#18437F
Closest named color: Twilight Blue (#0A437A). oklch(38.8% 0.112 257.6), rgb(24, 67, 127).
Aa
White text reads best on this color (9.77:1).
About this color
#18437F is a dark, moderately saturated blue. In OKLCH its lightness is 39%, 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 0.012 away. White text reads best on it, at 9.77:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.77:1 |
Values
| HEX | #18437F |
| RGB | rgb(24, 67, 127) |
| HSL | hsl(215, 68%, 30%) |
| OKLCH | oklch(38.8% 0.112 257.6) |
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 #18437F | 9.77:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #18437F | 2.14:1 | Fails | Lc 11.7 | Not readable |
| #18437F text on white | 9.77:1 | AAA | Lc 92.3 | Preferred for body text |
| #18437F text on black | 2.14:1 | Fails | Lc -10.1 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#69A2F3
oklch(70.8% 0.134 257.3)
-
Step 500
500
#3E87EF
oklch(63% 0.173 257.8)
-
Step 600
600
#196EDD
oklch(55.5% 0.187 257.7)
-
Step 700
700
#085CC0
oklch(49.2% 0.173 257.5)
-
Step 800
800
#0D4B9B
oklch(42.6% 0.144 257.7)
-
Step 900
900 (this color)
#18437F
oklch(38.8% 0.112 257.6)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#18437F 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) | #234981 | 0.022 |
| Deuteranopia (no green cones) | #0B3F7E | 0.016 |
| Tritanopia (no blue cones) | #00515A | 0.086 |
| Achromatopsia (no color) | #444444 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18437F
#18437F
oklch(38.8% 0.112 257.6)
- #5C3E00
#5C3E00
oklch(38.8% 0.081 77.9)
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 #18437F, 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 0.030
- Light Navy #155084 ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.050
- Marine Blue #01386A ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.066
Use #18437F 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.