#4243A0
Closest named color: Blueberry (#464196). oklch(43.7% 0.147 277.9), rgb(66, 67, 160).
Aa
White text reads best on this color (8.26:1).
About this color
#4243A0 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.147 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.017 away. White text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.54:1 |
| White text | 8.26:1 |
Values
| HEX | #4243A0 |
| RGB | rgb(66, 67, 160) |
| HSL | hsl(239, 42%, 44%) |
| OKLCH | oklch(43.7% 0.147 277.9) |
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 #4243A0 | 8.26:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #4243A0 | 2.54:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #4243A0 text on white | 8.26:1 | AAA | Lc 88.2 | Fine for body text |
| #4243A0 text on black | 2.54:1 | Fails | Lc -14.0 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B3BCF8
oklch(80.9% 0.085 277.7)
-
Step 400
400
#8D96F5
oklch(70.6% 0.138 278.1)
-
Step 500
500
#7379F1
oklch(63% 0.177 277.9)
-
Step 600
600
#5E5FDF
oklch(55.6% 0.19 277.9)
-
Step 700
700
#4E4DC2
oklch(49.1% 0.178 278)
-
Step 800
800 (this color)
#4243A0
oklch(43.7% 0.147 277.9)
-
Step 900
900
#35387D
oklch(37.8% 0.115 277.5)
-
Step 950
950
#1F2149
oklch(27% 0.073 278.2)
#4243A0 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) | #0052A3 | 0.059 |
| Deuteranopia (no green cones) | #004B9E | 0.056 |
| Tritanopia (no blue cones) | #04596B | 0.128 |
| Achromatopsia (no color) | #4E4E4E | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4243A0
#4243A0
oklch(43.7% 0.147 277.9)
- #5F5100
#5F5100
oklch(43.6% 0.09 97.6)
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 #4243A0, closest first.
No curated palette has a color within ΔE 0.04 of #4243A0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.017
- Dark Slate Blue #483D8B ΔE 0.037
- Cobalt #1E488F ΔE 0.052
- Sapphire #2138AB ΔE 0.056
- Twilight #4E518B ΔE 0.058
- Dusk Blue #26538D ΔE 0.062
- Blue With A Hint Of Purple #533CC6 ΔE 0.067
- Rebecca Purple #663399 ΔE 0.069
Use #4243A0 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.