#645A8A
Closest named color: Dusk (#4E5481). oklch(49.7% 0.076 293), rgb(100, 90, 138).
Aa
White text reads best on this color (6.22:1).
About this color
#645A8A is a medium-dark, moderately saturated purple. In OKLCH its lightness is 50%, its chroma 0.076 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.042 away. White text reads best on it, at 6.22:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.076) |
| Temperature | in between |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #645A8A |
| RGB | rgb(100, 90, 138) |
| HSL | hsl(252, 21%, 45%) |
| OKLCH | oklch(49.7% 0.076 293) |
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 #645A8A | 6.22:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #645A8A | 3.37:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #645A8A text on white | 6.22:1 | AA | Lc 81.0 | Fine for body text |
| #645A8A text on black | 3.37:1 | AA large text | Lc -20.8 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#EAE9F0
oklch(93.7% 0.009 292.8)
-
Step 200
200
#D9D7E6
oklch(88.5% 0.021 292.1)
-
Step 300
300
#C1BDD7
oklch(81% 0.036 292.6)
-
Step 400
400
#A19AC3
oklch(70.6% 0.06 292.6)
-
Step 500
500
#8B81B3
oklch(63.1% 0.075 293.3)
-
Step 600
600
#756A9F
oklch(55.6% 0.082 293.1)
-
Step 700
700 (this color)
#645A8A
oklch(49.7% 0.076 293)
-
Step 800
800
#50486F
oklch(42.6% 0.064 292.9)
-
Step 900
900
#423D59
oklch(37.7% 0.048 292.1)
-
Step 950
950
#272434
oklch(27.1% 0.03 292.9)
#645A8A 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) | #4D618C | 0.037 |
| Deuteranopia (no green cones) | #4E6089 | 0.035 |
| Tritanopia (no blue cones) | #5C626C | 0.062 |
| Achromatopsia (no color) | #616161 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645A8A
#645A8A
oklch(49.7% 0.076 293)
- #636731
#636731
oklch(49.7% 0.076 112.6)
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 #645A8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.043
- Dusty Grape #545775 ΔE 0.044
- Twilight #4E518B ΔE 0.046
- Muted Purple #805B87 ΔE 0.048
- Dusty Purple #825F87 ΔE 0.054
- Dull Purple #84597E ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.058
Use #645A8A 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.