#645AD5
Closest named color: Dark Periwinkle (#665FD1). oklch(54.5% 0.183 282.1), rgb(100, 90, 213).
Aa
White text reads best on this color (5.29:1).
About this color
#645AD5 is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.183 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.014 away. White text reads best on it, at 5.29:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #645AD5 |
| RGB | rgb(100, 90, 213) |
| HSL | hsl(245, 59%, 59%) |
| OKLCH | oklch(54.5% 0.183 282.1) |
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 #645AD5 | 5.29:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #645AD5 | 3.96:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #645AD5 text on white | 5.29:1 | AA | Lc 76.0 | Fine for body text |
| #645AD5 text on black | 3.96:1 | AA large text | Lc -25.8 | 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 600.
-
Step 50
50
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D4D6F7
oklch(88.5% 0.045 282.7)
-
Step 300
300
#B8BBF5
oklch(81% 0.082 282.1)
-
Step 400
400
#9495F0
oklch(70.7% 0.132 282)
-
Step 500
500
#7C78EB
oklch(63.1% 0.168 282)
-
Step 600
600 (this color)
#645AD5
oklch(54.5% 0.183 282.1)
-
Step 700
700
#564CBC
oklch(49% 0.17 282.2)
-
Step 800
800
#463F98
oklch(42.6% 0.141 282.2)
-
Step 900
900
#3A3779
oklch(37.7% 0.109 281.9)
-
Step 950
950
#222147
oklch(27.1% 0.069 282)
#645AD5 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) | #0070D9 | 0.086 |
| Deuteranopia (no green cones) | #0067D2 | 0.083 |
| Tritanopia (no blue cones) | #33778F | 0.156 |
| Achromatopsia (no color) | #6B6B6B | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645AD5
#645AD5
oklch(54.5% 0.183 282.1)
- #7D7200
#7D7200
oklch(54.5% 0.114 102.8)
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 #645AD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.014
- Slate Blue #6A5ACD ΔE 0.015
- Light Indigo #6D5ACF ΔE 0.017
- Iris #6258C4 ΔE 0.027
- Warm Blue #4B57DB ΔE 0.038
- Royal Blue #4169E1 ΔE 0.053
- Neon Blue #4361EE ΔE 0.056
- Bluey Purple #6241C7 ΔE 0.058
Use #645AD5 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.