#665CD1
Closest named color: Dark Periwinkle (#665FD1). oklch(54.7% 0.174 282.8), rgb(102, 92, 209).
Aa
White text reads best on this color (5.22:1).
About this color
#665CD1 is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.174 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.007 away. White text reads best on it, at 5.22:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.01:1 |
| White text | 5.22:1 |
Values
| HEX | #665CD1 |
| RGB | rgb(102, 92, 209) |
| HSL | hsl(245, 56%, 59%) |
| OKLCH | oklch(54.7% 0.174 282.8) |
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 #665CD1 | 5.22:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #665CD1 | 4.01:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #665CD1 text on white | 5.22:1 | AA | Lc 75.6 | Fine for body text |
| #665CD1 text on black | 4.01:1 | AA large text | Lc -26.1 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8F9
oklch(93.5% 0.023 283.3)
-
Step 200
200
#D4D6F6
oklch(88.5% 0.044 282.6)
-
Step 300
300
#B9BBF2
oklch(81% 0.077 282.9)
-
Step 400
400
#9695EC
oklch(70.6% 0.126 283.2)
-
Step 500
500
#7E79E6
oklch(63.2% 0.16 282.9)
-
Step 600
600 (this color)
#665CD1
oklch(54.7% 0.174 282.8)
-
Step 700
700
#574EB8
oklch(49.2% 0.162 282.5)
-
Step 800
800
#474095
oklch(42.7% 0.135 282.8)
-
Step 900
900
#3B3777
oklch(37.6% 0.106 282.9)
-
Step 950
950
#222145
oklch(26.9% 0.066 282.3)
#665CD1 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) | #0770D5 | 0.086 |
| Deuteranopia (no green cones) | #0068CF | 0.085 |
| Tritanopia (no blue cones) | #3C778D | 0.150 |
| Achromatopsia (no color) | #6C6C6C | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665CD1
#665CD1
oklch(54.7% 0.174 282.8)
- #7D7200
#7D7200
oklch(54.5% 0.114 102.8)
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 #665CD1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.007
- Slate Blue #6A5ACD ΔE 0.009
- Light Indigo #6D5ACF ΔE 0.012
- Iris #6258C4 ΔE 0.023
- Warm Blue #4B57DB ΔE 0.044
- Royal Blue #4169E1 ΔE 0.055
- Purpley #8756E4 ΔE 0.061
- Bluey Purple #6241C7 ΔE 0.061
Use #665CD1 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.