#15559B
Closest named color: Dusk Blue (#26538D). oklch(45% 0.13 254.4), rgb(21, 85, 155).
Aa
White text reads best on this color (7.48:1).
About this color
#15559B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.130 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.024 away. White text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.48:1 |
Values
| HEX | #15559B |
| RGB | rgb(21, 85, 155) |
| HSL | hsl(211, 76%, 35%) |
| OKLCH | oklch(45% 0.13 254.4) |
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 #15559B | 7.48:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #15559B | 2.80:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #15559B text on white | 7.48:1 | AAA | Lc 85.5 | Fine for body text |
| #15559B text on black | 2.80:1 | Fails | Lc -16.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#9FC4F1
oklch(80.9% 0.075 253.6)
-
Step 400
400
#6AA3EB
oklch(70.6% 0.122 254.9)
-
Step 500
500
#3E8AE4
oklch(63% 0.155 254.5)
-
Step 600
600
#1672D3
oklch(55.6% 0.17 254.6)
-
Step 700
700
#035FB6
oklch(49% 0.157 254.4)
-
Step 800
800 (this color)
#15559B
oklch(45% 0.13 254.4)
-
Step 900
900
#144276
oklch(37.8% 0.102 254.3)
-
Step 950
950
#0E2745
oklch(27.1% 0.064 254.6)
#15559B 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) | #305B9E | 0.029 |
| Deuteranopia (no green cones) | #124F9A | 0.017 |
| Tritanopia (no blue cones) | #006670 | 0.098 |
| Achromatopsia (no color) | #555555 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15559B
#15559B
oklch(45% 0.13 254.4)
- #744C00
#744C00
oklch(45% 0.095 74.4)
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 #15559B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.024
- Cobalt #1E488F ΔE 0.039
- Light Navy #155084 ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.043
- Peacock Blue #016795 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.060
Use #15559B 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.