#2B3D71
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.092 267.5), rgb(43, 61, 113).
Aa
White text reads best on this color (10.45:1).
About this color
#2B3D71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.092 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #2B3D71 |
| RGB | rgb(43, 61, 113) |
| HSL | hsl(225, 45%, 31%) |
| OKLCH | oklch(37.3% 0.092 267.5) |
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 #2B3D71 | 10.45:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #2B3D71 | 2.00:1 | Fails | Lc 9.8 | Not readable |
| #2B3D71 text on white | 10.45:1 | AAA | Lc 94.1 | Preferred for body text |
| #2B3D71 text on black | 2.00:1 | Fails | Lc -8.5 | 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
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ADC0EE
oklch(80.9% 0.069 267.3)
-
Step 400
400
#829EE6
oklch(70.7% 0.111 267.3)
-
Step 500
500
#6484DF
oklch(63.1% 0.142 267.6)
-
Step 600
600
#4C6CCC
oklch(55.6% 0.153 267.4)
-
Step 700
700
#3D59B1
oklch(49% 0.144 267.6)
-
Step 800
800
#32498F
oklch(42.6% 0.119 267.5)
-
Step 900
900 (this color)
#2B3D71
oklch(37.3% 0.092 267.5)
-
Step 950
950
#1A2543
oklch(27.1% 0.058 267.3)
#2B3D71 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) | #264373 | 0.018 |
| Deuteranopia (no green cones) | #1C3D70 | 0.017 |
| Tritanopia (no blue cones) | #004951 | 0.082 |
| Achromatopsia (no color) | #3F3F3F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3D71
#2B3D71
oklch(37.3% 0.092 267.5)
- #523D00
#523D00
oklch(37.3% 0.076 86.6)
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 #2B3D71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Marine Blue #01386A ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.053
- Prussian Blue #1D3557 ΔE 0.053
- Cobalt #1E488F ΔE 0.055
- Light Navy #155084 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.063
- Dark Blue Grey #1F3B4D ΔE 0.066
Use #2B3D71 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.