#423371
Closest named color: Dark Slate Blue (#483D8B). oklch(37.1% 0.103 291.7), rgb(66, 51, 113).
Aa
White text reads best on this color (10.80:1).
About this color
#423371 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.103 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.050 away. White text reads best on it, at 10.80:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.103) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #423371 |
| RGB | rgb(66, 51, 113) |
| HSL | hsl(255, 38%, 32%) |
| OKLCH | oklch(37.1% 0.103 291.7) |
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 #423371 | 10.80:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #423371 | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #423371 text on white | 10.80:1 | AAA | Lc 94.8 | Preferred for body text |
| #423371 text on black | 1.94:1 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE8F8
oklch(93.7% 0.022 291.7)
-
Step 200
200
#D9D5F4
oklch(88.6% 0.042 291.4)
-
Step 300
300
#C1B8EF
oklch(80.9% 0.077 292.1)
-
Step 400
400
#A292E7
oklch(70.8% 0.123 291.6)
-
Step 500
500
#8D74E0
oklch(63.1% 0.158 291.9)
-
Step 600
600
#785ACE
oklch(55.7% 0.172 291.8)
-
Step 700
700
#6549B2
oklch(49.1% 0.16 291.7)
-
Step 800
800
#523D90
oklch(42.7% 0.132 291.5)
-
Step 900
900 (this color)
#423371
oklch(37.1% 0.103 291.7)
-
Step 950
950
#271F43
oklch(26.9% 0.065 291.6)
#423371 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) | #183E73 | 0.060 |
| Deuteranopia (no green cones) | #1B3C70 | 0.057 |
| Tritanopia (no blue cones) | #36404D | 0.083 |
| Achromatopsia (no color) | #3D3D3D | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #423371
#423371
oklch(37.1% 0.103 291.7)
- #424400
#424400
oklch(37.2% 0.082 111.7)
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 #423371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.050
- Blueberry #464196 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.071
- Prussian Blue #1D3557 ΔE 0.074
- Marine Blue #01386A ΔE 0.076
- Cobalt #1E488F ΔE 0.079
- Dark Grey Blue #29465B ΔE 0.081
- Indigo #4B0082 ΔE 0.086
Use #423371 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.