#645CDE
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.192 280.9), rgb(100, 92, 222).
Aa
White text reads best on this color (5.08:1).
About this color
#645CDE is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.192 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.022 away. White text reads best on it, at 5.08:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #645CDE |
| RGB | rgb(100, 92, 222) |
| HSL | hsl(244, 66%, 62%) |
| OKLCH | oklch(55.5% 0.192 280.9) |
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 #645CDE | 5.08:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #645CDE | 4.12:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #645CDE text on white | 5.08:1 | AA | Lc 74.7 | Content text, not long reading |
| #645CDE text on black | 4.12:1 | AA large text | Lc -27.0 | 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
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D3D6F9
oklch(88.5% 0.048 281.5)
-
Step 300
300
#B6BBF8
oklch(81% 0.086 280.6)
-
Step 400
400
#9295F4
oklch(70.7% 0.138 280.9)
-
Step 500
500
#7977F0
oklch(63% 0.177 280.8)
-
Step 600
600 (this color)
#645CDE
oklch(55.5% 0.192 280.9)
-
Step 700
700
#544BC1
oklch(49.1% 0.178 281)
-
Step 800
800
#443E9C
oklch(42.6% 0.148 280.9)
-
Step 900
900
#39367C
oklch(37.6% 0.115 281.2)
-
Step 950
950
#212049
oklch(26.9% 0.074 281.3)
#645CDE 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) | #0073E2 | 0.085 |
| Deuteranopia (no green cones) | #0069DB | 0.080 |
| Tritanopia (no blue cones) | #287B94 | 0.165 |
| Achromatopsia (no color) | #6E6E6E | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645CDE
#645CDE
oklch(55.5% 0.192 280.9)
- #827400
#827400
oklch(55.5% 0.116 101)
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 #645CDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.022
- Light Indigo #6D5ACF ΔE 0.027
- Slate Blue #6A5ACD ΔE 0.028
- Warm Blue #4B57DB ΔE 0.039
- Iris #6258C4 ΔE 0.041
- Neon Blue #4361EE ΔE 0.048
- Royal Blue #4169E1 ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.052
Use #645CDE 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.