#665BB4
Closest named color: Iris (#6258C4). oklch(52.5% 0.136 286.4), rgb(102, 91, 180).
Aa
White text reads best on this color (5.64:1).
About this color
#665BB4 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 53%, its chroma 0.136 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.028 away. White text reads best on it, at 5.64:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.72:1 |
| White text | 5.64:1 |
Values
| HEX | #665BB4 |
| RGB | rgb(102, 91, 180) |
| HSL | hsl(247, 37%, 53%) |
| OKLCH | oklch(52.5% 0.136 286.4) |
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 #665BB4 | 5.64:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #665BB4 | 3.72:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #665BB4 text on white | 5.64:1 | AA | Lc 78.0 | Fine for body text |
| #665BB4 text on black | 3.72:1 | AA large text | Lc -23.7 | 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 600.
-
Step 50
50
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D7D6EF
oklch(88.5% 0.034 287.5)
-
Step 300
300
#BDBBE7
oklch(80.8% 0.062 287)
-
Step 400
400
#9C97DB
oklch(70.7% 0.098 287)
-
Step 500
500
#847DD1
oklch(63.2% 0.124 286.1)
-
Step 600
600 (this color)
#665BB4
oklch(52.5% 0.136 286.4)
-
Step 700
700
#5D53A4
oklch(49.2% 0.126 286.5)
-
Step 800
800
#4C4485
oklch(42.7% 0.105 286.7)
-
Step 900
900
#3F3A6A
oklch(37.7% 0.08 286.6)
-
Step 950
950
#25223E
oklch(27% 0.051 287.4)
#665BB4 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) | #366AB7 | 0.066 |
| Deuteranopia (no green cones) | #3465B2 | 0.065 |
| Tritanopia (no blue cones) | #4F6D7F | 0.114 |
| Achromatopsia (no color) | #676767 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BB4
#665BB4
oklch(52.5% 0.136 286.4)
- #736E00
#736E00
oklch(52.6% 0.112 106.5)
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 #665BB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.028
- Slate Blue #6A5ACD ΔE 0.040
- Light Indigo #6D5ACF ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.045
- French Blue #436BAD ΔE 0.061
- Deep Lavender #8D5EB7 ΔE 0.067
- Bluey Purple #6241C7 ΔE 0.069
- Dusky Blue #475F94 ΔE 0.071
Use #665BB4 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.