#18457C
Closest named color: Twilight Blue (#0A437A). oklch(39.1% 0.105 255.5), rgb(24, 69, 124).
Aa
White text reads best on this color (9.62:1).
About this color
#18457C is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.105 and its hue 255°. 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 9.62:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.18:1 |
| White text | 9.62:1 |
Values
| HEX | #18457C |
| RGB | rgb(24, 69, 124) |
| HSL | hsl(213, 68%, 29%) |
| OKLCH | oklch(39.1% 0.105 255.5) |
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 #18457C | 9.62:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #18457C | 2.18:1 | Fails | Lc 12.0 | Not readable |
| #18457C text on white | 9.62:1 | AAA | Lc 91.9 | Preferred for body text |
| #18457C 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9FC3F3
oklch(80.8% 0.079 255.7)
-
Step 400
400
#69A3EE
oklch(70.7% 0.126 255.4)
-
Step 500
500
#3D8AE8
oklch(63.2% 0.161 255.2)
-
Step 600
600
#1571D7
oklch(55.6% 0.176 255.6)
-
Step 700
700
#025EBA
oklch(49.1% 0.163 255.5)
-
Step 800
800
#0A4D96
oklch(42.6% 0.135 255.4)
-
Step 900
900 (this color)
#18457C
oklch(39.1% 0.105 255.5)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#18457C 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) | #2A4A7E | 0.024 |
| Deuteranopia (no green cones) | #17417B | 0.012 |
| Tritanopia (no blue cones) | #00525A | 0.080 |
| Achromatopsia (no color) | #454545 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18457C
#18457C
oklch(39.1% 0.105 255.5)
- #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 #18457C, 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 0.033
- Light Navy #155084 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.044
- Dusk Blue #26538D ΔE 0.050
- Marine Blue #01386A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.068
Use #18457C 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.