#2B3C73
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.097 268.5), rgb(43, 60, 115).
Aa
White text reads best on this color (10.51:1).
About this color
#2B3C73 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.097 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.032 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #2B3C73 |
| RGB | rgb(43, 60, 115) |
| HSL | hsl(226, 46%, 31%) |
| OKLCH | oklch(37.2% 0.097 268.5) |
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 #2B3C73 | 10.51:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #2B3C73 | 1.99:1 | Fails | Lc 9.7 | Not readable |
| #2B3C73 text on white | 10.51:1 | AAA | Lc 94.2 | Preferred for body text |
| #2B3C73 text on black | 1.99:1 | Fails | Lc -8.4 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#ADBFF0
oklch(80.8% 0.072 269)
-
Step 400
400
#829DE9
oklch(70.6% 0.116 268.4)
-
Step 500
500
#6483E2
oklch(63.1% 0.147 268.4)
-
Step 600
600
#4C6AD0
oklch(55.5% 0.161 268.4)
-
Step 700
700
#3E58B4
oklch(49.1% 0.149 268.6)
-
Step 800
800
#334892
oklch(42.6% 0.124 268.7)
-
Step 900
900 (this color)
#2B3C73
oklch(37.2% 0.097 268.5)
-
Step 950
950
#1A2444
oklch(26.9% 0.061 268.9)
#2B3C73 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) | #224375 | 0.021 |
| Deuteranopia (no green cones) | #173C72 | 0.022 |
| Tritanopia (no blue cones) | #004852 | 0.083 |
| Achromatopsia (no color) | #3F3F3F | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3C73
#2B3C73
oklch(37.2% 0.097 268.5)
- #513D00
#513D00
oklch(37.2% 0.076 87.7)
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 #2B3C73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.032
- Marine Blue #01386A ΔE 0.043
- Cobalt #1E488F ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.057
- Light Navy #155084 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.061
- Marine #042E60 ΔE 0.069
Use #2B3C73 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.