#23457C
Closest named color: Twilight Blue (#0A437A). oklch(39.5% 0.101 259.6), rgb(35, 69, 124).
Aa
White text reads best on this color (9.48:1).
About this color
#23457C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.101 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #23457C |
| RGB | rgb(35, 69, 124) |
| HSL | hsl(217, 56%, 31%) |
| OKLCH | oklch(39.5% 0.101 259.6) |
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 #23457C | 9.48:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #23457C | 2.21:1 | Fails | Lc 12.3 | Not readable |
| #23457C text on white | 9.48:1 | AAA | Lc 91.7 | Preferred for body text |
| #23457C text on black | 2.21:1 | Fails | Lc -10.7 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#72A1EC
oklch(70.7% 0.122 259.4)
-
Step 500
500
#4D87E6
oklch(63% 0.156 259.8)
-
Step 600
600
#306FD4
oklch(55.6% 0.169 259.6)
-
Step 700
700
#235CB8
oklch(49.1% 0.157 259.8)
-
Step 800
800
#1E4C95
oklch(42.8% 0.13 259.5)
-
Step 900
900 (this color)
#23457C
oklch(39.5% 0.101 259.6)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#23457C 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) | #2B4A7E | 0.018 |
| Deuteranopia (no green cones) | #1C427B | 0.012 |
| Tritanopia (no blue cones) | #00525A | 0.082 |
| Achromatopsia (no color) | #464646 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23457C
#23457C
oklch(39.5% 0.101 259.6)
- #5D4000
#5D4000
oklch(39.4% 0.082 79.6)
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 #23457C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Cobalt #1E488F ΔE 0.032
- Light Navy #155084 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.044
- Dusk Blue #26538D ΔE 0.047
- Marine Blue #01386A ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.060
Use #23457C 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.