#2A3661
Closest named color: Prussian Blue (#1D3557). oklch(34.5% 0.077 270.2), rgb(42, 54, 97).
Aa
White text reads best on this color (11.67:1).
About this color
#2A3661 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.077 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.67:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #2A3661 |
| RGB | rgb(42, 54, 97) |
| HSL | hsl(227, 40%, 27%) |
| OKLCH | oklch(34.5% 0.077 270.2) |
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 #2A3661 | 11.67:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #2A3661 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #2A3661 text on white | 11.67:1 | AAA | Lc 96.7 | Preferred for body text |
| #2A3661 text on black | 1.79:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2BFE7
oklch(80.8% 0.058 270.9)
-
Step 400
400
#8A9EDB
oklch(70.7% 0.093 270)
-
Step 500
500
#6E85D1
oklch(63.2% 0.118 270)
-
Step 600
600
#576DBE
oklch(55.6% 0.128 270.4)
-
Step 700
700
#475BA4
oklch(49.2% 0.119 270)
-
Step 800
800
#3A4A85
oklch(42.6% 0.1 270.3)
-
Step 900
900 (this color)
#2A3661
oklch(34.5% 0.077 270.2)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#2A3661 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) | #243B63 | 0.016 |
| Deuteranopia (no green cones) | #1E3660 | 0.016 |
| Tritanopia (no blue cones) | #0F3F46 | 0.069 |
| Achromatopsia (no color) | #383838 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3661
#2A3661
oklch(34.5% 0.077 270.2)
- #473700
#473700
oklch(34.5% 0.07 90.6)
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 #2A3661, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Marine Blue #01386A ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.045
- Marine #042E60 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.054
- Twilight Blue #0A437A ΔE 0.055
- Midnight Green #073B4C ΔE 0.056
- Gunmetal #293241 ΔE 0.056
Use #2A3661 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.