#2B3B73
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.098 269.2), rgb(43, 59, 115).
Aa
White text reads best on this color (10.62:1).
About this color
#2B3B73 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.098 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.033 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #2B3B73 |
| RGB | rgb(43, 59, 115) |
| HSL | hsl(227, 46%, 31%) |
| OKLCH | oklch(37% 0.098 269.2) |
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 #2B3B73 | 10.62:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #2B3B73 | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #2B3B73 text on white | 10.62:1 | AAA | Lc 94.4 | Preferred for body text |
| #2B3B73 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#ADBFF1
oklch(80.8% 0.074 269.3)
-
Step 400
400
#839DEA
oklch(70.8% 0.117 269.1)
-
Step 500
500
#6582E4
oklch(63.1% 0.151 269.3)
-
Step 600
600
#4D69D2
oklch(55.5% 0.164 269.2)
-
Step 700
700
#3F57B6
oklch(49.1% 0.153 269.4)
-
Step 800
800
#344893
oklch(42.8% 0.125 269.3)
-
Step 900
900 (this color)
#2B3B73
oklch(37% 0.098 269.2)
-
Step 950
950
#1A2445
oklch(27% 0.063 269.2)
#2B3B73 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) | #204275 | 0.022 |
| Deuteranopia (no green cones) | #153B72 | 0.024 |
| Tritanopia (no blue cones) | #004851 | 0.086 |
| Achromatopsia (no color) | #3E3E3E | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3B73
#2B3B73
oklch(37% 0.098 269.2)
- #503D00
#503D00
oklch(37% 0.076 88.8)
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 #2B3B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.033
- Marine Blue #01386A ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.055
- Cobalt #1E488F ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.061
- Light Navy #155084 ΔE 0.063
- Marine #042E60 ΔE 0.067
Use #2B3B73 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.