#665FB5
Closest named color: Iris (#6258C4). oklch(53.3% 0.131 284.7), rgb(102, 95, 181).
Aa
White text reads best on this color (5.42:1).
About this color
#665FB5 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 53%, its chroma 0.131 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.032 away. White text reads best on it, at 5.42:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.86:1 |
| White text | 5.42:1 |
Values
| HEX | #665FB5 |
| RGB | rgb(102, 95, 181) |
| HSL | hsl(245, 37%, 54%) |
| OKLCH | oklch(53.3% 0.131 284.7) |
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 #665FB5 | 5.42:1 | AA | Lc -82.2 | Fine for body text |
| Black text on #665FB5 | 3.86:1 | AA large text | Lc 27.2 | Dividers and decoration only |
| #665FB5 text on white | 5.42:1 | AA | Lc 76.9 | Fine for body text |
| #665FB5 text on black | 3.86:1 | AA large text | Lc -24.8 | 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
#E8E9F5
oklch(93.7% 0.016 282.3)
-
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
#827ECF
oklch(63.1% 0.12 284.7)
-
Step 600
600 (this color)
#665FB5
oklch(53.3% 0.131 284.7)
-
Step 700
700
#5B54A2
oklch(49.1% 0.122 285.1)
-
Step 800
800
#4A4584
oklch(42.7% 0.102 284.8)
-
Step 900
900
#3D3B6A
oklch(37.8% 0.079 283.9)
-
Step 950
950
#24233E
oklch(27.1% 0.05 284.3)
#665FB5 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) | #3D6CB8 | 0.057 |
| Deuteranopia (no green cones) | #3A67B3 | 0.057 |
| Tritanopia (no blue cones) | #4E7181 | 0.113 |
| Achromatopsia (no color) | #6A6A6A | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665FB5
#665FB5
oklch(53.3% 0.131 284.7)
- #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 #665FB5, closest first.
No curated palette has a color within ΔE 0.04 of #665FB5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.032
- Slate Blue #6A5ACD ΔE 0.041
- Dark Periwinkle #665FD1 ΔE 0.044
- Light Indigo #6D5ACF ΔE 0.045
- French Blue #436BAD ΔE 0.055
- Deep Lavender #8D5EB7 ΔE 0.064
- Dusky Blue #475F94 ΔE 0.070
- Mid Blue #276AB3 ΔE 0.073
Use #665FB5 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.