#23377B
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.118 267.7), rgb(35, 55, 123).
Aa
White text reads best on this color (11.02:1).
About this color
#23377B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.118 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.036 away. White text reads best on it, at 11.02:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.02:1 |
Values
| HEX | #23377B |
| RGB | rgb(35, 55, 123) |
| HSL | hsl(226, 56%, 31%) |
| OKLCH | oklch(36.2% 0.118 267.7) |
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 #23377B | 11.02:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #23377B | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #23377B text on white | 11.02:1 | AAA | Lc 95.2 | Preferred for body text |
| #23377B text on black | 1.90:1 | Fails | Lc -7.5 | 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
#CBD9FB
oklch(88.6% 0.049 267.7)
-
Step 300
300
#A8BFFB
oklch(80.9% 0.089 268.2)
-
Step 400
400
#7A9CF9
oklch(70.8% 0.142 267.5)
-
Step 500
500
#5A80F6
oklch(63.2% 0.181 267.6)
-
Step 600
600
#4265E5
oklch(55.6% 0.198 267.8)
-
Step 700
700
#3553C7
oklch(49.1% 0.184 267.9)
-
Step 800
800
#2C45A1
oklch(42.8% 0.152 267.9)
-
Step 900
900 (this color)
#23377B
oklch(36.2% 0.118 267.7)
-
Step 950
950
#17234B
oklch(27% 0.076 268.4)
#23377B 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) | #07407D | 0.029 |
| Deuteranopia (no green cones) | #00387A | 0.026 |
| Tritanopia (no blue cones) | #004753 | 0.096 |
| Achromatopsia (no color) | #3C3C3C | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23377B
#23377B
oklch(36.2% 0.118 267.7)
- #4E3B00
#4E3B00
oklch(36.3% 0.074 88.2)
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 #23377B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Marine Blue #01386A ΔE 0.041
- Cobalt #1E488F ΔE 0.055
- Marine #042E60 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.065
- Light Navy #155084 ΔE 0.071
- Blueberry #464196 ΔE 0.075
Use #23377B 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.