#645ACF
Closest named color: Slate Blue (#6A5ACD). oklch(54% 0.175 282.7), rgb(100, 90, 207).
Aa
White text reads best on this color (5.37:1).
About this color
#645ACF is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.175 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Blue (#6A5ACD), ΔE 0.010 away. White text reads best on it, at 5.37:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Slate Blue (#6A5ACD) |
| Black text | 3.90:1 |
| White text | 5.37:1 |
Values
| HEX | #645ACF |
| RGB | rgb(100, 90, 207) |
| HSL | hsl(245, 55%, 58%) |
| OKLCH | oklch(54% 0.175 282.7) |
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 #645ACF | 5.37:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #645ACF | 3.90:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #645ACF text on white | 5.37:1 | AA | Lc 76.5 | Fine for body text |
| #645ACF text on black | 3.90:1 | AA large text | Lc -25.3 | 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
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F6
oklch(88.5% 0.044 282.6)
-
Step 300
300
#B9BBF3
oklch(81% 0.079 282.9)
-
Step 400
400
#9696EC
oklch(70.8% 0.124 282.8)
-
Step 500
500
#7E79E6
oklch(63.2% 0.16 282.9)
-
Step 600
600 (this color)
#645ACF
oklch(54% 0.175 282.7)
-
Step 700
700
#574EB8
oklch(49.2% 0.162 282.5)
-
Step 800
800
#474095
oklch(42.7% 0.135 282.8)
-
Step 900
900
#3B3777
oklch(37.6% 0.106 282.9)
-
Step 950
950
#222145
oklch(26.9% 0.066 282.3)
#645ACF 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) | #006ED3 | 0.086 |
| Deuteranopia (no green cones) | #0066CD | 0.083 |
| Tritanopia (no blue cones) | #39758C | 0.149 |
| Achromatopsia (no color) | #6A6A6A | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645ACF
#645ACF
oklch(54% 0.175 282.7)
- #7C7100
#7C7100
oklch(54.2% 0.114 102.7)
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 #645ACF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Blue #6A5ACD ΔE 0.010
- Dark Periwinkle #665FD1 ΔE 0.013
- Light Indigo #6D5ACF ΔE 0.014
- Iris #6258C4 ΔE 0.018
- Warm Blue #4B57DB ΔE 0.041
- Bluey Purple #6241C7 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.057
- Neon Blue #4361EE ΔE 0.063
Use #645ACF 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.