#665EB5
Closest named color: Iris (#6258C4). oklch(53.1% 0.133 285.1), rgb(102, 94, 181).
Aa
White text reads best on this color (5.47:1).
About this color
#665EB5 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 53%, its chroma 0.133 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.030 away. White text reads best on it, at 5.47:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #665EB5 |
| RGB | rgb(102, 94, 181) |
| HSL | hsl(246, 37%, 54%) |
| OKLCH | oklch(53.1% 0.133 285.1) |
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 #665EB5 | 5.47:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #665EB5 | 3.83:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #665EB5 text on white | 5.47:1 | AA | Lc 77.2 | Fine for body text |
| #665EB5 text on black | 3.83:1 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E8E8F5
oklch(93.5% 0.017 286.1)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BCBCE6
oklch(80.9% 0.059 285)
-
Step 400
400
#9A98DA
oklch(70.6% 0.096 285.1)
-
Step 500
500
#837DD0
oklch(63% 0.123 285.6)
-
Step 600
600 (this color)
#665EB5
oklch(53.1% 0.133 285.1)
-
Step 700
700
#5B54A3
oklch(49.2% 0.123 284.9)
-
Step 800
800
#4A4584
oklch(42.7% 0.102 284.8)
-
Step 900
900
#3E3A6A
oklch(37.6% 0.081 285.6)
-
Step 950
950
#24223E
oklch(26.9% 0.051 285.7)
#665EB5 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) | #3B6CB8 | 0.060 |
| Deuteranopia (no green cones) | #3867B3 | 0.060 |
| Tritanopia (no blue cones) | #4E7081 | 0.113 |
| Achromatopsia (no color) | #696969 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665EB5
#665EB5
oklch(53.1% 0.133 285.1)
- #766F00
#766F00
oklch(53.1% 0.113 105.3)
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 #665EB5, closest first.
No curated palette has a color within ΔE 0.04 of #665EB5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.040
- Dark Periwinkle #665FD1 ΔE 0.043
- Light Indigo #6D5ACF ΔE 0.044
- French Blue #436BAD ΔE 0.057
- Deep Lavender #8D5EB7 ΔE 0.065
- Dusky Blue #475F94 ΔE 0.070
- Mid Blue #276AB3 ΔE 0.074
Use #665EB5 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.