#423DA3
Closest named color: Blueberry (#464196). oklch(42.8% 0.159 279.5), rgb(66, 61, 163).
Aa
White text reads best on this color (8.64:1).
About this color
#423DA3 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.159 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.025 away. White text reads best on it, at 8.64:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.42:1 |
| White text | 8.64:1 |
Values
| HEX | #423DA3 |
| RGB | rgb(66, 61, 163) |
| HSL | hsl(243, 46%, 44%) |
| OKLCH | oklch(42.8% 0.159 279.5) |
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 #423DA3 | 8.64:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #423DA3 | 2.42:1 | Fails | Lc 14.7 | Not readable |
| #423DA3 text on white | 8.64:1 | AAA | Lc 89.2 | Fine for body text |
| #423DA3 text on black | 2.42:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D1D6FC
oklch(88.4% 0.053 279.4)
-
Step 300
300
#B4BBFC
oklch(81% 0.092 279.4)
-
Step 400
400
#8F94FB
oklch(70.7% 0.149 279.8)
-
Step 500
500
#7676F8
oklch(63.2% 0.189 279.5)
-
Step 600
600
#615AE7
oklch(55.6% 0.206 279.5)
-
Step 700
700
#5148C9
oklch(49% 0.193 279.7)
-
Step 800
800 (this color)
#423DA3
oklch(42.8% 0.159 279.5)
-
Step 900
900
#373581
oklch(37.7% 0.124 279.8)
-
Step 950
950
#20204B
oklch(27% 0.078 279.9)
#423DA3 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) | #0050A6 | 0.065 |
| Deuteranopia (no green cones) | #0048A1 | 0.059 |
| Tritanopia (no blue cones) | #00566A | 0.137 |
| Achromatopsia (no color) | #4C4C4C | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423DA3
#423DA3
oklch(42.8% 0.159 279.5)
- #5B5000
#5B5000
oklch(42.9% 0.089 100.2)
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 #423DA3, closest first.
No curated palette has a color within ΔE 0.04 of #423DA3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.025
- Dark Slate Blue #483D8B ΔE 0.041
- Sapphire #2138AB ΔE 0.048
- Cobalt #1E488F ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.062
- Rebecca Purple #663399 ΔE 0.067
- Blue Blue #2242C7 ΔE 0.068
Use #423DA3 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.