#2B3D73
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.095 267.8), rgb(43, 61, 115).
Aa
White text reads best on this color (10.40:1).
About this color
#2B3D73 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.095 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 10.40:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.40:1 |
Values
| HEX | #2B3D73 |
| RGB | rgb(43, 61, 115) |
| HSL | hsl(225, 46%, 31%) |
| OKLCH | oklch(37.5% 0.095 267.8) |
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 #2B3D73 | 10.40:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #2B3D73 | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #2B3D73 text on white | 10.40:1 | AAA | Lc 94.0 | Preferred for body text |
| #2B3D73 text on black | 2.01:1 | Fails | Lc -8.6 | 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
#CED9F4
oklch(88.5% 0.039 267.9)
-
Step 300
300
#ADC0F0
oklch(81% 0.071 267.9)
-
Step 400
400
#829EE8
oklch(70.8% 0.113 267.7)
-
Step 500
500
#6383E1
oklch(63% 0.146 267.9)
-
Step 600
600
#4B6BCF
oklch(55.6% 0.158 267.7)
-
Step 700
700
#3D59B3
oklch(49.2% 0.146 267.7)
-
Step 800
800
#324991
oklch(42.7% 0.122 267.7)
-
Step 900
900 (this color)
#2B3D73
oklch(37.5% 0.095 267.8)
-
Step 950
950
#1A2444
oklch(26.9% 0.061 268.9)
#2B3D73 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) | #244375 | 0.018 |
| Deuteranopia (no green cones) | #193D72 | 0.020 |
| Tritanopia (no blue cones) | #004952 | 0.083 |
| Achromatopsia (no color) | #404040 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3D73
#2B3D73
oklch(37.5% 0.095 267.8)
- #523E00
#523E00
oklch(37.5% 0.077 88)
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 #2B3D73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Marine Blue #01386A ΔE 0.044
- Cobalt #1E488F ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.056
- Light Navy #155084 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.061
- Charcoal #264653 ΔE 0.069
Use #2B3D73 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.