#553D79
Closest named color: Dark Slate Blue (#483D8B). oklch(41.5% 0.1 300.6), rgb(85, 61, 121).
Aa
White text reads best on this color (9.01:1).
About this color
#553D79 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.100 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.038 away. White text reads best on it, at 9.01:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.100) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.32:1 |
| White text | 9.01:1 |
Values
| HEX | #553D79 |
| RGB | rgb(85, 61, 121) |
| HSL | hsl(264, 33%, 36%) |
| OKLCH | oklch(41.5% 0.1 300.6) |
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 #553D79 | 9.01:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #553D79 | 2.32:1 | Fails | Lc 13.4 | Not readable |
| #553D79 text on white | 9.01:1 | AAA | Lc 90.5 | Preferred for body text |
| #553D79 text on black | 2.32:1 | Fails | Lc -11.8 | 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
#EBE7F4
oklch(93.5% 0.018 300.1)
-
Step 200
200
#DCD5EC
oklch(88.6% 0.032 299.6)
-
Step 300
300
#C6B9E1
oklch(81% 0.057 300)
-
Step 400
400
#AA93D2
oklch(70.7% 0.093 300.8)
-
Step 500
500
#9577C6
oklch(63% 0.12 300.5)
-
Step 600
600
#805FB3
oklch(55.6% 0.13 300.4)
-
Step 700
700
#6C4E9A
oklch(49.1% 0.121 300.2)
-
Step 800
800 (this color)
#553D79
oklch(41.5% 0.1 300.6)
-
Step 900
900
#483764
oklch(37.6% 0.077 300.1)
-
Step 950
950
#2A203B
oklch(26.9% 0.05 300.1)
#553D79 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) | #2B497B | 0.067 |
| Deuteranopia (no green cones) | #304978 | 0.063 |
| Tritanopia (no blue cones) | #4E4855 | 0.077 |
| Achromatopsia (no color) | #494949 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553D79
#553D79
oklch(41.5% 0.1 300.6)
- #455300
#455300
oklch(41.5% 0.099 120.2)
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 #553D79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.038
- Blueberry #464196 ΔE 0.054
- Twilight #4E518B ΔE 0.057
- Dusk #4E5481 ΔE 0.063
- Rebecca Purple #663399 ΔE 0.066
- Dusty Grape #545775 ΔE 0.076
- Cobalt #1E488F ΔE 0.082
- Dusk Blue #26538D ΔE 0.083
Use #553D79 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.