#2A3C77
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.103 268.3), rgb(42, 60, 119).
Aa
White text reads best on this color (10.44:1).
About this color
#2A3C77 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.103 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.44:1 |
Values
| HEX | #2A3C77 |
| RGB | rgb(42, 60, 119) |
| HSL | hsl(226, 48%, 32%) |
| OKLCH | oklch(37.4% 0.103 268.3) |
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 #2A3C77 | 10.44:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #2A3C77 | 2.01:1 | Fails | Lc 9.9 | Not readable |
| #2A3C77 text on white | 10.44:1 | AAA | Lc 94.0 | Preferred for body text |
| #2A3C77 text on black | 2.01:1 | Fails | Lc -8.5 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ABBFF4
oklch(80.8% 0.078 268.5)
-
Step 400
400
#809DEE
oklch(70.8% 0.123 268.2)
-
Step 500
500
#6182E8
oklch(63.1% 0.158 268.2)
-
Step 600
600
#4A69D6
oklch(55.6% 0.171 268.4)
-
Step 700
700
#3B57BA
oklch(49.2% 0.159 268.1)
-
Step 800
800
#314796
oklch(42.6% 0.132 268.5)
-
Step 900
900 (this color)
#2A3C77
oklch(37.4% 0.103 268.3)
-
Step 950
950
#192446
oklch(27% 0.065 268.3)
#2A3C77 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) | #1E4379 | 0.022 |
| Deuteranopia (no green cones) | #103C76 | 0.025 |
| Tritanopia (no blue cones) | #004953 | 0.088 |
| Achromatopsia (no color) | #404040 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3C77
#2A3C77
oklch(37.4% 0.103 268.3)
- #523E00
#523E00
oklch(37.5% 0.077 88)
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 #2A3C77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Marine Blue #01386A ΔE 0.045
- Cobalt #1E488F ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.057
- Light Navy #155084 ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.063
- Blueberry #464196 ΔE 0.068
Use #2A3C77 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.