#553B71
Closest named color: Dark Slate Blue (#483D8B). oklch(40.6% 0.092 304.9), rgb(85, 59, 113).
Aa
White text reads best on this color (9.33:1).
About this color
#553B71 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.092 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.049 away. White text reads best on it, at 9.33:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.092) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.33:1 |
Values
| HEX | #553B71 |
| RGB | rgb(85, 59, 113) |
| HSL | hsl(269, 31%, 34%) |
| OKLCH | oklch(40.6% 0.092 304.9) |
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 #553B71 | 9.33:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #553B71 | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #553B71 text on white | 9.33:1 | AAA | Lc 91.4 | Preferred for body text |
| #553B71 text on black | 2.25:1 | Fails | Lc -11.0 | 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
#F6F4F9
oklch(97% 0.007 304.2)
-
Step 100
100
#ECE7F2
oklch(93.5% 0.016 306.4)
-
Step 200
200
#DDD5E9
oklch(88.5% 0.028 303.9)
-
Step 300
300
#C8B8DD
oklch(80.8% 0.054 304.8)
-
Step 400
400
#AD93CC
oklch(70.7% 0.086 305.1)
-
Step 500
500
#9978BF
oklch(63.2% 0.11 304.8)
-
Step 600
600
#845FAB
oklch(55.6% 0.12 305.3)
-
Step 700
700
#6F4E93
oklch(49% 0.112 304.7)
-
Step 800
800 (this color)
#553B71
oklch(40.6% 0.092 304.9)
-
Step 900
900
#4A3760
oklch(37.6% 0.072 304.5)
-
Step 950
950
#2C2038
oklch(26.9% 0.046 306.5)
#553B71 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) | #2D4673 | 0.066 |
| Deuteranopia (no green cones) | #334770 | 0.061 |
| Tritanopia (no blue cones) | #504450 | 0.069 |
| Achromatopsia (no color) | #474747 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B71
#553B71
oklch(40.6% 0.092 304.9)
- #3E510F
#3E510F
oklch(40.5% 0.092 124.7)
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 #553B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.066
- Twilight #4E518B ΔE 0.067
- Dusk #4E5481 ΔE 0.069
- Rebecca Purple #663399 ΔE 0.076
- Dusty Grape #545775 ΔE 0.079
- Dark Grey Blue #29465B ΔE 0.087
- Cobalt #1E488F ΔE 0.089
Use #553B71 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.