#645BD2
Closest named color: Dark Periwinkle (#665FD1). oklch(54.4% 0.177 282.2), rgb(100, 91, 210).
Aa
White text reads best on this color (5.29:1).
About this color
#645BD2 is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.177 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.011 away. White text reads best on it, at 5.29:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #645BD2 |
| RGB | rgb(100, 91, 210) |
| HSL | hsl(245, 57%, 59%) |
| OKLCH | oklch(54.4% 0.177 282.2) |
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 #645BD2 | 5.29:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #645BD2 | 3.96:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #645BD2 text on white | 5.29:1 | AA | Lc 76.0 | Fine for body text |
| #645BD2 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
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F6
oklch(88.5% 0.044 282.6)
-
Step 300
300
#B8BBF3
oklch(80.9% 0.079 282.1)
-
Step 400
400
#9596EE
oklch(70.8% 0.127 282.1)
-
Step 500
500
#7C79E8
oklch(63.1% 0.163 281.9)
-
Step 600
600 (this color)
#645BD2
oklch(54.4% 0.177 282.2)
-
Step 700
700
#564DBA
oklch(49.1% 0.166 282.1)
-
Step 800
800
#464096
oklch(42.7% 0.136 282.1)
-
Step 900
900
#3A3778
oklch(37.6% 0.108 282)
-
Step 950
950
#222146
oklch(27% 0.067 282.1)
#645BD2 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) | #0070D6 | 0.085 |
| Deuteranopia (no green cones) | #0067D0 | 0.082 |
| Tritanopia (no blue cones) | #36768E | 0.150 |
| Achromatopsia (no color) | #6B6B6B | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645BD2
#645BD2
oklch(54.4% 0.177 282.2)
- #7D7100
#7D7100
oklch(54.3% 0.114 102.1)
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 #645BD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.011
- Slate Blue #6A5ACD ΔE 0.012
- Light Indigo #6D5ACF ΔE 0.015
- Iris #6258C4 ΔE 0.023
- Warm Blue #4B57DB ΔE 0.040
- Royal Blue #4169E1 ΔE 0.054
- Bluey Purple #6241C7 ΔE 0.059
- Neon Blue #4361EE ΔE 0.059
Use #645BD2 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.