#4F378F
Closest named color: Dark Slate Blue (#483D8B). oklch(41.3% 0.139 291.7), rgb(79, 55, 143).
Aa
White text reads best on this color (9.22:1).
About this color
#4F378F is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.139 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 0.019 away. White text reads best on it, at 9.22:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #4F378F |
| RGB | rgb(79, 55, 143) |
| HSL | hsl(256, 44%, 39%) |
| OKLCH | oklch(41.3% 0.139 291.7) |
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 #4F378F | 9.22:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #4F378F | 2.27:1 | Fails | Lc 13.0 | Not readable |
| #4F378F text on white | 9.22:1 | AAA | Lc 90.9 | Preferred for body text |
| #4F378F text on black | 2.27:1 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE7F9
oklch(93.6% 0.024 293.6)
-
Step 200
200
#D9D4F5
oklch(88.4% 0.045 292.4)
-
Step 300
300
#C1B8F2
oklch(81% 0.081 291.6)
-
Step 400
400
#A291EB
oklch(70.8% 0.13 291.4)
-
Step 500
500
#8D72E4
oklch(63% 0.166 291.8)
-
Step 600
600
#7858D2
oklch(55.6% 0.18 291.5)
-
Step 700
700
#6647B6
oklch(49.2% 0.168 291.9)
-
Step 800
800 (this color)
#4F378F
oklch(41.3% 0.139 291.7)
-
Step 900
900
#443475
oklch(37.8% 0.107 291.8)
-
Step 950
950
#281F45
oklch(27.1% 0.069 292.1)
#4F378F 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) | #004992 | 0.087 |
| Deuteranopia (no green cones) | #00468D | 0.086 |
| Tritanopia (no blue cones) | #3D4B5D | 0.113 |
| Achromatopsia (no color) | #474747 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F378F
#4F378F
oklch(41.3% 0.139 291.7)
- #4D4F00
#4D4F00
oklch(41.2% 0.091 111.4)
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 #4F378F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.019
- Blueberry #464196 ΔE 0.029
- Rebecca Purple #663399 ΔE 0.046
- Twilight #4E518B ΔE 0.069
- Cobalt #1E488F ΔE 0.073
- Chrysanthemum #560BAD ΔE 0.077
- Imperial Purple #480CA8 ΔE 0.078
- Sapphire #2138AB ΔE 0.081
Use #4F378F 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.