#553F70
Closest named color: Dark Slate Blue (#483D8B). oklch(41.4% 0.083 303.7), rgb(85, 63, 112).
Aa
White text reads best on this color (9.00:1).
About this color
#553F70 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.083 and its hue 304°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.052 away. White text reads best on it, at 9.00:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.083) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.33:1 |
| White text | 9.00:1 |
Values
| HEX | #553F70 |
| RGB | rgb(85, 63, 112) |
| HSL | hsl(267, 28%, 34%) |
| OKLCH | oklch(41.4% 0.083 303.7) |
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 #553F70 | 9.00:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #553F70 | 2.33:1 | Fails | Lc 13.4 | Not readable |
| #553F70 text on white | 9.00:1 | AAA | Lc 90.6 | Preferred for body text |
| #553F70 text on black | 2.33:1 | 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
#F6F4F9
oklch(97% 0.007 304.2)
-
Step 100
100
#ECE8F2
oklch(93.7% 0.014 304.1)
-
Step 200
200
#DDD5E8
oklch(88.5% 0.027 304.8)
-
Step 300
300
#C7B9DB
oklch(80.8% 0.05 304)
-
Step 400
400
#AB95C9
oklch(70.8% 0.078 303.8)
-
Step 500
500
#967ABB
oklch(63.1% 0.1 303.4)
-
Step 600
600
#8162A7
oklch(55.6% 0.109 303.8)
-
Step 700
700
#6D518F
oklch(49.1% 0.101 303.7)
-
Step 800
800 (this color)
#553F70
oklch(41.4% 0.083 303.7)
-
Step 900
900
#49395E
oklch(37.8% 0.064 303.3)
-
Step 950
950
#2B2137
oklch(27% 0.042 304.6)
#553F70 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) | #334872 | 0.056 |
| Deuteranopia (no green cones) | #38496F | 0.052 |
| Tritanopia (no blue cones) | #514752 | 0.063 |
| Achromatopsia (no color) | #494949 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #553F70
#553F70
oklch(41.4% 0.083 303.7)
- #42531A
#42531A
oklch(41.5% 0.084 124.1)
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 #553F70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.052
- Twilight #4E518B ΔE 0.060
- Dusk #4E5481 ΔE 0.060
- Blueberry #464196 ΔE 0.067
- Dusty Grape #545775 ΔE 0.068
- YInMn Blue #415A77 ΔE 0.080
- Dark Grey Blue #29465B ΔE 0.081
- Rebecca Purple #663399 ΔE 0.082
Use #553F70 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.