#553B74
Closest named color: Dark Slate Blue (#483D8B). oklch(40.8% 0.096 303.5), rgb(85, 59, 116).
Aa
White text reads best on this color (9.27:1).
About this color
#553B74 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.096 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.044 away. White text reads best on it, at 9.27:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.096) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #553B74 |
| RGB | rgb(85, 59, 116) |
| HSL | hsl(267, 33%, 34%) |
| OKLCH | oklch(40.8% 0.096 303.5) |
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 #553B74 | 9.27:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #553B74 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #553B74 text on white | 9.27:1 | AAA | Lc 91.2 | Preferred for body text |
| #553B74 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#ECE7F3
oklch(93.5% 0.017 304.8)
-
Step 200
200
#DDD5EB
oklch(88.6% 0.031 302.3)
-
Step 300
300
#C8B8DF
oklch(80.9% 0.057 303.8)
-
Step 400
400
#AC93CF
oklch(70.7% 0.09 303.3)
-
Step 500
500
#9877C2
oklch(63.1% 0.115 303.5)
-
Step 600
600
#835FAF
oklch(55.7% 0.125 303.3)
-
Step 700
700
#6F4E96
oklch(49.2% 0.116 303.6)
-
Step 800
800 (this color)
#553B74
oklch(40.8% 0.096 303.5)
-
Step 900
900
#4A3762
oklch(37.7% 0.075 303.4)
-
Step 950
950
#2B2039
oklch(26.9% 0.047 303.6)
#553B74 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) | #2B4676 | 0.068 |
| Deuteranopia (no green cones) | #314773 | 0.063 |
| Tritanopia (no blue cones) | #504552 | 0.072 |
| Achromatopsia (no color) | #474747 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B74
#553B74
oklch(40.8% 0.096 303.5)
- #405207
#405207
oklch(40.9% 0.096 123.3)
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 #553B74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.044
- Blueberry #464196 ΔE 0.061
- Twilight #4E518B ΔE 0.065
- Dusk #4E5481 ΔE 0.069
- Rebecca Purple #663399 ΔE 0.072
- Dusty Grape #545775 ΔE 0.080
- Cobalt #1E488F ΔE 0.087
- Dusk Blue #26538D ΔE 0.089
Use #553B74 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.