#18497A
Closest named color: Twilight Blue (#0A437A). oklch(39.9% 0.098 251.7), rgb(24, 73, 122).
Aa
White text reads best on this color (9.23:1).
About this color
#18497A is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.098 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #18497A |
| RGB | rgb(24, 73, 122) |
| HSL | hsl(210, 67%, 29%) |
| OKLCH | oklch(39.9% 0.098 251.7) |
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 #18497A | 9.23:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #18497A | 2.27:1 | Fails | Lc 13.0 | Not readable |
| #18497A text on white | 9.23:1 | AAA | Lc 91.0 | Preferred for body text |
| #18497A text on black | 2.27:1 | Fails | Lc -11.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9EC4EF
oklch(80.8% 0.074 251.8)
-
Step 400
400
#67A5E7
oklch(70.7% 0.117 251.2)
-
Step 500
500
#398CE0
oklch(63% 0.15 251.7)
-
Step 600
600
#0674CE
oklch(55.5% 0.163 251.8)
-
Step 700
700
#0061AF
oklch(49% 0.146 251.8)
-
Step 800
800
#025090
oklch(42.7% 0.124 251.4)
-
Step 900
900 (this color)
#18497A
oklch(39.9% 0.098 251.7)
-
Step 950
950
#0C2743
oklch(26.8% 0.062 251.9)
#18497A 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) | #324C7C | 0.028 |
| Deuteranopia (no green cones) | #224379 | 0.018 |
| Tritanopia (no blue cones) | #00555B | 0.074 |
| Achromatopsia (no color) | #474747 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18497A
#18497A
oklch(39.9% 0.098 251.7)
- #643E00
#643E00
oklch(39.9% 0.086 70.8)
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 #18497A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Light Navy #155084 ΔE 0.024
- Deep Sea Blue #015482 ΔE 0.033
- Cobalt #1E488F ΔE 0.037
- Dusk Blue #26538D ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.060
- Marine Blue #01386A ΔE 0.060
Use #18497A 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.