#645BB8
Closest named color: Iris (#6258C4). oklch(52.6% 0.142 284.8), rgb(100, 91, 184).
Aa
White text reads best on this color (5.62:1).
About this color
#645BB8 is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.142 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.021 away. White text reads best on it, at 5.62:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #645BB8 |
| RGB | rgb(100, 91, 184) |
| HSL | hsl(246, 40%, 54%) |
| OKLCH | oklch(52.6% 0.142 284.8) |
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 #645BB8 | 5.62:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #645BB8 | 3.73:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #645BB8 text on white | 5.62:1 | AA | Lc 77.9 | Fine for body text |
| #645BB8 text on black | 3.73:1 | AA large text | Lc -23.8 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D6F0
oklch(88.4% 0.036 285.7)
-
Step 300
300
#BBBCE9
oklch(81% 0.063 283.9)
-
Step 400
400
#9A98DE
oklch(70.8% 0.101 284.8)
-
Step 500
500
#827CD5
oklch(63% 0.132 285)
-
Step 600
600 (this color)
#645BB8
oklch(52.6% 0.142 284.8)
-
Step 700
700
#5B52A7
oklch(49% 0.132 285.3)
-
Step 800
800
#4A4488
oklch(42.8% 0.11 284.8)
-
Step 900
900
#3D3A6D
oklch(37.7% 0.085 284.2)
-
Step 950
950
#242240
oklch(27% 0.055 285.1)
#645BB8 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) | #326ABB | 0.066 |
| Deuteranopia (no green cones) | #2E64B6 | 0.066 |
| Tritanopia (no blue cones) | #496F81 | 0.120 |
| Achromatopsia (no color) | #676767 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645BB8
#645BB8
oklch(52.6% 0.142 284.8)
- #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 #645BB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.021
- Slate Blue #6A5ACD ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.039
- Dark Periwinkle #665FD1 ΔE 0.039
- French Blue #436BAD ΔE 0.062
- Bluey Purple #6241C7 ΔE 0.065
- Warm Blue #4B57DB ΔE 0.067
- Deep Lavender #8D5EB7 ΔE 0.070
Use #645BB8 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.