#633D88
Closest named color: Rebecca Purple (#663399). oklch(44% 0.123 305.3), rgb(99, 61, 136).
Aa
White text reads best on this color (8.22:1).
About this color
#633D88 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.123 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.037 away. White text reads best on it, at 8.22:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #633D88 |
| RGB | rgb(99, 61, 136) |
| HSL | hsl(270, 38%, 39%) |
| OKLCH | oklch(44% 0.123 305.3) |
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 #633D88 | 8.22:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #633D88 | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #633D88 text on white | 8.22:1 | AAA | Lc 88.1 | Fine for body text |
| #633D88 text on black | 2.55:1 | Fails | Lc -14.0 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE7F5
oklch(93.7% 0.02 305.3)
-
Step 200
200
#DFD3EF
oklch(88.5% 0.04 304.9)
-
Step 300
300
#CBB5E6
oklch(80.8% 0.072 305.2)
-
Step 400
400
#B28DDA
oklch(70.6% 0.116 305.7)
-
Step 500
500
#9F6FD0
oklch(63.1% 0.148 305.4)
-
Step 600
600
#8A55BD
oklch(55.6% 0.161 305.3)
-
Step 700
700
#7545A3
oklch(49.1% 0.149 305.1)
-
Step 800
800 (this color)
#633D88
oklch(44% 0.123 305.3)
-
Step 900
900
#4E326A
oklch(37.7% 0.097 305.3)
-
Step 950
950
#2E1E3E
oklch(27.1% 0.061 305.8)
#633D88 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) | #244E8B | 0.096 |
| Deuteranopia (no green cones) | #304F86 | 0.087 |
| Tritanopia (no blue cones) | #5D4B5C | 0.091 |
| Achromatopsia (no color) | #4F4F4F | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633D88
#633D88
oklch(44% 0.123 305.3)
- #445C00
#445C00
oklch(43.9% 0.111 125.2)
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 #633D88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.055
- Twilight #4E518B ΔE 0.059
- Dusk #4E5481 ΔE 0.071
- Light Eggplant #894585 ΔE 0.078
- Dusty Grape #545775 ΔE 0.086
- Denim Blue #3B5B92 ΔE 0.093
Use #633D88 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.