#553F8F
Closest named color: Dark Slate Blue (#483D8B). oklch(43.3% 0.127 293), rgb(85, 63, 143).
Aa
White text reads best on this color (8.42:1).
About this color
#553F8F is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.127 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 0.024 away. White text reads best on it, at 8.42:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.49:1 |
| White text | 8.42:1 |
Values
| HEX | #553F8F |
| RGB | rgb(85, 63, 143) |
| HSL | hsl(257, 39%, 40%) |
| OKLCH | oklch(43.3% 0.127 293) |
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 #553F8F | 8.42:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #553F8F | 2.49:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #553F8F text on white | 8.42:1 | AAA | Lc 88.8 | Fine for body text |
| #553F8F text on black | 2.49:1 | Fails | Lc -13.4 | 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
#EAE7F7
oklch(93.5% 0.022 294.6)
-
Step 200
200
#DAD5F3
oklch(88.6% 0.041 293.2)
-
Step 300
300
#C2B8ED
oklch(80.9% 0.075 293.3)
-
Step 400
400
#A492E4
oklch(70.8% 0.119 293.2)
-
Step 500
500
#8E75DC
oklch(63.2% 0.151 292.7)
-
Step 600
600
#795BC9
oklch(55.6% 0.164 292.8)
-
Step 700
700
#664AAE
oklch(49.1% 0.153 292.8)
-
Step 800
800 (this color)
#553F8F
oklch(43.3% 0.127 293)
-
Step 900
900
#453571
oklch(37.8% 0.1 293.3)
-
Step 950
950
#282042
oklch(27.1% 0.062 292.6)
#553F8F 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) | #194E92 | 0.079 |
| Deuteranopia (no green cones) | #1F4C8D | 0.075 |
| Tritanopia (no blue cones) | #465061 | 0.102 |
| Achromatopsia (no color) | #4D4D4D | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553F8F
#553F8F
oklch(43.3% 0.127 293)
- #515600
#515600
oklch(43.4% 0.097 113.6)
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 #553F8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.024
- Blueberry #464196 ΔE 0.027
- Rebecca Purple #663399 ΔE 0.043
- Twilight #4E518B ΔE 0.050
- Dusk #4E5481 ΔE 0.066
- Cobalt #1E488F ΔE 0.074
- Dusk Blue #26538D ΔE 0.077
- Denim Blue #3B5B92 ΔE 0.080
Use #553F8F 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.