#423FA0
Closest named color: Blueberry (#464196). oklch(42.9% 0.153 279.2), rgb(66, 63, 160).
Aa
White text reads best on this color (8.57:1).
About this color
#423FA0 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.153 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.019 away. White text reads best on it, at 8.57:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.45:1 |
| White text | 8.57:1 |
Values
| HEX | #423FA0 |
| RGB | rgb(66, 63, 160) |
| HSL | hsl(242, 43%, 44%) |
| OKLCH | oklch(42.9% 0.153 279.2) |
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 #423FA0 | 8.57:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #423FA0 | 2.45:1 | Fails | Lc 14.9 | Not readable |
| #423FA0 text on white | 8.57:1 | AAA | Lc 89.1 | Fine for body text |
| #423FA0 text on black | 2.45:1 | Fails | Lc -13.1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B4BBFA
oklch(80.9% 0.089 279.3)
-
Step 400
400
#8F95F7
oklch(70.7% 0.142 279.4)
-
Step 500
500
#7677F4
oklch(63.1% 0.183 279.4)
-
Step 600
600
#605CE3
oklch(55.6% 0.199 279)
-
Step 700
700
#504BC5
oklch(49.1% 0.184 279)
-
Step 800
800 (this color)
#423FA0
oklch(42.9% 0.153 279.2)
-
Step 900
900
#37367E
oklch(37.6% 0.119 279.7)
-
Step 950
950
#20214A
oklch(27.1% 0.074 279.2)
#423FA0 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) | #0050A3 | 0.062 |
| Deuteranopia (no green cones) | #00489E | 0.058 |
| Tritanopia (no blue cones) | #065669 | 0.131 |
| Achromatopsia (no color) | #4C4C4C | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423FA0
#423FA0
oklch(42.9% 0.153 279.2)
- #5C5000
#5C5000
oklch(43% 0.089 99.3)
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 #423FA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.019
- Dark Slate Blue #483D8B ΔE 0.036
- Sapphire #2138AB ΔE 0.051
- Cobalt #1E488F ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
- Twilight #4E518B ΔE 0.066
- Rebecca Purple #663399 ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.067
Use #423FA0 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.