#43377C
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.113 288), rgb(67, 55, 124).
Aa
White text reads best on this color (10.11:1).
About this color
#43377C is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.113 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 10.11:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #43377C |
| RGB | rgb(67, 55, 124) |
| HSL | hsl(250, 39%, 35%) |
| OKLCH | oklch(38.7% 0.113 288) |
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 #43377C | 10.11:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #43377C | 2.07:1 | Fails | Lc 10.7 | Not readable |
| #43377C text on white | 10.11:1 | AAA | Lc 93.3 | Preferred for body text |
| #43377C text on black | 2.07:1 | Fails | Lc -9.2 | 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
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D7D5F7
oklch(88.5% 0.047 288.1)
-
Step 300
300
#BDB8F5
oklch(80.8% 0.086 288.1)
-
Step 400
400
#9D92F0
oklch(70.8% 0.135 287.8)
-
Step 500
500
#8773EA
oklch(63% 0.173 288.1)
-
Step 600
600
#7258D8
oklch(55.5% 0.188 288)
-
Step 700
700
#6047BC
oklch(49.1% 0.175 288)
-
Step 800
800
#4E3C98
oklch(42.8% 0.144 287.7)
-
Step 900
900 (this color)
#43377C
oklch(38.7% 0.113 288)
-
Step 950
950
#251F47
oklch(26.9% 0.072 287.4)
#43377C 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) | #15437E | 0.061 |
| Deuteranopia (no green cones) | #15407A | 0.060 |
| Tritanopia (no blue cones) | #324654 | 0.093 |
| Achromatopsia (no color) | #424242 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #43377C
#43377C
oklch(38.7% 0.113 288)
- #494700
#494700
oklch(38.7% 0.083 107.9)
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 #43377C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.030
- Blueberry #464196 ΔE 0.049
- Cobalt #1E488F ΔE 0.065
- Twilight Blue #0A437A ΔE 0.067
- Twilight #4E518B ΔE 0.076
- Light Navy #155084 ΔE 0.080
- Rebecca Purple #663399 ΔE 0.080
- Dusk Blue #26538D ΔE 0.081
Use #43377C 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.