#18437A
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.105 256.2), rgb(24, 67, 122).
Aa
White text reads best on this color (9.89:1).
About this color
#18437A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.105 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.008 away. White text reads best on it, at 9.89:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #18437A |
| RGB | rgb(24, 67, 122) |
| HSL | hsl(214, 67%, 29%) |
| OKLCH | oklch(38.5% 0.105 256.2) |
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 #18437A | 9.89:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #18437A | 2.12:1 | Fails | Lc 11.3 | Not readable |
| #18437A text on white | 9.89:1 | AAA | Lc 92.6 | Preferred for body text |
| #18437A text on black | 2.12:1 | Fails | Lc -9.8 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A0C3F3
oklch(80.9% 0.078 256.4)
-
Step 400
400
#6BA2EE
oklch(70.6% 0.126 256.7)
-
Step 500
500
#4089E8
oklch(63.1% 0.161 256.2)
-
Step 600
600
#1B71D6
oklch(55.7% 0.174 256)
-
Step 700
700
#0B5EBA
oklch(49.2% 0.162 256.1)
-
Step 800
800
#0F4D96
oklch(42.7% 0.134 256.1)
-
Step 900
900 (this color)
#18437A
oklch(38.5% 0.105 256.2)
-
Step 950
950
#0E2646
oklch(26.9% 0.067 256.5)
#18437A 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) | #27487C | 0.022 |
| Deuteranopia (no green cones) | #153F79 | 0.013 |
| Tritanopia (no blue cones) | #005058 | 0.081 |
| Achromatopsia (no color) | #434343 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18437A
#18437A
oklch(38.5% 0.105 256.2)
- #5C3D00
#5C3D00
oklch(38.6% 0.081 76.6)
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 #18437A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.008
- Cobalt #1E488F ΔE 0.038
- Light Navy #155084 ΔE 0.040
- Marine Blue #01386A ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.068
Use #18437A 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.