#23307C
Closest named color: Marine Blue (#01386A). oklch(34.8% 0.129 270.7), rgb(35, 48, 124).
Aa
White text reads best on this color (11.76:1).
About this color
#23307C is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.129 and its hue 271°. 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 11.76:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.78:1 |
| White text | 11.76:1 |
Values
| HEX | #23307C |
| RGB | rgb(35, 48, 124) |
| HSL | hsl(231, 56%, 31%) |
| OKLCH | oklch(34.8% 0.129 270.7) |
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 #23307C | 11.76:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #23307C | 1.78:1 | Fails | Lc 7.3 | Not readable |
| #23307C text on white | 11.76:1 | AAA | Lc 96.6 | Preferred for body text |
| #23307C text on black | 1.78:1 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
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
#5F7BFF
oklch(63.1% 0.198 270.7)
-
Step 600
600
#495FEF
oklch(55.6% 0.216 270.9)
-
Step 700
700
#3B4DD0
oklch(49.1% 0.201 270.8)
-
Step 800
800
#3040A8
oklch(42.6% 0.167 270.8)
-
Step 900
900 (this color)
#23307C
oklch(34.8% 0.129 270.7)
-
Step 950
950
#18224E
oklch(27.1% 0.082 270.4)
#23307C 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) | #003C7F | 0.037 |
| Deuteranopia (no green cones) | #00347B | 0.028 |
| Tritanopia (no blue cones) | #004351 | 0.105 |
| Achromatopsia (no color) | #383838 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23307C
#23307C
oklch(34.8% 0.129 270.7)
- #483800
#483800
oklch(34.8% 0.071 90.8)
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 #23307C, 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 0.053
- Marine #042E60 ΔE 0.059
- Midnight Blue #191970 ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.069
- Royal #0C1793 ΔE 0.069
- Cobalt #1E488F ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.074
Use #23307C 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.