#645CB5
Closest named color: Iris (#6258C4). oklch(52.6% 0.136 284.8), rgb(100, 92, 181).
Aa
White text reads best on this color (5.61:1).
About this color
#645CB5 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 53%, its chroma 0.136 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.027 away. White text reads best on it, at 5.61:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.73:1 |
| White text | 5.61:1 |
Values
| HEX | #645CB5 |
| RGB | rgb(100, 92, 181) |
| HSL | hsl(245, 38%, 54%) |
| OKLCH | oklch(52.6% 0.136 284.8) |
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 #645CB5 | 5.61:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #645CB5 | 3.73:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #645CB5 text on white | 5.61:1 | AA | Lc 77.9 | Fine for body text |
| #645CB5 text on black | 3.73:1 | AA large text | Lc -23.9 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BCBCE7
oklch(81% 0.06 285)
-
Step 400
400
#9A98DC
oklch(70.7% 0.099 284.9)
-
Step 500
500
#827DD2
oklch(63.1% 0.126 284.9)
-
Step 600
600 (this color)
#645CB5
oklch(52.6% 0.136 284.8)
-
Step 700
700
#5B53A5
oklch(49.1% 0.127 285.1)
-
Step 800
800
#4A4585
oklch(42.8% 0.103 284.7)
-
Step 900
900
#3D3A6B
oklch(37.6% 0.082 284.5)
-
Step 950
950
#24223F
oklch(27% 0.053 285.4)
#645CB5 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) | #366AB8 | 0.062 |
| Deuteranopia (no green cones) | #3365B3 | 0.062 |
| Tritanopia (no blue cones) | #4A6F80 | 0.116 |
| Achromatopsia (no color) | #676767 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645CB5
#645CB5
oklch(52.6% 0.136 284.8)
- #756D00
#756D00
oklch(52.5% 0.111 104.5)
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 #645CB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.027
- Slate Blue #6A5ACD ΔE 0.039
- Dark Periwinkle #665FD1 ΔE 0.044
- Light Indigo #6D5ACF ΔE 0.044
- French Blue #436BAD ΔE 0.058
- Deep Lavender #8D5EB7 ΔE 0.069
- Dusky Blue #475F94 ΔE 0.069
- Bluey Purple #6241C7 ΔE 0.070
Use #645CB5 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.