#645CD5
Closest named color: Dark Periwinkle (#665FD1). oklch(54.8% 0.18 281.6), rgb(100, 92, 213).
Aa
White text reads best on this color (5.20:1).
About this color
#645CD5 is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.180 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.010 away. White text reads best on it, at 5.20:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.03:1 |
| White text | 5.20:1 |
Values
| HEX | #645CD5 |
| RGB | rgb(100, 92, 213) |
| HSL | hsl(244, 59%, 60%) |
| OKLCH | oklch(54.8% 0.18 281.6) |
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 #645CD5 | 5.20:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #645CD5 | 4.03:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #645CD5 text on white | 5.20:1 | AA | Lc 75.5 | Fine for body text |
| #645CD5 text on black | 4.03:1 | AA large text | Lc -26.3 | 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
#B7BBF4
oklch(80.9% 0.08 281.3)
-
Step 400
400
#9496EF
oklch(70.8% 0.129 281.6)
-
Step 500
500
#7B79EA
oklch(63.2% 0.166 281.4)
-
Step 600
600 (this color)
#645CD5
oklch(54.8% 0.18 281.6)
-
Step 700
700
#554DBB
oklch(49.1% 0.167 281.6)
-
Step 800
800
#454097
oklch(42.6% 0.138 281.4)
-
Step 900
900
#3A3778
oklch(37.6% 0.108 282)
-
Step 950
950
#222147
oklch(27.1% 0.069 282)
#645CD5 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) | #0071D9 | 0.085 |
| Deuteranopia (no green cones) | #0068D2 | 0.082 |
| Tritanopia (no blue cones) | #337890 | 0.153 |
| Achromatopsia (no color) | #6D6D6D | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645CD5
#645CD5
oklch(54.8% 0.18 281.6)
- #7F7200
#7F7200
oklch(54.7% 0.114 101.5)
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 #645CD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.010
- Slate Blue #6A5ACD ΔE 0.015
- Light Indigo #6D5ACF ΔE 0.017
- Iris #6258C4 ΔE 0.028
- Warm Blue #4B57DB ΔE 0.040
- Royal Blue #4169E1 ΔE 0.051
- Neon Blue #4361EE ΔE 0.056
- Medium Slate Blue #7B68EE ΔE 0.060
Use #645CD5 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.