#18436B
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.083 249.7), rgb(24, 67, 107).
Aa
White text reads best on this color (10.22:1).
About this color
#18436B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.083 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 10.22:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #18436B |
| RGB | rgb(24, 67, 107) |
| HSL | hsl(209, 63%, 26%) |
| OKLCH | oklch(37.4% 0.083 249.7) |
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 #18436B | 10.22:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #18436B | 2.05:1 | Fails | Lc 10.5 | Not readable |
| #18436B text on white | 10.22:1 | AAA | Lc 93.5 | Preferred for body text |
| #18436B text on black | 2.05:1 | Fails | Lc -9.0 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A2C4E8
oklch(80.8% 0.063 250.1)
-
Step 400
400
#6FA5DD
oklch(70.7% 0.1 250.3)
-
Step 500
500
#458ED3
oklch(63.1% 0.127 249.4)
-
Step 600
600
#2176C1
oklch(55.5% 0.14 250)
-
Step 700
700
#1263A6
oklch(49% 0.129 249.8)
-
Step 800
800
#145187
oklch(42.7% 0.108 250.1)
-
Step 900
900 (this color)
#18436B
oklch(37.4% 0.083 249.7)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#18436B 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) | #31456D | 0.028 |
| Deuteranopia (no green cones) | #253D6A | 0.020 |
| Tritanopia (no blue cones) | #004C52 | 0.060 |
| Achromatopsia (no color) | #414141 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18436B
#18436B
oklch(37.4% 0.083 249.7)
- #5C3800
#5C3800
oklch(37.5% 0.081 70)
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 #18436B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.035
- Marine Blue #01386A ΔE 0.040
- Charcoal #264653 ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.058
Use #18436B 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.