#4243A1
Closest named color: Blueberry (#464196). oklch(43.8% 0.149 277.9), rgb(66, 67, 161).
Aa
White text reads best on this color (8.23:1).
About this color
#4243A1 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.149 and its hue 278°. 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 8.23:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.54:1 |
| White text | 8.23:1 |
Values
| HEX | #4243A1 |
| RGB | rgb(66, 67, 161) |
| HSL | hsl(239, 42%, 45%) |
| OKLCH | oklch(43.8% 0.149 277.9) |
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 #4243A1 | 8.23:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #4243A1 | 2.54:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #4243A1 text on white | 8.23:1 | AAA | Lc 88.1 | Fine for body text |
| #4243A1 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
#D1D7FA
oklch(88.6% 0.049 277.7)
-
Step 300
300
#B3BCF9
oklch(81% 0.087 277.8)
-
Step 400
400
#8D96F6
oklch(70.7% 0.14 278.1)
-
Step 500
500
#7379F2
oklch(63.1% 0.178 277.9)
-
Step 600
600
#5E5EE0
oklch(55.5% 0.193 278.1)
-
Step 700
700
#4E4DC3
oklch(49.2% 0.179 277.9)
-
Step 800
800 (this color)
#4243A1
oklch(43.8% 0.149 277.9)
-
Step 900
900
#35377D
oklch(37.6% 0.116 278)
-
Step 950
950
#1F2149
oklch(27% 0.073 278.2)
#4243A1 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) | #0053A4 | 0.060 |
| Deuteranopia (no green cones) | #004B9F | 0.056 |
| Tritanopia (no blue cones) | #01596B | 0.129 |
| Achromatopsia (no color) | #4F4F4F | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4243A1
#4243A1
oklch(43.8% 0.149 277.9)
- #5F5200
#5F5200
oklch(43.8% 0.091 98.6)
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 #4243A1, closest first.
No curated palette has a color within ΔE 0.04 of #4243A1.
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 0.038
- Cobalt #1E488F ΔE 0.053
- Sapphire #2138AB ΔE 0.055
- Twilight #4E518B ΔE 0.059
- Dusk Blue #26538D ΔE 0.063
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.068
Use #4243A1 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.