#2A3872
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.101 270.5), rgb(42, 56, 114).
Aa
White text reads best on this color (11.01:1).
About this color
#2A3872 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.101 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.038 away. White text reads best on it, at 11.01:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.01:1 |
Values
| HEX | #2A3872 |
| RGB | rgb(42, 56, 114) |
| HSL | hsl(228, 46%, 31%) |
| OKLCH | oklch(36.2% 0.101 270.5) |
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 #2A3872 | 11.01:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #2A3872 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #2A3872 text on white | 11.01:1 | AAA | Lc 95.3 | Preferred for body text |
| #2A3872 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED8F6
oklch(88.4% 0.043 270.9)
-
Step 300
300
#AEBFF2
oklch(80.9% 0.075 270.3)
-
Step 400
400
#849CEC
oklch(70.7% 0.121 270.4)
-
Step 500
500
#6781E6
oklch(63.1% 0.154 270.6)
-
Step 600
600
#4F68D4
oklch(55.6% 0.168 270.3)
-
Step 700
700
#4156B8
oklch(49.2% 0.156 270.5)
-
Step 800
800
#354795
oklch(42.8% 0.129 270.3)
-
Step 900
900 (this color)
#2A3872
oklch(36.2% 0.101 270.5)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#2A3872 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) | #1B3F74 | 0.024 |
| Deuteranopia (no green cones) | #0D3971 | 0.028 |
| Tritanopia (no blue cones) | #00454F | 0.088 |
| Achromatopsia (no color) | #3C3C3C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3872
#2A3872
oklch(36.2% 0.101 270.5)
- #4C3B00
#4C3B00
oklch(36.1% 0.074 90.5)
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 #2A3872, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.038
- Marine Blue #01386A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.051
- Marine #042E60 ΔE 0.060
- Cobalt #1E488F ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.070
Use #2A3872 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.