#665AC6
Closest named color: Iris (#6258C4). oklch(53.5% 0.162 284.5), rgb(102, 90, 198).
Aa
White text reads best on this color (5.46:1).
About this color
#665AC6 is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.162 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.009 away. White text reads best on it, at 5.46:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.84:1 |
| White text | 5.46:1 |
Values
| HEX | #665AC6 |
| RGB | rgb(102, 90, 198) |
| HSL | hsl(247, 49%, 56%) |
| OKLCH | oklch(53.5% 0.162 284.5) |
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 #665AC6 | 5.46:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #665AC6 | 3.84:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #665AC6 text on white | 5.46:1 | AA | Lc 77.0 | Fine for body text |
| #665AC6 text on black | 3.84:1 | AA large text | Lc -24.8 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F8
oklch(93.6% 0.022 286)
-
Step 200
200
#D5D6F4
oklch(88.5% 0.041 284)
-
Step 300
300
#BBBBEF
oklch(81% 0.073 284.7)
-
Step 400
400
#9996E7
oklch(70.8% 0.117 284.7)
-
Step 500
500
#817ADF
oklch(63.2% 0.148 284.4)
-
Step 600
600 (this color)
#665AC6
oklch(53.5% 0.162 284.5)
-
Step 700
700
#5A4FB1
oklch(49.1% 0.15 284.5)
-
Step 800
800
#494190
oklch(42.6% 0.126 284.3)
-
Step 900
900
#3D3873
oklch(37.7% 0.098 284.5)
-
Step 950
950
#242143
oklch(27% 0.062 285.5)
#665AC6 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) | #1D6DCA | 0.081 |
| Deuteranopia (no green cones) | #1666C4 | 0.082 |
| Tritanopia (no blue cones) | #447287 | 0.138 |
| Achromatopsia (no color) | #696969 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665AC6
#665AC6
oklch(53.5% 0.162 284.5)
- #787000
#787000
oklch(53.5% 0.113 104.6)
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 #665AC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.009
- Slate Blue #6A5ACD ΔE 0.013
- Light Indigo #6D5ACF ΔE 0.018
- Dark Periwinkle #665FD1 ΔE 0.020
- Warm Blue #4B57DB ΔE 0.052
- Bluey Purple #6241C7 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.066
- Purpley #8756E4 ΔE 0.071
Use #665AC6 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.