#645591
Closest named color: Twilight (#4E518B). oklch(49.1% 0.095 294.1), rgb(100, 85, 145).
Aa
White text reads best on this color (6.46:1).
About this color
#645591 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.095 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.039 away. White text reads best on it, at 6.46:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.095) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.25:1 |
| White text | 6.46:1 |
Values
| HEX | #645591 |
| RGB | rgb(100, 85, 145) |
| HSL | hsl(255, 26%, 45%) |
| OKLCH | oklch(49.1% 0.095 294.1) |
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 #645591 | 6.46:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #645591 | 3.25:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #645591 text on white | 6.46:1 | AA | Lc 82.0 | Fine for body text |
| #645591 text on black | 3.25:1 | AA large text | Lc -19.9 | 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
#EAE8F2
oklch(93.5% 0.014 295.3)
-
Step 200
200
#DAD6E9
oklch(88.5% 0.026 295.5)
-
Step 300
300
#C2BBDC
oklch(80.8% 0.047 295.1)
-
Step 400
400
#A398CB
oklch(70.7% 0.074 294.3)
-
Step 500
500
#8D7EBD
oklch(63.1% 0.094 294.5)
-
Step 600
600
#7767A9
oklch(55.7% 0.101 294)
-
Step 700
700 (this color)
#645591
oklch(49.1% 0.095 294.1)
-
Step 800
800
#524676
oklch(42.8% 0.079 294.3)
-
Step 900
900
#433B5F
oklch(37.7% 0.061 293.5)
-
Step 950
950
#272338
oklch(27.1% 0.039 292.3)
#645591 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) | #445F93 | 0.050 |
| Deuteranopia (no green cones) | #465D8F | 0.048 |
| Tritanopia (no blue cones) | #5A606C | 0.078 |
| Achromatopsia (no color) | #5E5E5E | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645591
#645591
oklch(49.1% 0.095 294.1)
- #60661D
#60661D
oklch(49% 0.095 113.9)
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 #645591, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.039
- Dusk #4E5481 ΔE 0.044
- Dusky Blue #475F94 ΔE 0.047
- Dusty Grape #545775 ΔE 0.055
- Muted Purple #805B87 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.058
- Dusty Purple #825F87 ΔE 0.064
- Dull Purple #84597E ΔE 0.066
Use #645591 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.