#42298E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.157 287.8), rgb(66, 41, 142).
Aa
White text reads best on this color (10.82:1).
About this color
#42298E is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.157 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.049 away. White text reads best on it, at 10.82:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.93:1 |
| White text | 10.82:1 |
Values
| HEX | #42298E |
| RGB | rgb(66, 41, 142) |
| HSL | hsl(255, 55%, 36%) |
| OKLCH | oklch(37.7% 0.157 287.8) |
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 #42298E | 10.82:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #42298E | 1.93:1 | Fails | Lc 9.5 | Not readable |
| #42298E text on white | 10.82:1 | AAA | Lc 94.5 | Preferred for body text |
| #42298E text on black | 1.93:1 | Fails | Lc -8.1 | 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 900.
-
Step 50
50
#F5F4FF
oklch(97.1% 0.015 290.3)
-
Step 100
100
#E8E7FF
oklch(93.6% 0.032 287.7)
-
Step 200
200
#D6D4FF
oklch(88.5% 0.059 287.3)
-
Step 300
300
#BDB7FF
oklch(81% 0.101 287.7)
-
Step 400
400
#9D8DFF
oklch(70.7% 0.163 287.9)
-
Step 500
500
#886BFF
oklch(63.2% 0.21 287.8)
-
Step 600
600
#763EFF
oklch(55.6% 0.262 287.8)
-
Step 700
700
#642DDF
oklch(49.2% 0.244 287.7)
-
Step 800
800
#5129B4
oklch(42.8% 0.201 287.7)
-
Step 900
900 (this color)
#42298E
oklch(37.7% 0.157 287.8)
-
Step 950
950
#261A53
oklch(27% 0.099 287.6)
#42298E 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) | #004091 | 0.079 |
| Deuteranopia (no green cones) | #003A8C | 0.075 |
| Tritanopia (no blue cones) | #254358 | 0.128 |
| Achromatopsia (no color) | #3D3D3D | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42298E
#42298E
oklch(37.7% 0.157 287.8)
- #464400
#464400
oklch(37.6% 0.081 107.8)
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 #42298E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.049
- Imperial Purple #480CA8 ΔE 0.053
- Blueberry #464196 ΔE 0.058
- Indigo #4B0082 ΔE 0.060
- Indigo Blue #3A18B1 ΔE 0.064
- Chrysanthemum #560BAD ΔE 0.066
- Sapphire #2138AB ΔE 0.072
- Rebecca Purple #663399 ΔE 0.076
Use #42298E 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.