#2A3C6A
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.083 266.3), rgb(42, 60, 106).
Aa
White text reads best on this color (10.75:1).
About this color
#2A3C6A is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.083 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.75:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #2A3C6A |
| RGB | rgb(42, 60, 106) |
| HSL | hsl(223, 43%, 29%) |
| OKLCH | oklch(36.5% 0.083 266.3) |
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 #2A3C6A | 10.75:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #2A3C6A | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #2A3C6A text on white | 10.75:1 | AAA | Lc 94.8 | Preferred for body text |
| #2A3C6A text on black | 1.95:1 | Fails | Lc -7.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#849FDF
oklch(70.7% 0.099 266.4)
-
Step 500
500
#6686D6
oklch(63.2% 0.126 266.4)
-
Step 600
600
#4D6EC4
oklch(55.6% 0.139 266.2)
-
Step 700
700
#3E5CA9
oklch(49.2% 0.128 265.9)
-
Step 800
800
#344B89
oklch(42.7% 0.107 266.6)
-
Step 900
900 (this color)
#2A3C6A
oklch(36.5% 0.083 266.3)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#2A3C6A 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) | #28416C | 0.015 |
| Deuteranopia (no green cones) | #203B69 | 0.013 |
| Tritanopia (no blue cones) | #00464D | 0.075 |
| Achromatopsia (no color) | #3E3E3E | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3C6A
#2A3C6A
oklch(36.5% 0.083 266.3)
- #503B00
#503B00
oklch(36.6% 0.075 86)
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 #2A3C6A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.054
- Charcoal #264653 ΔE 0.058
- Marine #042E60 ΔE 0.063
- Midnight Green #073B4C ΔE 0.065
Use #2A3C6A 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.