#2A3577
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.113 272.3), rgb(42, 53, 119).
Aa
White text reads best on this color (11.20:1).
About this color
#2A3577 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.113 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.044 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #2A3577 |
| RGB | rgb(42, 53, 119) |
| HSL | hsl(231, 48%, 32%) |
| OKLCH | oklch(35.9% 0.113 272.3) |
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 #2A3577 | 11.20:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #2A3577 | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #2A3577 text on white | 11.20:1 | AAA | Lc 95.6 | Preferred for body text |
| #2A3577 text on black | 1.87:1 | 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
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8F9
oklch(88.5% 0.047 272.1)
-
Step 300
300
#ADBEF8
oklch(80.9% 0.084 271.8)
-
Step 400
400
#849AF5
oklch(70.8% 0.136 272.2)
-
Step 500
500
#677DF1
oklch(63% 0.174 272.4)
-
Step 600
600
#5163DF
oklch(55.5% 0.188 272.5)
-
Step 700
700
#4251C2
oklch(49% 0.176 272.4)
-
Step 800
800
#36439D
oklch(42.6% 0.146 272.4)
-
Step 900
900 (this color)
#2A3577
oklch(35.9% 0.113 272.3)
-
Step 950
950
#1B2349
oklch(27.1% 0.071 272)
#2A3577 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) | #0B3F79 | 0.036 |
| Deuteranopia (no green cones) | #003876 | 0.035 |
| Tritanopia (no blue cones) | #004450 | 0.096 |
| Achromatopsia (no color) | #3B3B3B | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3577
#2A3577
oklch(35.9% 0.113 272.3)
- #4B3B00
#4B3B00
oklch(35.9% 0.073 91.6)
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 #2A3577, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.044
- Twilight Blue #0A437A ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.060
- Marine #042E60 ΔE 0.062
- Cobalt #1E488F ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.063
- Blueberry #464196 ΔE 0.075
- Light Navy #155084 ΔE 0.077
Use #2A3577 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.