#2A3585
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.134 272.2), rgb(42, 53, 133).
Aa
White text reads best on this color (10.78:1).
About this color
#2A3585 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.134 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.049 away. White text reads best on it, at 10.78:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.78:1 |
Values
| HEX | #2A3585 |
| RGB | rgb(42, 53, 133) |
| HSL | hsl(233, 52%, 34%) |
| OKLCH | oklch(37.1% 0.134 272.2) |
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 #2A3585 | 10.78:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #2A3585 | 1.94:1 | Fails | Lc 9.3 | Not readable |
| #2A3585 text on white | 10.78:1 | AAA | Lc 94.6 | Preferred for body text |
| #2A3585 text on black | 1.94:1 | Fails | Lc -8.0 | Not readable |
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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFF
oklch(63.2% 0.198 272.1)
-
Step 600
600
#4C5CF2
oklch(55.5% 0.223 272.2)
-
Step 700
700
#3E4AD3
oklch(49% 0.208 272.2)
-
Step 800
800
#333EAB
oklch(42.7% 0.172 272.3)
-
Step 900
900 (this color)
#2A3585
oklch(37.1% 0.134 272.2)
-
Step 950
950
#19214F
oklch(27% 0.085 272.1)
#2A3585 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) | #004288 | 0.041 |
| Deuteranopia (no green cones) | #003983 | 0.034 |
| Tritanopia (no blue cones) | #004957 | 0.111 |
| Achromatopsia (no color) | #3D3D3D | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3585
#2A3585
oklch(37.1% 0.134 272.2)
- #4E3E00
#4E3E00
oklch(37% 0.076 92.3)
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 #2A3585, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.054
- Marine Blue #01386A ΔE 0.060
- Blueberry #464196 ΔE 0.062
- Sapphire #2138AB ΔE 0.064
- Light Navy #155084 ΔE 0.075
- Royal #0C1793 ΔE 0.078
Use #2A3585 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.