#2A428F
Closest named color: Cobalt (#1E488F). oklch(40.6% 0.131 267.3), rgb(42, 66, 143).
Aa
White text reads best on this color (9.23:1).
About this color
#2A428F is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.131 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.018 away. White text reads best on it, at 9.23:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.23:1 |
Values
| HEX | #2A428F |
| RGB | rgb(42, 66, 143) |
| HSL | hsl(226, 55%, 36%) |
| OKLCH | oklch(40.6% 0.131 267.3) |
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 #2A428F | 9.23:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #2A428F | 2.27:1 | Fails | Lc 13.0 | Not readable |
| #2A428F text on white | 9.23:1 | AAA | Lc 90.9 | Preferred for body text |
| #2A428F text on black | 2.27:1 | Fails | Lc -11.4 | 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
#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
#ABC0F3
oklch(81% 0.076 267.3)
-
Step 400
400
#7F9DED
oklch(70.7% 0.122 267.6)
-
Step 500
500
#5F83E7
oklch(63.1% 0.156 267)
-
Step 600
600
#476AD5
oklch(55.6% 0.169 267.1)
-
Step 700
700
#3957B9
oklch(49% 0.159 267.4)
-
Step 800
800 (this color)
#2A428F
oklch(40.6% 0.131 267.3)
-
Step 900
900
#293D77
oklch(37.6% 0.102 267.1)
-
Step 950
950
#182446
oklch(26.9% 0.065 267.3)
#2A428F 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) | #0F4C92 | 0.031 |
| Deuteranopia (no green cones) | #00438D | 0.029 |
| Tritanopia (no blue cones) | #005462 | 0.105 |
| Achromatopsia (no color) | #474747 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A428F
#2A428F
oklch(40.6% 0.131 267.3)
- #5C4600
#5C4600
oklch(40.6% 0.083 88.1)
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 #2A428F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.018
- Blueberry #464196 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Light Navy #155084 ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Sapphire #2138AB ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.061
Use #2A428F 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.