#28559A
Closest named color: Dusk Blue (#26538D). oklch(45.6% 0.123 258.8), rgb(40, 85, 154).
Aa
White text reads best on this color (7.35:1).
About this color
#28559A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.123 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.022 away. White text reads best on it, at 7.35:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.85:1 |
| White text | 7.35:1 |
Values
| HEX | #28559A |
| RGB | rgb(40, 85, 154) |
| HSL | hsl(216, 59%, 38%) |
| OKLCH | oklch(45.6% 0.123 258.8) |
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 #28559A | 7.35:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #28559A | 2.85:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #28559A text on white | 7.35:1 | AAA | Lc 85.2 | Fine for body text |
| #28559A text on black | 2.85:1 | Fails | Lc -16.8 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A5C2F0
oklch(80.9% 0.073 259.5)
-
Step 400
400
#74A2E8
oklch(70.8% 0.115 258.6)
-
Step 500
500
#4F88E1
oklch(63% 0.147 259)
-
Step 600
600
#3270CF
oklch(55.6% 0.16 258.9)
-
Step 700
700
#255DB3
oklch(49% 0.149 259)
-
Step 800
800 (this color)
#28559A
oklch(45.6% 0.123 258.8)
-
Step 900
900
#1F4174
oklch(37.8% 0.096 258.4)
-
Step 950
950
#132644
oklch(27% 0.061 259.2)
#28559A 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) | #335C9D | 0.024 |
| Deuteranopia (no green cones) | #1D5199 | 0.016 |
| Tritanopia (no blue cones) | #006570 | 0.096 |
| Achromatopsia (no color) | #565656 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28559A
#28559A
oklch(45.6% 0.123 258.8)
- #734F00
#734F00
oklch(45.5% 0.095 78.4)
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 #28559A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.036
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.047
- Twilight #4E518B ΔE 0.049
- Dusky Blue #475F94 ΔE 0.049
Use #28559A 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.