#665BC8
Closest named color: Slate Blue (#6A5ACD). oklch(53.9% 0.164 284), rgb(102, 91, 200).
Aa
White text reads best on this color (5.39:1).
About this color
#665BC8 is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.164 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Blue (#6A5ACD), ΔE 0.010 away. White text reads best on it, at 5.39:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Slate Blue (#6A5ACD) |
| Black text | 3.89:1 |
| White text | 5.39:1 |
Values
| HEX | #665BC8 |
| RGB | rgb(102, 91, 200) |
| HSL | hsl(246, 50%, 57%) |
| OKLCH | oklch(53.9% 0.164 284) |
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 #665BC8 | 5.39:1 | AA | Lc -81.9 | Fine for body text |
| Black text on #665BC8 | 3.89:1 | AA large text | Lc 27.5 | Dividers and decoration only |
| #665BC8 text on white | 5.39:1 | AA | Lc 76.6 | Fine for body text |
| #665BC8 text on black | 3.89:1 | AA large text | Lc -25.2 | 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
#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
#BABBEF
oklch(80.9% 0.073 283.8)
-
Step 400
400
#9896E7
oklch(70.7% 0.117 284.1)
-
Step 500
500
#807AE0
oklch(63.1% 0.15 283.9)
-
Step 600
600 (this color)
#665BC8
oklch(53.9% 0.164 284)
-
Step 700
700
#594FB2
oklch(49.1% 0.152 283.9)
-
Step 800
800
#494190
oklch(42.6% 0.126 284.3)
-
Step 900
900
#3C3873
oklch(37.6% 0.098 283.7)
-
Step 950
950
#232143
oklch(26.9% 0.062 284.1)
#665BC8 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) | #1D6ECC | 0.081 |
| Deuteranopia (no green cones) | #1467C6 | 0.082 |
| Tritanopia (no blue cones) | #437389 | 0.138 |
| Achromatopsia (no color) | #6A6A6A | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BC8
#665BC8
oklch(53.9% 0.164 284)
- #7A7100
#7A7100
oklch(54% 0.114 104)
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 #665BC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Blue #6A5ACD ΔE 0.010
- Iris #6258C4 ΔE 0.012
- Light Indigo #6D5ACF ΔE 0.016
- Dark Periwinkle #665FD1 ΔE 0.016
- Warm Blue #4B57DB ΔE 0.050
- Bluey Purple #6241C7 ΔE 0.058
- Royal Blue #4169E1 ΔE 0.063
- Purpley #8756E4 ΔE 0.069
Use #665BC8 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.