#2B387B
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.114 271.4), rgb(43, 56, 123).
Aa
White text reads best on this color (10.74:1).
About this color
#2B387B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.114 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.038 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #2B387B |
| RGB | rgb(43, 56, 123) |
| HSL | hsl(230, 48%, 33%) |
| OKLCH | oklch(36.9% 0.114 271.4) |
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 #2B387B | 10.74:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #2B387B | 1.95:1 | Fails | Lc 9.3 | Not readable |
| #2B387B text on white | 10.74:1 | AAA | Lc 94.6 | Preferred for body text |
| #2B387B text on black | 1.95:1 | Fails | Lc -8.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ACBEF9
oklch(80.9% 0.086 271.2)
-
Step 400
400
#829AF6
oklch(70.7% 0.137 271.4)
-
Step 500
500
#657EF2
oklch(63.2% 0.175 271.4)
-
Step 600
600
#4E64E1
oklch(55.7% 0.191 271.3)
-
Step 700
700
#4052C3
oklch(49.2% 0.177 271.5)
-
Step 800
800
#34449E
oklch(42.8% 0.147 271.2)
-
Step 900
900 (this color)
#2B387B
oklch(36.9% 0.114 271.4)
-
Step 950
950
#1A2349
oklch(27.1% 0.071 270.9)
#2B387B 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) | #0F417D | 0.032 |
| Deuteranopia (no green cones) | #003A7A | 0.035 |
| Tritanopia (no blue cones) | #004854 | 0.097 |
| Achromatopsia (no color) | #3E3E3E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B387B
#2B387B
oklch(36.9% 0.114 271.4)
- #4E3E00
#4E3E00
oklch(37% 0.076 92.3)
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 #2B387B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.038
- Marine Blue #01386A ΔE 0.048
- Cobalt #1E488F ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.066
- Blueberry #464196 ΔE 0.066
- Light Navy #155084 ΔE 0.068
- Marine #042E60 ΔE 0.070
Use #2B387B 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.