#2A3A75
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.103 269.4), rgb(42, 58, 117).
Aa
White text reads best on this color (10.71:1).
About this color
#2A3A75 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.103 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.033 away. White text reads best on it, at 10.71:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.71:1 |
Values
| HEX | #2A3A75 |
| RGB | rgb(42, 58, 117) |
| HSL | hsl(227, 47%, 31%) |
| OKLCH | oklch(36.9% 0.103 269.4) |
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 #2A3A75 | 10.71:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #2A3A75 | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #2A3A75 text on white | 10.71:1 | AAA | Lc 94.6 | Preferred for body text |
| #2A3A75 text on black | 1.96:1 | Fails | Lc -8.0 | 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
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F6
oklch(88.6% 0.042 269)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#829CEE
oklch(70.7% 0.124 269.7)
-
Step 500
500
#6481E8
oklch(63.1% 0.158 269.6)
-
Step 600
600
#4C68D6
oklch(55.5% 0.171 269.4)
-
Step 700
700
#3E56BA
oklch(49.1% 0.16 269.5)
-
Step 800
800
#334796
oklch(42.7% 0.132 269.4)
-
Step 900
900 (this color)
#2A3A75
oklch(36.9% 0.103 269.4)
-
Step 950
950
#1A2446
oklch(27.1% 0.065 269.4)
#2A3A75 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) | #1C4177 | 0.023 |
| Deuteranopia (no green cones) | #0E3B74 | 0.027 |
| Tritanopia (no blue cones) | #004752 | 0.087 |
| Achromatopsia (no color) | #3E3E3E | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3A75
#2A3A75
oklch(36.9% 0.103 269.4)
- #4F3D00
#4F3D00
oklch(36.9% 0.075 89.9)
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 #2A3A75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.033
- Marine Blue #01386A ΔE 0.042
- Cobalt #1E488F ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.064
- Light Navy #155084 ΔE 0.065
- Marine #042E60 ΔE 0.066
Use #2A3A75 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.