#23317D
Closest named color: Marine Blue (#01386A). oklch(35.1% 0.129 270.4), rgb(35, 49, 125).
Aa
White text reads best on this color (11.62:1).
About this color
#23317D is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.129 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.047 away. White text reads best on it, at 11.62:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.62:1 |
Values
| HEX | #23317D |
| RGB | rgb(35, 49, 125) |
| HSL | hsl(231, 56%, 31%) |
| OKLCH | oklch(35.1% 0.129 270.4) |
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 #23317D | 11.62:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #23317D | 1.80:1 | Fails | Lc 7.6 | Not readable |
| #23317D text on white | 11.62:1 | AAA | Lc 96.3 | Preferred for body text |
| #23317D text on black | 1.80:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FD
oklch(93.5% 0.028 270.4)
-
Step 200
200
#CBD8FE
oklch(88.5% 0.054 270.4)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#4760EF
oklch(55.7% 0.215 270.2)
-
Step 700
700
#3A4ED0
oklch(49.2% 0.2 270.4)
-
Step 800
800
#2F41A8
oklch(42.8% 0.166 270.2)
-
Step 900
900 (this color)
#23317D
oklch(35.1% 0.129 270.4)
-
Step 950
950
#18224E
oklch(27.1% 0.082 270.4)
#23317D 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) | #003D80 | 0.037 |
| Deuteranopia (no green cones) | #00357C | 0.027 |
| Tritanopia (no blue cones) | #004452 | 0.105 |
| Achromatopsia (no color) | #393939 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23317D
#23317D
oklch(35.1% 0.129 270.4)
- #493900
#493900
oklch(35.2% 0.072 91.1)
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 #23317D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.047
- Twilight Blue #0A437A ΔE 0.051
- Marine #042E60 ΔE 0.061
- Midnight Blue #191970 ΔE 0.065
- Cobalt #1E488F ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.069
- Royal #0C1793 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.072
Use #23317D 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.