#15538F
Closest named color: Dusk Blue (#26538D). oklch(43.7% 0.116 251.9), rgb(21, 83, 143).
Aa
White text reads best on this color (7.87:1).
About this color
#15538F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.116 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.012 away. White text reads best on it, at 7.87:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.66:1 |
| White text | 7.87:1 |
Values
| HEX | #15538F |
| RGB | rgb(21, 83, 143) |
| HSL | hsl(210, 74%, 32%) |
| OKLCH | oklch(43.7% 0.116 251.9) |
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 #15538F | 7.87:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #15538F | 2.66:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #15538F text on white | 7.87:1 | AAA | Lc 86.9 | Fine for body text |
| #15538F text on black | 2.66:1 | Fails | Lc -15.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A1C4EC
oklch(80.9% 0.068 252)
-
Step 400
400
#6DA5E2
oklch(70.8% 0.108 251.5)
-
Step 500
500
#438CDA
oklch(63% 0.139 252.2)
-
Step 600
600
#1E75C8
oklch(55.7% 0.151 252)
-
Step 700
700
#0D62AD
oklch(49.2% 0.14 251.8)
-
Step 800
800 (this color)
#15538F
oklch(43.7% 0.116 251.9)
-
Step 900
900
#174370
oklch(37.7% 0.091 252)
-
Step 950
950
#0F2741
oklch(26.8% 0.057 252.3)
#15538F 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) | #355791 | 0.031 |
| Deuteranopia (no green cones) | #204D8E | 0.017 |
| Tritanopia (no blue cones) | #00616A | 0.085 |
| Achromatopsia (no color) | #515151 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15538F
#15538F
oklch(43.7% 0.116 251.9)
- #714800
#714800
oklch(43.8% 0.094 72.3)
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 #15538F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.012
- Light Navy #155084 ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.024
- Cobalt #1E488F ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.057
- Peacock Blue #016795 ΔE 0.058
Use #15538F 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.