#2A3380
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.129 273.1), rgb(42, 51, 128).
Aa
White text reads best on this color (11.14:1).
About this color
#2A3380 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.129 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.050 away. White text reads best on it, at 11.14:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.88:1 |
| White text | 11.14:1 |
Values
| HEX | #2A3380 |
| RGB | rgb(42, 51, 128) |
| HSL | hsl(234, 51%, 33%) |
| OKLCH | oklch(36.2% 0.129 273.1) |
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 #2A3380 | 11.14:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #2A3380 | 1.88:1 | Fails | Lc 8.5 | Not readable |
| #2A3380 text on white | 11.14:1 | AAA | Lc 95.4 | Preferred for body text |
| #2A3380 text on black | 1.88:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD8FE
oklch(88.6% 0.054 272.5)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8297FF
oklch(70.6% 0.154 273.2)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600
#505DEE
oklch(55.6% 0.215 273.2)
-
Step 700
700
#414BCF
oklch(49% 0.201 273)
-
Step 800
800
#353FA7
oklch(42.6% 0.165 272.9)
-
Step 900
900 (this color)
#2A3380
oklch(36.2% 0.129 273.1)
-
Step 950
950
#1A214E
oklch(27% 0.083 273)
#2A3380 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) | #003F83 | 0.041 |
| Deuteranopia (no green cones) | #00387E | 0.035 |
| Tritanopia (no blue cones) | #004654 | 0.108 |
| Achromatopsia (no color) | #3B3B3B | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3380
#2A3380
oklch(36.2% 0.129 273.1)
- #4B3C00
#4B3C00
oklch(36.2% 0.074 93)
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 #2A3380, closest first.
No curated palette has a color within ΔE 0.04 of #2A3380.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.050
- Marine Blue #01386A ΔE 0.055
- Cobalt #1E488F ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
- Blueberry #464196 ΔE 0.069
- Marine #042E60 ΔE 0.071
- Sapphire #2138AB ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.075
Use #2A3380 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.