#2A428B
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.125 267), rgb(42, 66, 139).
Aa
White text reads best on this color (9.33:1).
About this color
#2A428B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.125 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.019 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.25:1 |
| White text | 9.33:1 |
Values
| HEX | #2A428B |
| RGB | rgb(42, 66, 139) |
| HSL | hsl(225, 54%, 35%) |
| OKLCH | oklch(40.3% 0.125 267) |
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 #2A428B | 9.33:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #2A428B | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #2A428B text on white | 9.33:1 | AAA | Lc 91.2 | Preferred for body text |
| #2A428B text on black | 2.25:1 | Fails | Lc -11.1 | 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 800.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F1
oklch(80.9% 0.073 266.7)
-
Step 400
400
#809EEA
oklch(70.8% 0.117 267)
-
Step 500
500
#6184E3
oklch(63.2% 0.148 266.9)
-
Step 600
600
#486BD1
oklch(55.6% 0.162 266.8)
-
Step 700
700
#3A59B5
oklch(49.2% 0.15 266.8)
-
Step 800
800 (this color)
#2A428B
oklch(40.3% 0.125 267)
-
Step 900
900
#2A3E75
oklch(37.8% 0.097 266.7)
-
Step 950
950
#192544
oklch(27.1% 0.06 266.5)
#2A428B 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) | #164B8E | 0.027 |
| Deuteranopia (no green cones) | #00438A | 0.029 |
| Tritanopia (no blue cones) | #005360 | 0.101 |
| Achromatopsia (no color) | #474747 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A428B
#2A428B
oklch(40.3% 0.125 267)
- #5C4500
#5C4500
oklch(40.4% 0.083 86.9)
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 #2A428B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.019
- Twilight Blue #0A437A ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.043
- Light Navy #155084 ΔE 0.044
- Dusk Blue #26538D ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.059
- Sapphire #2138AB ΔE 0.060
Use #2A428B 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.