#645BA7
Closest named color: Iris (#6258C4). oklch(51.5% 0.118 286.9), rgb(100, 91, 167).
Aa
White text reads best on this color (5.83:1).
About this color
#645BA7 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.118 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.048 away. White text reads best on it, at 5.83:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.59:1 |
| White text | 5.83:1 |
Values
| HEX | #645BA7 |
| RGB | rgb(100, 91, 167) |
| HSL | hsl(247, 30%, 51%) |
| OKLCH | oklch(51.5% 0.118 286.9) |
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 #645BA7 | 5.83:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #645BA7 | 3.59:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #645BA7 text on white | 5.83:1 | AA | Lc 79.1 | Fine for body text |
| #645BA7 text on black | 3.59:1 | AA large text | Lc -22.7 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E9E8F5
oklch(93.6% 0.017 289.6)
-
Step 200
200
#D7D6EE
oklch(88.4% 0.033 287.6)
-
Step 300
300
#BDBCE4
oklch(80.9% 0.056 286.2)
-
Step 400
400
#9C98D7
oklch(70.7% 0.091 286.7)
-
Step 500
500
#857ECC
oklch(63.2% 0.116 286.7)
-
Step 600
600
#6F66B9
oklch(55.7% 0.126 286.5)
-
Step 700
700 (this color)
#645BA7
oklch(51.5% 0.118 286.9)
-
Step 800
800
#4C4581
oklch(42.7% 0.097 286.9)
-
Step 900
900
#3F3A68
oklch(37.6% 0.077 287)
-
Step 950
950
#25223D
oklch(26.9% 0.05 287.7)
#645BA7 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) | #3F67AA | 0.054 |
| Deuteranopia (no green cones) | #3E63A5 | 0.053 |
| Tritanopia (no blue cones) | #516A79 | 0.099 |
| Achromatopsia (no color) | #656565 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645BA7
#645BA7
oklch(51.5% 0.118 286.9)
- #6F6B00
#6F6B00
oklch(51.5% 0.11 107.1)
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 #645BA7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.048
- Dusky Blue #475F94 ΔE 0.054
- French Blue #436BAD ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.061
- Twilight #4E518B ΔE 0.062
- Light Indigo #6D5ACF ΔE 0.065
- Dark Periwinkle #665FD1 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.067
Use #645BA7 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.