#645C99
Closest named color: Dusky Blue (#475F94). oklch(50.9% 0.095 288.6), rgb(100, 92, 153).
Aa
White text reads best on this color (5.94:1).
About this color
#645C99 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.095 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.043 away. White text reads best on it, at 5.94:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.53:1 |
| White text | 5.94:1 |
Values
| HEX | #645C99 |
| RGB | rgb(100, 92, 153) |
| HSL | hsl(248, 25%, 48%) |
| OKLCH | oklch(50.9% 0.095 288.6) |
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 #645C99 | 5.94:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #645C99 | 3.53:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #645C99 text on white | 5.94:1 | AA | Lc 79.7 | Fine for body text |
| #645C99 text on black | 3.53:1 | AA large text | Lc -22.2 | Dividers and decoration only |
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 700.
-
Step 50
50
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F3
oklch(93.7% 0.013 286.1)
-
Step 200
200
#D8D7EA
oklch(88.6% 0.026 288.3)
-
Step 300
300
#BFBCDD
oklch(80.8% 0.046 289.5)
-
Step 400
400
#9E9ACC
oklch(70.8% 0.073 288.1)
-
Step 500
500
#8780BF
oklch(63.1% 0.094 288.5)
-
Step 600
600
#7169AC
oklch(55.7% 0.102 288.1)
-
Step 700
700 (this color)
#645C99
oklch(50.9% 0.095 288.6)
-
Step 800
800
#4D4777
oklch(42.6% 0.078 288.3)
-
Step 900
900
#403C60
oklch(37.7% 0.061 288.2)
-
Step 950
950
#262338
oklch(27% 0.039 290.1)
#645C99 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) | #49659B | 0.042 |
| Deuteranopia (no green cones) | #496297 | 0.040 |
| Tritanopia (no blue cones) | #576773 | 0.080 |
| Achromatopsia (no color) | #646464 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645C99
#645C99
oklch(50.9% 0.095 288.6)
- #6B6A1F
#6B6A1F
oklch(51% 0.095 108.6)
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 #645C99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.043
- Twilight #4E518B ΔE 0.052
- Muted Purple #805B87 ΔE 0.054
- Dusk #4E5481 ΔE 0.056
- French Blue #436BAD ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.059
- Dusty Purple #825F87 ΔE 0.060
- Denim #3B638C ΔE 0.063
Use #645C99 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.