#645FD9
Closest named color: Dark Periwinkle (#665FD1). oklch(55.6% 0.181 280.6), rgb(100, 95, 217).
Aa
White text reads best on this color (5.02:1).
About this color
#645FD9 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.181 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.013 away. White text reads best on it, at 5.02:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.18:1 |
| White text | 5.02:1 |
Values
| HEX | #645FD9 |
| RGB | rgb(100, 95, 217) |
| HSL | hsl(242, 62%, 61%) |
| OKLCH | oklch(55.6% 0.181 280.6) |
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 #645FD9 | 5.02:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #645FD9 | 4.18:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #645FD9 text on white | 5.02:1 | AA | Lc 74.4 | Content text, not long reading |
| #645FD9 text on black | 4.18:1 | AA large text | Lc -27.3 | 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
#E6E8FA
oklch(93.5% 0.024 280.9)
-
Step 200
200
#D3D6F7
oklch(88.4% 0.045 281.3)
-
Step 300
300
#B6BBF5
oklch(80.8% 0.082 280.6)
-
Step 400
400
#9296F0
oklch(70.7% 0.131 280.6)
-
Step 500
500
#7979EB
oklch(63.1% 0.167 280.5)
-
Step 600
600 (this color)
#645FD9
oklch(55.6% 0.181 280.6)
-
Step 700
700
#534DBC
oklch(49% 0.169 280.6)
-
Step 800
800
#444098
oklch(42.6% 0.14 280.7)
-
Step 900
900
#393879
oklch(37.8% 0.108 280.6)
-
Step 950
950
#212147
oklch(27% 0.069 280.7)
#645FD9 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) | #0074DD | 0.083 |
| Deuteranopia (no green cones) | #006AD6 | 0.079 |
| Tritanopia (no blue cones) | #2E7B93 | 0.155 |
| Achromatopsia (no color) | #6F6F6F | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645FD9
#645FD9
oklch(55.6% 0.181 280.6)
- #837400
#837400
oklch(55.6% 0.116 100.3)
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 #645FD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.013
- Light Indigo #6D5ACF ΔE 0.022
- Slate Blue #6A5ACD ΔE 0.022
- Iris #6258C4 ΔE 0.036
- Warm Blue #4B57DB ΔE 0.042
- Royal Blue #4169E1 ΔE 0.046
- Neon Blue #4361EE ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.052
Use #645FD9 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.