#42427B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.8% 0.094 281.4), rgb(66, 66, 123).
Aa
White text reads best on this color (9.14:1).
About this color
#42427B is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.094 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.033 away. White text reads best on it, at 9.14:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.29:1 |
| White text | 9.14:1 |
Values
| HEX | #42427B |
| RGB | rgb(66, 66, 123) |
| HSL | hsl(240, 30%, 37%) |
| OKLCH | oklch(40.8% 0.094 281.4) |
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 #42427B | 9.14:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #42427B | 2.29:1 | Fails | Lc 13.0 | Not readable |
| #42427B text on white | 9.14:1 | AAA | Lc 90.9 | Preferred for body text |
| #42427B text on black | 2.29:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D5D7ED
oklch(88.4% 0.03 281.6)
-
Step 300
300
#BABDE4
oklch(80.9% 0.055 281.6)
-
Step 400
400
#979AD7
oklch(70.7% 0.089 281.7)
-
Step 500
500
#7E80CC
oklch(63% 0.113 281.5)
-
Step 600
600
#6869B8
oklch(55.6% 0.121 281.2)
-
Step 700
700
#57579F
oklch(49.2% 0.113 281.4)
-
Step 800
800 (this color)
#42427B
oklch(40.8% 0.094 281.4)
-
Step 900
900
#3B3C67
oklch(37.6% 0.073 281.3)
-
Step 950
950
#23233D
oklch(27% 0.048 282.7)
#42427B 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) | #2C4A7D | 0.034 |
| Deuteranopia (no green cones) | #29467A | 0.034 |
| Tritanopia (no blue cones) | #2F4E58 | 0.082 |
| Achromatopsia (no color) | #484848 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42427B
#42427B
oklch(40.8% 0.094 281.4)
- #544B00
#544B00
oklch(40.9% 0.085 101.5)
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 #42427B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.033
- Blueberry #464196 ΔE 0.046
- Twilight #4E518B ΔE 0.052
- Cobalt #1E488F ΔE 0.052
- Dusk #4E5481 ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Dusk Blue #26538D ΔE 0.057
- Twilight Blue #0A437A ΔE 0.059
Use #42427B 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.