#18759F
Closest named color: Ocean Blue (#03719C). oklch(53.1% 0.104 234.3), rgb(24, 117, 159).
Aa
White text reads best on this color (5.14:1).
About this color
#18759F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.104 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.015 away. White text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 4.08:1 |
| White text | 5.14:1 |
Values
| HEX | #18759F |
| RGB | rgb(24, 117, 159) |
| HSL | hsl(199, 74%, 36%) |
| OKLCH | oklch(53.1% 0.104 234.3) |
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 #18759F | 5.14:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #18759F | 4.08:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #18759F text on white | 5.14:1 | AA | Lc 75.0 | Fine for body text |
| #18759F text on black | 4.08:1 | AA large text | Lc -26.7 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF2
oklch(93.7% 0.013 233.7)
-
Step 200
200
#C9DCE8
oklch(88.4% 0.026 235.4)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#71A9C9
oklch(70.8% 0.075 234.4)
-
Step 500
500
#4793BB
oklch(63.2% 0.096 234.1)
-
Step 600
600 (this color)
#18759F
oklch(53.1% 0.104 234.3)
-
Step 700
700
#13698F
oklch(49.2% 0.097 234)
-
Step 800
800
#155574
oklch(42.6% 0.08 234.8)
-
Step 900
900
#1A475E
oklch(37.8% 0.063 234.2)
-
Step 950
950
#112A37
oklch(27.2% 0.039 233.4)
#18759F 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) | #6074A1 | 0.064 |
| Deuteranopia (no green cones) | #4F689E | 0.053 |
| Tritanopia (no blue cones) | #008083 | 0.064 |
| Achromatopsia (no color) | #6D6D6D | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18759F
#18759F
oklch(53.1% 0.104 234.3)
- #9A5A2B
#9A5A2B
oklch(53.2% 0.104 54.4)
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 #18759F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.015
- Sea Blue #047495 ΔE 0.018
- Muted Blue #3B719F ΔE 0.024
- Nice Blue #107AB0 ΔE 0.028
- Flat Blue #3C73A8 ΔE 0.029
- Ocean #017B92 ΔE 0.032
- Dull Blue #49759C ΔE 0.036
- Cerulean #457B9D ΔE 0.039
Use #18759F 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.