#42307A
Closest named color: Dark Slate Blue (#483D8B). oklch(37.2% 0.121 290.5), rgb(66, 48, 122).
Aa
White text reads best on this color (10.85:1).
About this color
#42307A is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.121 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.044 away. White text reads best on it, at 10.85:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.93:1 |
| White text | 10.85:1 |
Values
| HEX | #42307A |
| RGB | rgb(66, 48, 122) |
| HSL | hsl(255, 44%, 33%) |
| OKLCH | oklch(37.2% 0.121 290.5) |
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 #42307A | 10.85:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #42307A | 1.93:1 | Fails | Lc 9.1 | Not readable |
| #42307A text on white | 10.85:1 | AAA | Lc 94.8 | Preferred for body text |
| #42307A text on black | 1.93:1 | Fails | Lc -7.8 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E7FB
oklch(93.5% 0.027 290.5)
-
Step 200
200
#D8D4F9
oklch(88.5% 0.051 290.3)
-
Step 300
300
#C0B7F7
oklch(80.9% 0.09 290.7)
-
Step 400
400
#A18FF3
oklch(70.7% 0.144 290.5)
-
Step 500
500
#8C6FEF
oklch(63.1% 0.185 290.5)
-
Step 600
600
#7853DD
oklch(55.6% 0.2 290.8)
-
Step 700
700
#6542C0
oklch(49.1% 0.187 290.6)
-
Step 800
800
#52389B
oklch(42.7% 0.154 290.5)
-
Step 900
900 (this color)
#42307A
oklch(37.2% 0.121 290.5)
-
Step 950
950
#271E48
oklch(27% 0.075 290.3)
#42307A 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) | #003E7C | 0.074 |
| Deuteranopia (no green cones) | #043B78 | 0.072 |
| Tritanopia (no blue cones) | #324050 | 0.097 |
| Achromatopsia (no color) | #3D3D3D | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42307A
#42307A
oklch(37.2% 0.121 290.5)
- #434400
#434400
oklch(37.3% 0.082 110.7)
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 #42307A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.044
- Blueberry #464196 ΔE 0.062
- Indigo #4B0082 ΔE 0.073
- Twilight Blue #0A437A ΔE 0.076
- Cobalt #1E488F ΔE 0.077
- Royal Purple #4B006E ΔE 0.081
- Marine Blue #01386A ΔE 0.082
- Rebecca Purple #663399 ΔE 0.085
Use #42307A 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.