#633388
Closest named color: Rebecca Purple (#663399). oklch(42.4% 0.14 307.5), rgb(99, 51, 136).
Aa
White text reads best on this color (8.89:1).
About this color
#633388 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.140 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.028 away. White text reads best on it, at 8.89:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.140) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.35:1 |
| White text | 8.89:1 |
Values
| HEX | #633388 |
| RGB | rgb(99, 51, 136) |
| HSL | hsl(274, 45%, 37%) |
| OKLCH | oklch(42.4% 0.14 307.5) |
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 #633388 | 8.89:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #633388 | 2.35:1 | Fails | Lc 14.0 | Not readable |
| #633388 text on white | 8.89:1 | AAA | Lc 89.9 | Fine for body text |
| #633388 text on black | 2.35:1 | Fails | Lc -12.3 | 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
#EEE6F6
oklch(93.6% 0.023 308.2)
-
Step 200
200
#E1D2F1
oklch(88.5% 0.045 307.2)
-
Step 300
300
#CFB3EA
oklch(80.9% 0.082 307.7)
-
Step 400
400
#B789DF
oklch(70.7% 0.131 307.9)
-
Step 500
500
#A569D6
oklch(63.1% 0.167 307.7)
-
Step 600
600
#904EC4
oklch(55.7% 0.181 307.3)
-
Step 700
700
#7B3EA9
oklch(49.2% 0.168 307.6)
-
Step 800
800 (this color)
#633388
oklch(42.4% 0.14 307.5)
-
Step 900
900
#512E6D
oklch(37.6% 0.109 307.6)
-
Step 950
950
#301C40
oklch(27.1% 0.068 308.1)
#633388 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) | #0B488B | 0.119 |
| Deuteranopia (no green cones) | #254A86 | 0.105 |
| Tritanopia (no blue cones) | #5D4458 | 0.100 |
| Achromatopsia (no color) | #4A4A4A | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #633388
#633388
oklch(42.4% 0.14 307.5)
- #3D5900
#3D5900
oklch(42.6% 0.111 127.7)
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 #633388, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.028
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.062
- Twilight #4E518B ΔE 0.080
- Purple #800080 ΔE 0.080
- Chrysanthemum #560BAD ΔE 0.088
- Light Eggplant #894585 ΔE 0.091
- Grape #7209B7 ΔE 0.092
Use #633388 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.