#2B3083
Closest named color: Twilight Blue (#0A437A). oklch(36% 0.137 274.5), rgb(43, 48, 131).
Aa
White text reads best on this color (11.33:1).
About this color
#2B3083 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.137 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.058 away. White text reads best on it, at 11.33:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.85:1 |
| White text | 11.33:1 |
Values
| HEX | #2B3083 |
| RGB | rgb(43, 48, 131) |
| HSL | hsl(237, 51%, 34%) |
| OKLCH | oklch(36% 0.137 274.5) |
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 #2B3083 | 11.33:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #2B3083 | 1.85:1 | Fails | Lc 8.2 | Not readable |
| #2B3083 text on white | 11.33:1 | AAA | Lc 95.7 | Preferred for body text |
| #2B3083 text on black | 1.85:1 | Fails | Lc 0.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8597FF
oklch(70.8% 0.153 274.4)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600
#5359F5
oklch(55.7% 0.228 274.5)
-
Step 700
700
#4447D5
oklch(49% 0.212 274.4)
-
Step 800
800
#383CAC
oklch(42.7% 0.175 274.6)
-
Step 900
900 (this color)
#2B3083
oklch(36% 0.137 274.5)
-
Step 950
950
#1B2050
oklch(27% 0.087 274.5)
#2B3083 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) | #003E86 | 0.045 |
| Deuteranopia (no green cones) | #003681 | 0.038 |
| Tritanopia (no blue cones) | #004554 | 0.114 |
| Achromatopsia (no color) | #3A3A3A | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3083
#2B3083
oklch(36% 0.137 274.5)
- #4A3C00
#4A3C00
oklch(36.1% 0.074 94.1)
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 #2B3083, closest first.
No curated palette has a color within ΔE 0.04 of #2B3083.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.058
- Marine Blue #01386A ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.062
- Cobalt #1E488F ΔE 0.064
- Sapphire #2138AB ΔE 0.069
- Royal #0C1793 ΔE 0.070
- Blueberry #464196 ΔE 0.071
- Midnight Blue #191970 ΔE 0.072
Use #2B3083 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.