#2A3574
Closest named color: Marine Blue (#01386A). oklch(35.7% 0.108 272.3), rgb(42, 53, 116).
Aa
White text reads best on this color (11.29:1).
About this color
#2A3574 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.108 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.041 away. White text reads best on it, at 11.29:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.85:1 |
| White text | 11.29:1 |
Values
| HEX | #2A3574 |
| RGB | rgb(42, 53, 116) |
| HSL | hsl(231, 47%, 31%) |
| OKLCH | oklch(35.7% 0.108 272.3) |
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 #2A3574 | 11.29:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #2A3574 | 1.85:1 | Fails | Lc 8.1 | Not readable |
| #2A3574 text on white | 11.29:1 | AAA | Lc 95.8 | Preferred for body text |
| #2A3574 text on black | 1.85:1 | Fails | Lc 0.0 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#AEBEF6
oklch(80.9% 0.081 272.1)
-
Step 400
400
#859AF1
oklch(70.6% 0.13 272.4)
-
Step 500
500
#687EED
oklch(63% 0.167 272.3)
-
Step 600
600
#5265DB
oklch(55.7% 0.18 272.3)
-
Step 700
700
#4353BE
oklch(49.1% 0.168 272.3)
-
Step 800
800
#37449A
oklch(42.6% 0.14 272.5)
-
Step 900
900 (this color)
#2A3574
oklch(35.7% 0.108 272.3)
-
Step 950
950
#1B2348
oklch(27% 0.069 271.9)
#2A3574 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) | #103E76 | 0.032 |
| Deuteranopia (no green cones) | #003773 | 0.036 |
| Tritanopia (no blue cones) | #00444F | 0.094 |
| Achromatopsia (no color) | #3A3A3A | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3574
#2A3574
oklch(35.7% 0.108 272.3)
- #4A3B00
#4A3B00
oklch(35.8% 0.073 92.8)
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 #2A3574, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.041
- Twilight Blue #0A437A ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.055
- Marine #042E60 ΔE 0.058
- Cobalt #1E488F ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.074
- Dark Blue Grey #1F3B4D ΔE 0.077
Use #2A3574 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.