
#CBD9FC
oklch(88.6% 0.051 268.1)
-
Step 300
300
#A7BFFC
oklch(80.9% 0.091 267.7)
-
Step 400
400
#799BFB
oklch(70.6% 0.146 267.8)
-
Step 500
500
#597FF8
oklch(63.1% 0.185 267.7)
-
Step 600
600
#4164E7
oklch(55.5% 0.202 267.8)
-
Step 700
700
#3452C9
oklch(49.1% 0.188 267.9)
-
Step 800
800
#2B44A3
oklch(42.7% 0.156 267.9)
-
Step 900
900 (this color)
#23377D
oklch(36.4% 0.121 267.9)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#23377D 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) | #02417F | 0.032 |
| Deuteranopia (no green cones) | #00387C | 0.026 |
| Tritanopia (no blue cones) | #004854 | 0.099 |
| Achromatopsia (no color) | #3C3C3C | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23377D
#23377D
oklch(36.4% 0.121 267.9)
- #4F3B00
#4F3B00
oklch(36.4% 0.075 87.1)
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 #23377D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.044
- Cobalt #1E488F ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.064
- Marine #042E60 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.067
- Light Navy #155084 ΔE 0.070
- Blueberry #464196 ΔE 0.073
Use #23377D 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.