#645CE3
Closest named color: Dark Periwinkle (#665FD1). oklch(55.8% 0.198 280.5), rgb(100, 92, 227).
Aa
White text reads best on this color (5.02:1).
About this color
#645CE3 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.198 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.029 away. White text reads best on it, at 5.02:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.18:1 |
| White text | 5.02:1 |
Values
| HEX | #645CE3 |
| RGB | rgb(100, 92, 227) |
| HSL | hsl(244, 71%, 63%) |
| OKLCH | oklch(55.8% 0.198 280.5) |
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 #645CE3 | 5.02:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #645CE3 | 4.18:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #645CE3 text on white | 5.02:1 | AA | Lc 74.3 | Content text, not long reading |
| #645CE3 text on black | 4.18:1 | AA large text | Lc -27.4 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B5BBFA
oklch(81% 0.089 280)
-
Step 400
400
#9194F7
oklch(70.6% 0.143 280.7)
-
Step 500
500
#7876F3
oklch(63% 0.182 280.5)
-
Step 600
600 (this color)
#645CE3
oklch(55.8% 0.198 280.5)
-
Step 700
700
#534AC4
oklch(49.1% 0.183 280.5)
-
Step 800
800
#433E9F
oklch(42.8% 0.152 280.1)
-
Step 900
900
#38367E
oklch(37.7% 0.118 280.3)
-
Step 950
950
#21204A
oklch(27% 0.076 281.1)
#645CE3 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) | #0074E7 | 0.085 |
| Deuteranopia (no green cones) | #006AE0 | 0.080 |
| Tritanopia (no blue cones) | #207C97 | 0.169 |
| Achromatopsia (no color) | #6F6F6F | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645CE3
#645CE3
oklch(55.8% 0.198 280.5)
- #847500
#847500
oklch(55.9% 0.116 100.4)
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 #645CE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.029
- Light Indigo #6D5ACF ΔE 0.033
- Slate Blue #6A5ACD ΔE 0.035
- Warm Blue #4B57DB ΔE 0.040
- Neon Blue #4361EE ΔE 0.044
- Iris #6258C4 ΔE 0.048
- Royal Blue #4169E1 ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.049
Use #645CE3 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.