#18577F
Closest named color: Deep Sea Blue (#015482). oklch(43.8% 0.09 241.7), rgb(24, 87, 127).
Aa
White text reads best on this color (7.75:1).
About this color
#18577F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.090 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.016 away. White text reads best on it, at 7.75:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.70:1 |
| White text | 7.75:1 |
Values
| HEX | #18577F |
| RGB | rgb(24, 87, 127) |
| HSL | hsl(203, 68%, 30%) |
| OKLCH | oklch(43.8% 0.09 241.7) |
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 #18577F | 7.75:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #18577F | 2.70:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #18577F text on white | 7.75:1 | AAA | Lc 86.6 | Fine for body text |
| #18577F text on black | 2.70:1 | Fails | Lc -15.5 | 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 800.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C6E0
oklch(81% 0.053 240.5)
-
Step 400
400
#70A7D1
oklch(70.6% 0.085 242.3)
-
Step 500
500
#4691C5
oklch(63.1% 0.108 241.6)
-
Step 600
600
#227AB1
oklch(55.5% 0.117 241.7)
-
Step 700
700
#126799
oklch(49.2% 0.109 241.7)
-
Step 800
800 (this color)
#18577F
oklch(43.8% 0.09 241.7)
-
Step 900
900
#194663
oklch(37.8% 0.07 240.6)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#18577F 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) | #445881 | 0.044 |
| Deuteranopia (no green cones) | #364E7E | 0.034 |
| Tritanopia (no blue cones) | #006165 | 0.062 |
| Achromatopsia (no color) | #525252 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18577F
#18577F
oklch(43.8% 0.09 241.7)
- #754513
#754513
oklch(43.9% 0.09 61.7)
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 #18577F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.016
- Light Navy #155084 ΔE 0.025
- Light Navy Blue #2E5A88 ΔE 0.026
- Dusk Blue #26538D ΔE 0.030
- YInMn Blue #415A77 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.047
- Petrol #005F6A ΔE 0.050
- Peacock Blue #016795 ΔE 0.053
Use #18577F 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.