#2A4178
Closest named color: Twilight Blue (#0A437A). oklch(38.7% 0.098 265.1), rgb(42, 65, 120).
Aa
White text reads best on this color (9.87:1).
About this color
#2A4178 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.098 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.025 away. White text reads best on it, at 9.87:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.87:1 |
Values
| HEX | #2A4178 |
| RGB | rgb(42, 65, 120) |
| HSL | hsl(222, 48%, 32%) |
| OKLCH | oklch(38.7% 0.098 265.1) |
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 #2A4178 | 9.87:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #2A4178 | 2.12:1 | Fails | Lc 11.2 | Not readable |
| #2A4178 text on white | 9.87:1 | AAA | Lc 92.7 | Preferred for body text |
| #2A4178 text on black | 2.12:1 | Fails | Lc -9.7 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC0F1
oklch(80.8% 0.074 265.9)
-
Step 400
400
#7D9FEA
oklch(70.8% 0.117 265)
-
Step 500
500
#5C85E4
oklch(63.2% 0.15 264.9)
-
Step 600
600
#436CD2
oklch(55.6% 0.164 265)
-
Step 700
700
#355AB6
oklch(49.2% 0.152 264.9)
-
Step 800
800
#2C4A93
oklch(42.8% 0.125 264.8)
-
Step 900
900 (this color)
#2A4178
oklch(38.7% 0.098 265.1)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#2A4178 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) | #27477A | 0.017 |
| Deuteranopia (no green cones) | #1B4077 | 0.017 |
| Tritanopia (no blue cones) | #004D56 | 0.083 |
| Achromatopsia (no color) | #434343 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4178
#2A4178
oklch(38.7% 0.098 265.1)
- #574000
#574000
oklch(38.6% 0.079 85.4)
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 #2A4178, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Cobalt #1E488F ΔE 0.041
- Light Navy #155084 ΔE 0.045
- Marine Blue #01386A ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.057
- Dusk Blue #26538D ΔE 0.058
Use #2A4178 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.