#42356B
Closest named color: Dark Slate Blue (#483D8B). oklch(37.1% 0.091 292.5), rgb(66, 53, 107).
Aa
White text reads best on this color (10.75:1).
About this color
#42356B is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.091 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.057 away. White text reads best on it, at 10.75:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.091) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #42356B |
| RGB | rgb(66, 53, 107) |
| HSL | hsl(254, 34%, 31%) |
| OKLCH | oklch(37.1% 0.091 292.5) |
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 #42356B | 10.75:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #42356B | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #42356B text on white | 10.75:1 | AAA | Lc 94.8 | Preferred for body text |
| #42356B text on black | 1.95:1 | 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
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#D9D5F1
oklch(88.5% 0.038 292.2)
-
Step 300
300
#C1B9E9
oklch(80.8% 0.068 292.5)
-
Step 400
400
#A294DF
oklch(70.8% 0.109 291.9)
-
Step 500
500
#8D77D5
oklch(63% 0.139 292.7)
-
Step 600
600
#785EC3
oklch(55.6% 0.152 292.6)
-
Step 700
700
#654DA8
oklch(49.1% 0.14 292.6)
-
Step 800
800
#524088
oklch(42.7% 0.116 292.3)
-
Step 900
900 (this color)
#42356B
oklch(37.1% 0.091 292.5)
-
Step 950
950
#272040
oklch(26.9% 0.058 292.1)
#42356B 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) | #223E6D | 0.050 |
| Deuteranopia (no green cones) | #233D6A | 0.049 |
| Tritanopia (no blue cones) | #38404B | 0.074 |
| Achromatopsia (no color) | #3E3E3E | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42356B
#42356B
oklch(37.1% 0.091 292.5)
- #414400
#414400
oklch(37.1% 0.083 112.6)
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 #42356B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.068
- Twilight Blue #0A437A ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.072
- Marine Blue #01386A ΔE 0.074
- Blueberry #464196 ΔE 0.076
- Dark Blue Grey #1F3B4D ΔE 0.080
- Cobalt #1E488F ΔE 0.082
Use #42356B 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.