#2C3A78
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.107 270.8), rgb(44, 58, 120).
Aa
White text reads best on this color (10.58:1).
About this color
#2C3A78 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.107 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.58:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.58:1 |
Values
| HEX | #2C3A78 |
| RGB | rgb(44, 58, 120) |
| HSL | hsl(229, 46%, 32%) |
| OKLCH | oklch(37.2% 0.107 270.8) |
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 #2C3A78 | 10.58:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #2C3A78 | 1.98:1 | Fails | Lc 9.6 | Not readable |
| #2C3A78 text on white | 10.58:1 | AAA | Lc 94.3 | Preferred for body text |
| #2C3A78 text on black | 1.98:1 | Fails | Lc -8.3 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F7
oklch(88.4% 0.044 271.3)
-
Step 300
300
#ADBEF5
oklch(80.8% 0.08 271.2)
-
Step 400
400
#839BF0
oklch(70.7% 0.128 270.9)
-
Step 500
500
#6680EB
oklch(63.2% 0.163 270.8)
-
Step 600
600
#4F66DA
oklch(55.6% 0.179 271)
-
Step 700
700
#4054BD
oklch(49.1% 0.166 270.9)
-
Step 800
800
#354699
oklch(42.8% 0.137 270.9)
-
Step 900
900 (this color)
#2C3A78
oklch(37.2% 0.107 270.8)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#2C3A78 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) | #19427A | 0.027 |
| Deuteranopia (no green cones) | #093B77 | 0.032 |
| Tritanopia (no blue cones) | #004853 | 0.092 |
| Achromatopsia (no color) | #3F3F3F | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2C3A78
#2C3A78
oklch(37.2% 0.107 270.8)
- #4F3E00
#4F3E00
oklch(37.1% 0.076 91.2)
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 #2C3A78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Marine Blue #01386A ΔE 0.047
- Cobalt #1E488F ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.062
- Light Navy #155084 ΔE 0.064
- Blueberry #464196 ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.068
Use #2C3A78 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.