#645BAC
Closest named color: Iris (#6258C4). oklch(51.8% 0.125 286.3), rgb(100, 91, 172).
Aa
White text reads best on this color (5.77:1).
About this color
#645BAC is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.125 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.040 away. White text reads best on it, at 5.77:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.63:1 |
| White text | 5.77:1 |
Values
| HEX | #645BAC |
| RGB | rgb(100, 91, 172) |
| HSL | hsl(247, 33%, 52%) |
| OKLCH | oklch(51.8% 0.125 286.3) |
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 #645BAC | 5.77:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #645BAC | 3.63:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #645BAC text on white | 5.77:1 | AA | Lc 78.8 | Fine for body text |
| #645BAC text on black | 3.63:1 | AA large text | Lc -23.0 | 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 700.
-
Step 50
50
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F5
oklch(93.5% 0.017 286.1)
-
Step 200
200
#D7D6EF
oklch(88.5% 0.034 287.5)
-
Step 300
300
#BDBCE7
oklch(81% 0.06 286)
-
Step 400
400
#9B98DA
oklch(70.7% 0.096 285.8)
-
Step 500
500
#847DD0
oklch(63.1% 0.123 286.2)
-
Step 600
600
#6E65BD
oklch(55.6% 0.133 285.9)
-
Step 700
700 (this color)
#645BAC
oklch(51.8% 0.125 286.3)
-
Step 800
800
#4B4484
oklch(42.6% 0.103 286.1)
-
Step 900
900
#3F3A6A
oklch(37.7% 0.08 286.6)
-
Step 950
950
#25223E
oklch(27% 0.051 287.4)
#645BAC 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) | #3C68AF | 0.057 |
| Deuteranopia (no green cones) | #3A63AA | 0.056 |
| Tritanopia (no blue cones) | #4F6B7B | 0.105 |
| Achromatopsia (no color) | #666666 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645BAC
#645BAC
oklch(51.8% 0.125 286.3)
- #716C00
#716C00
oklch(51.9% 0.111 106.5)
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 #645BAC, closest first.
No curated palette has a color within ΔE 0.04 of #645BAC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.040
- Slate Blue #6A5ACD ΔE 0.053
- French Blue #436BAD ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.058
- Dusky Blue #475F94 ΔE 0.059
- Twilight #4E518B ΔE 0.067
- Deep Lavender #8D5EB7 ΔE 0.072
Use #645BAC 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.