#553B7F
Closest named color: Dark Slate Blue (#483D8B). oklch(41.5% 0.111 299.1), rgb(85, 59, 127).
Aa
White text reads best on this color (9.05:1).
About this color
#553B7F is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.111 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 9.05:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.111) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.31:1 |
| White text | 9.05:1 |
Values
| HEX | #553B7F |
| RGB | rgb(85, 59, 127) |
| HSL | hsl(263, 37%, 36%) |
| OKLCH | oklch(41.5% 0.111 299.1) |
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 #553B7F | 9.05:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #553B7F | 2.31:1 | Fails | Lc 13.4 | Not readable |
| #553B7F text on white | 9.05:1 | AAA | Lc 90.6 | Preferred for body text |
| #553B7F text on black | 2.31:1 | Fails | Lc -11.7 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F5
oklch(93.5% 0.019 299.1)
-
Step 200
200
#DCD4EE
oklch(88.4% 0.036 299.7)
-
Step 300
300
#C6B8E5
oklch(80.9% 0.064 299.2)
-
Step 400
400
#AA92D9
oklch(70.8% 0.105 299.3)
-
Step 500
500
#9575CE
oklch(63% 0.133 299.1)
-
Step 600
600
#805CBB
oklch(55.5% 0.145 299.1)
-
Step 700
700
#6C4BA1
oklch(49% 0.135 299.1)
-
Step 800
800 (this color)
#553B7F
oklch(41.5% 0.111 299.1)
-
Step 900
900
#483669
oklch(37.8% 0.086 298.5)
-
Step 950
950
#2A203D
oklch(27% 0.054 298.6)
#553B7F 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) | #224981 | 0.077 |
| Deuteranopia (no green cones) | #29487D | 0.071 |
| Tritanopia (no blue cones) | #4C4857 | 0.086 |
| Achromatopsia (no color) | #494949 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B7F
#553B7F
oklch(41.5% 0.111 299.1)
- #465300
#465300
oklch(41.6% 0.098 119.6)
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 #553B7F, 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 0.046
- Rebecca Purple #663399 ΔE 0.056
- Twilight #4E518B ΔE 0.059
- Dusk #4E5481 ΔE 0.068
- Cobalt #1E488F ΔE 0.081
- Dusty Grape #545775 ΔE 0.085
- Dusk Blue #26538D ΔE 0.085
Use #553B7F 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.