#18457D
Closest named color: Twilight Blue (#0A437A). oklch(39.2% 0.107 255.8), rgb(24, 69, 125).
Aa
White text reads best on this color (9.60:1).
About this color
#18457D is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.107 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.012 away. White text reads best on it, at 9.60:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.18:1 |
| White text | 9.60:1 |
Values
| HEX | #18457D |
| RGB | rgb(24, 69, 125) |
| HSL | hsl(213, 68%, 29%) |
| OKLCH | oklch(39.2% 0.107 255.8) |
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 #18457D | 9.60:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #18457D | 2.18:1 | Fails | Lc 12.1 | Not readable |
| #18457D text on white | 9.60:1 | AAA | Lc 91.9 | Preferred for body text |
| #18457D text on black | 2.18:1 | Fails | Lc -10.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#69A3EF
oklch(70.8% 0.128 255.7)
-
Step 500
500
#3D89EA
oklch(63.1% 0.164 256)
-
Step 600
600
#1471D8
oklch(55.7% 0.177 255.7)
-
Step 700
700
#025EBB
oklch(49.2% 0.164 255.6)
-
Step 800
800
#0A4D97
oklch(42.7% 0.136 255.7)
-
Step 900
900 (this color)
#18457D
oklch(39.2% 0.107 255.8)
-
Step 950
950
#0D2647
oklch(26.9% 0.069 256.4)
#18457D 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) | #294A7F | 0.023 |
| Deuteranopia (no green cones) | #16417C | 0.012 |
| Tritanopia (no blue cones) | #00525B | 0.080 |
| Achromatopsia (no color) | #454545 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18457D
#18457D
oklch(39.2% 0.107 255.8)
- #5E3E00
#5E3E00
oklch(39.1% 0.082 76)
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 #18457D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.012
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.044
- Dusk Blue #26538D ΔE 0.050
- Marine Blue #01386A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.067
Use #18457D 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.