#2C3A71
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.096 270.4), rgb(44, 58, 113).
Aa
White text reads best on this color (10.76:1).
About this color
#2C3A71 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.096 and its hue 270°. 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 10.76:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #2C3A71 |
| RGB | rgb(44, 58, 113) |
| HSL | hsl(228, 44%, 31%) |
| OKLCH | oklch(36.7% 0.096 270.4) |
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 #2C3A71 | 10.76:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #2C3A71 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #2C3A71 text on white | 10.76:1 | AAA | Lc 94.8 | Preferred for body text |
| #2C3A71 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CFD8F4
oklch(88.4% 0.04 271.4)
-
Step 300
300
#AFBFF0
oklch(80.9% 0.072 270.6)
-
Step 400
400
#859CE9
oklch(70.6% 0.116 270.6)
-
Step 500
500
#6882E2
oklch(63.1% 0.147 270.3)
-
Step 600
600
#5169D0
oklch(55.6% 0.161 270.5)
-
Step 700
700
#4257B4
oklch(49.1% 0.149 270.5)
-
Step 800
800
#364892
oklch(42.8% 0.123 270.2)
-
Step 900
900 (this color)
#2C3A71
oklch(36.7% 0.096 270.4)
-
Step 950
950
#1B2444
oklch(27% 0.061 270.1)
#2C3A71 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) | #204173 | 0.023 |
| Deuteranopia (no green cones) | #163B70 | 0.024 |
| Tritanopia (no blue cones) | #004650 | 0.084 |
| Achromatopsia (no color) | #3E3E3E | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2C3A71
#2C3A71
oklch(36.7% 0.096 270.4)
- #4E3D00
#4E3D00
oklch(36.8% 0.075 91)
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 #2C3A71, 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 0.042
- Prussian Blue #1D3557 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.063
- Marine #042E60 ΔE 0.065
- Light Navy #155084 ΔE 0.067
Use #2C3A71 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.