#553A79
Closest named color: Dark Slate Blue (#483D8B). oklch(40.9% 0.105 301.7), rgb(85, 58, 121).
Aa
White text reads best on this color (9.26:1).
About this color
#553A79 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.105 and its hue 302°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 9.26:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.105) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #553A79 |
| RGB | rgb(85, 58, 121) |
| HSL | hsl(266, 35%, 35%) |
| OKLCH | oklch(40.9% 0.105 301.7) |
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 #553A79 | 9.26:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #553A79 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #553A79 text on white | 9.26:1 | AAA | Lc 91.2 | Preferred for body text |
| #553A79 text on black | 2.26:1 | Fails | Lc -11.2 | 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 800.
-
Step 50
50
#F6F4FA
oklch(97% 0.008 301.4)
-
Step 100
100
#ECE7F4
oklch(93.6% 0.018 303.4)
-
Step 200
200
#DDD4EC
oklch(88.4% 0.034 302.7)
-
Step 300
300
#C7B8E2
oklch(80.9% 0.06 301.4)
-
Step 400
400
#AC92D4
oklch(70.7% 0.098 302)
-
Step 500
500
#9776C8
oklch(63.1% 0.124 301.5)
-
Step 600
600
#825DB5
oklch(55.6% 0.136 301.5)
-
Step 700
700
#6E4C9C
oklch(49% 0.127 301.5)
-
Step 800
800 (this color)
#553A79
oklch(40.9% 0.105 301.7)
-
Step 900
900
#4A3666
oklch(37.8% 0.082 301.8)
-
Step 950
950
#2B203B
oklch(27% 0.051 301.9)
#553A79 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) | #26477B | 0.074 |
| Deuteranopia (no green cones) | #2D4777 | 0.068 |
| Tritanopia (no blue cones) | #4E4654 | 0.080 |
| Achromatopsia (no color) | #474747 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553A79
#553A79
oklch(40.9% 0.105 301.7)
- #425200
#425200
oklch(41% 0.099 121.7)
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 #553A79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Blueberry #464196 ΔE 0.055
- Rebecca Purple #663399 ΔE 0.063
- Twilight #4E518B ΔE 0.064
- Dusk #4E5481 ΔE 0.071
- Dusty Grape #545775 ΔE 0.084
- Cobalt #1E488F ΔE 0.085
- Dusk Blue #26538D ΔE 0.089
Use #553A79 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.