#18417D
Closest named color: Twilight Blue (#0A437A). oklch(38.2% 0.112 258.3), rgb(24, 65, 125).
Aa
White text reads best on this color (10.04:1).
About this color
#18417D is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.112 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.011 away. White text reads best on it, at 10.04:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.09:1 |
| White text | 10.04:1 |
Values
| HEX | #18417D |
| RGB | rgb(24, 65, 125) |
| HSL | hsl(216, 68%, 29%) |
| OKLCH | oklch(38.2% 0.112 258.3) |
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 #18417D | 10.04:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #18417D | 2.09:1 | Fails | Lc 11.0 | Not readable |
| #18417D text on white | 10.04:1 | AAA | Lc 92.9 | Preferred for body text |
| #18417D text on black | 2.09:1 | Fails | Lc -9.5 | 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
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#A0C3F7
oklch(81% 0.083 258.1)
-
Step 400
400
#6BA1F3
oklch(70.7% 0.134 258.5)
-
Step 500
500
#4187EF
oklch(63.1% 0.172 258.4)
-
Step 600
600
#1E6EDD
oklch(55.6% 0.186 258.3)
-
Step 700
700
#0F5BC0
oklch(49.1% 0.173 258.3)
-
Step 800
800
#114B9B
oklch(42.6% 0.143 258.2)
-
Step 900
900 (this color)
#18417D
oklch(38.2% 0.112 258.3)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#18417D 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) | #21477F | 0.021 |
| Deuteranopia (no green cones) | #073E7C | 0.015 |
| Tritanopia (no blue cones) | #004F59 | 0.085 |
| Achromatopsia (no color) | #424242 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18417D
#18417D
oklch(38.2% 0.112 258.3)
- #5A3D00
#5A3D00
oklch(38.3% 0.08 78.5)
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 #18417D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.011
- Cobalt #1E488F ΔE 0.036
- Light Navy #155084 ΔE 0.044
- Marine Blue #01386A ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.055
- Dusk Blue #26538D ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.066
Use #18417D 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.