#645CBA
Closest named color: Iris (#6258C4). oklch(52.9% 0.143 284.2), rgb(100, 92, 186).
Aa
White text reads best on this color (5.55:1).
About this color
#645CBA is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.143 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.020 away. White text reads best on it, at 5.55:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.78:1 |
| White text | 5.55:1 |
Values
| HEX | #645CBA |
| RGB | rgb(100, 92, 186) |
| HSL | hsl(245, 41%, 55%) |
| OKLCH | oklch(52.9% 0.143 284.2) |
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 #645CBA | 5.55:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #645CBA | 3.78:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #645CBA text on white | 5.55:1 | AA | Lc 77.5 | Fine for body text |
| #645CBA text on black | 3.78:1 | AA large text | Lc -24.2 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D6F1
oklch(88.4% 0.037 285.6)
-
Step 300
300
#BBBCE9
oklch(81% 0.063 283.9)
-
Step 400
400
#9998DF
oklch(70.8% 0.103 284.1)
-
Step 500
500
#817DD6
oklch(63.2% 0.132 284)
-
Step 600
600 (this color)
#645CBA
oklch(52.9% 0.143 284.2)
-
Step 700
700
#5A52A8
oklch(49% 0.133 284.6)
-
Step 800
800
#494488
oklch(42.7% 0.11 284.1)
-
Step 900
900
#3D3A6D
oklch(37.7% 0.085 284.2)
-
Step 950
950
#242240
oklch(27% 0.055 285.1)
#645CBA 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) | #326BBD | 0.065 |
| Deuteranopia (no green cones) | #2E65B8 | 0.065 |
| Tritanopia (no blue cones) | #487082 | 0.122 |
| Achromatopsia (no color) | #686868 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645CBA
#645CBA
oklch(52.9% 0.143 284.2)
- #766E00
#766E00
oklch(52.9% 0.112 104.6)
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 #645CBA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.020
- Slate Blue #6A5ACD ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.036
- French Blue #436BAD ΔE 0.061
- Warm Blue #4B57DB ΔE 0.065
- Bluey Purple #6241C7 ΔE 0.066
- Deep Lavender #8D5EB7 ΔE 0.069
Use #645CBA 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.