#665BC0
Closest named color: Iris (#6258C4). oklch(53.3% 0.153 284.9), rgb(102, 91, 192).
Aa
White text reads best on this color (5.49:1).
About this color
#665BC0 is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.153 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.012 away. White text reads best on it, at 5.49:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.82:1 |
| White text | 5.49:1 |
Values
| HEX | #665BC0 |
| RGB | rgb(102, 91, 192) |
| HSL | hsl(247, 44%, 55%) |
| OKLCH | oklch(53.3% 0.153 284.9) |
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 #665BC0 | 5.49:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #665BC0 | 3.82:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #665BC0 text on white | 5.49:1 | AA | Lc 77.2 | Fine for body text |
| #665BC0 text on black | 3.82:1 | AA large text | Lc -24.6 | 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
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D6D6F2
oklch(88.5% 0.038 285.6)
-
Step 300
300
#BBBBEC
oklch(80.9% 0.069 284.8)
-
Step 400
400
#9997E2
oklch(70.7% 0.109 284.5)
-
Step 500
500
#827BDA
oklch(63.1% 0.14 285)
-
Step 600
600 (this color)
#665BC0
oklch(53.3% 0.153 284.9)
-
Step 700
700
#5B50AD
oklch(49.1% 0.143 285.2)
-
Step 800
800
#4A428C
oklch(42.6% 0.119 285.1)
-
Step 900
900
#3D3970
oklch(37.7% 0.092 284.4)
-
Step 950
950
#242241
oklch(27.1% 0.057 284.9)
#665BC0 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) | #296CC4 | 0.074 |
| Deuteranopia (no green cones) | #2566BE | 0.074 |
| Tritanopia (no blue cones) | #487185 | 0.129 |
| Achromatopsia (no color) | #696969 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BC0
#665BC0
oklch(53.3% 0.153 284.9)
- #776F00
#776F00
oklch(53.2% 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 #665BC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.012
- Slate Blue #6A5ACD ΔE 0.021
- Light Indigo #6D5ACF ΔE 0.026
- Dark Periwinkle #665FD1 ΔE 0.027
- Warm Blue #4B57DB ΔE 0.059
- Bluey Purple #6241C7 ΔE 0.061
- Deep Lavender #8D5EB7 ΔE 0.068
- French Blue #436BAD ΔE 0.069
Use #665BC0 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.