#2B3979
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.11 270.9), rgb(43, 57, 121).
Aa
White text reads best on this color (10.69:1).
About this color
#2B3979 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.110 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.036 away. White text reads best on it, at 10.69:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.69:1 |
Values
| HEX | #2B3979 |
| RGB | rgb(43, 57, 121) |
| HSL | hsl(229, 48%, 32%) |
| OKLCH | oklch(37% 0.11 270.9) |
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 #2B3979 | 10.69:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #2B3979 | 1.96:1 | Fails | Lc 9.4 | Not readable |
| #2B3979 text on white | 10.69:1 | AAA | Lc 94.5 | Preferred for body text |
| #2B3979 text on black | 1.96:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ACBEF7
oklch(80.8% 0.083 270.9)
-
Step 400
400
#829BF3
oklch(70.7% 0.132 270.7)
-
Step 500
500
#657FEE
oklch(63.1% 0.168 271)
-
Step 600
600
#4E65DD
oklch(55.6% 0.184 271)
-
Step 700
700
#3F53C0
oklch(49.1% 0.172 270.9)
-
Step 800
800
#34459B
oklch(42.7% 0.141 270.8)
-
Step 900
900 (this color)
#2B3979
oklch(37% 0.11 270.9)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#2B3979 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) | #15427B | 0.030 |
| Deuteranopia (no green cones) | #023B78 | 0.034 |
| Tritanopia (no blue cones) | #004853 | 0.094 |
| Achromatopsia (no color) | #3E3E3E | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3979
#2B3979
oklch(37% 0.11 270.9)
- #4F3D00
#4F3D00
oklch(36.9% 0.075 89.9)
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 #2B3979, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Marine Blue #01386A ΔE 0.046
- Cobalt #1E488F ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.063
- Light Navy #155084 ΔE 0.066
- Blueberry #464196 ΔE 0.068
- Marine #042E60 ΔE 0.069
Use #2B3979 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.