#665EC5
Closest named color: Iris (#6258C4). oklch(54.2% 0.155 283.4), rgb(102, 94, 197).
Aa
White text reads best on this color (5.28:1).
About this color
#665EC5 is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.155 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.017 away. White text reads best on it, at 5.28:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #665EC5 |
| RGB | rgb(102, 94, 197) |
| HSL | hsl(245, 47%, 57%) |
| OKLCH | oklch(54.2% 0.155 283.4) |
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 #665EC5 | 5.28:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #665EC5 | 3.97:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #665EC5 text on white | 5.28:1 | AA | Lc 76.0 | Fine for body text |
| #665EC5 text on black | 3.97:1 | AA large text | Lc -25.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D5D6F3
oklch(88.4% 0.04 284)
-
Step 300
300
#BABBED
oklch(80.8% 0.07 283.8)
-
Step 400
400
#9797E4
oklch(70.7% 0.112 283.2)
-
Step 500
500
#7F7BDC
oklch(63% 0.143 283.4)
-
Step 600
600 (this color)
#665EC5
oklch(54.2% 0.155 283.4)
-
Step 700
700
#5851AE
oklch(49.1% 0.144 283.1)
-
Step 800
800
#48438D
oklch(42.7% 0.119 283.2)
-
Step 900
900
#3C3971
oklch(37.7% 0.093 283.4)
-
Step 950
950
#232242
oklch(27.1% 0.058 283.2)
#665EC5 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) | #2B6FC9 | 0.072 |
| Deuteranopia (no green cones) | #2468C3 | 0.073 |
| Tritanopia (no blue cones) | #447488 | 0.132 |
| Achromatopsia (no color) | #6C6C6C | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665EC5
#665EC5
oklch(54.2% 0.155 283.4)
- #7B7100
#7B7100
oklch(54.1% 0.114 103.4)
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 #665EC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.017
- Slate Blue #6A5ACD ΔE 0.017
- Dark Periwinkle #665FD1 ΔE 0.018
- Light Indigo #6D5ACF ΔE 0.021
- Warm Blue #4B57DB ΔE 0.056
- Royal Blue #4169E1 ΔE 0.063
- Bluey Purple #6241C7 ΔE 0.066
- Deep Lavender #8D5EB7 ΔE 0.068
Use #665EC5 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.