#2B397F
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.119 271), rgb(43, 57, 127).
Aa
White text reads best on this color (10.52:1).
About this color
#2B397F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.119 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 10.52:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.52:1 |
Values
| HEX | #2B397F |
| RGB | rgb(43, 57, 127) |
| HSL | hsl(230, 49%, 33%) |
| OKLCH | oklch(37.5% 0.119 271) |
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 #2B397F | 10.52:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #2B397F | 1.99:1 | Fails | Lc 9.8 | Not readable |
| #2B397F text on white | 10.52:1 | AAA | Lc 94.1 | Preferred for body text |
| #2B397F text on black | 1.99:1 | Fails | Lc -8.4 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ABBEFB
oklch(80.9% 0.089 270.9)
-
Step 400
400
#809AF9
oklch(70.7% 0.142 270.8)
-
Step 500
500
#637DF6
oklch(63.1% 0.182 271.2)
-
Step 600
600
#4C62E5
oklch(55.5% 0.199 271.2)
-
Step 700
700
#3E50C7
oklch(49% 0.185 271.3)
-
Step 800
800
#3343A1
oklch(42.8% 0.152 271.1)
-
Step 900
900 (this color)
#2B397F
oklch(37.5% 0.119 271)
-
Step 950
950
#19224B
oklch(26.9% 0.077 271.1)
#2B397F 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) | #0B4381 | 0.035 |
| Deuteranopia (no green cones) | #003B7E | 0.034 |
| Tritanopia (no blue cones) | #004956 | 0.099 |
| Achromatopsia (no color) | #3F3F3F | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B397F
#2B397F
oklch(37.5% 0.119 271)
- #503F00
#503F00
oklch(37.5% 0.077 91.5)
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 #2B397F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.038
- Cobalt #1E488F ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.051
- Marine Blue #01386A ΔE 0.053
- Blueberry #464196 ΔE 0.061
- Light Navy #155084 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.073
- Sapphire #2138AB ΔE 0.073
Use #2B397F 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.