#553B88
Closest named color: Dark Slate Blue (#483D8B). oklch(42.1% 0.124 296.3), rgb(85, 59, 136).
Aa
White text reads best on this color (8.87:1).
About this color
#553B88 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.124 and its hue 296°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 8.87:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.124) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #553B88 |
| RGB | rgb(85, 59, 136) |
| HSL | hsl(260, 39%, 38%) |
| OKLCH | oklch(42.1% 0.124 296.3) |
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 #553B88 | 8.87:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #553B88 | 2.36:1 | Fails | Lc 13.9 | Not readable |
| #553B88 text on white | 8.87:1 | AAA | Lc 90.0 | Preferred for body text |
| #553B88 text on black | 2.36:1 | Fails | Lc -12.2 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F7
oklch(93.6% 0.022 297.4)
-
Step 200
200
#DBD4F1
oklch(88.4% 0.04 296.6)
-
Step 300
300
#C4B8EB
oklch(81% 0.072 295.5)
-
Step 400
400
#A791E0
oklch(70.7% 0.115 296.1)
-
Step 500
500
#9374D8
oklch(63.2% 0.148 296.2)
-
Step 600
600
#7E5AC5
oklch(55.6% 0.161 296.3)
-
Step 700
700
#6A49AA
oklch(49% 0.15 296.1)
-
Step 800
800 (this color)
#553B88
oklch(42.1% 0.124 296.3)
-
Step 900
900
#47356E
oklch(37.8% 0.095 296.1)
-
Step 950
950
#291F41
oklch(26.9% 0.062 295.5)
#553B88 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) | #194A8B | 0.082 |
| Deuteranopia (no green cones) | #214986 | 0.077 |
| Tritanopia (no blue cones) | #494B5B | 0.099 |
| Achromatopsia (no color) | #4A4A4A | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553B88
#553B88
oklch(42.1% 0.124 296.3)
- #4B5300
#4B5300
oklch(42.1% 0.096 116)
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 #553B88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.035
- Rebecca Purple #663399 ΔE 0.045
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.071
- Cobalt #1E488F ΔE 0.078
- Dusk Blue #26538D ΔE 0.084
- Denim Blue #3B5B92 ΔE 0.089
Use #553B88 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.