#665BBB
Closest named color: Iris (#6258C4). oklch(53% 0.146 285.5), rgb(102, 91, 187).
Aa
White text reads best on this color (5.55:1).
About this color
#665BBB is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.146 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.018 away. White text reads best on it, at 5.55:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.77:1 |
| White text | 5.55:1 |
Values
| HEX | #665BBB |
| RGB | rgb(102, 91, 187) |
| HSL | hsl(247, 41%, 55%) |
| OKLCH | oklch(53% 0.146 285.5) |
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 #665BBB | 5.55:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #665BBB | 3.77:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #665BBB text on white | 5.55:1 | AA | Lc 77.6 | Fine for body text |
| #665BBB text on black | 3.77:1 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D6F1
oklch(88.4% 0.037 285.6)
-
Step 300
300
#BCBBEA
oklch(80.9% 0.066 285.8)
-
Step 400
400
#9A97DF
oklch(70.7% 0.104 285.3)
-
Step 500
500
#837CD6
oklch(63.2% 0.133 285.5)
-
Step 600
600 (this color)
#665BBB
oklch(53% 0.146 285.5)
-
Step 700
700
#5C51A9
oklch(49.1% 0.136 285.9)
-
Step 800
800
#4B4389
oklch(42.7% 0.112 285.8)
-
Step 900
900
#3E396E
oklch(37.7% 0.089 285.6)
-
Step 950
950
#242240
oklch(27% 0.055 285.1)
#665BBB 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) | #2F6BBE | 0.071 |
| Deuteranopia (no green cones) | #2C65B9 | 0.070 |
| Tritanopia (no blue cones) | #4B6F82 | 0.123 |
| Achromatopsia (no color) | #686868 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BBB
#665BBB
oklch(53% 0.146 285.5)
- #756F00
#756F00
oklch(53% 0.113 105.9)
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 #665BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.018
- Slate Blue #6A5ACD ΔE 0.029
- Light Indigo #6D5ACF ΔE 0.033
- Dark Periwinkle #665FD1 ΔE 0.034
- Bluey Purple #6241C7 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.065
- French Blue #436BAD ΔE 0.065
- Deep Lavender #8D5EB7 ΔE 0.067
Use #665BBB 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.