#664FAB
Closest named color: Iris (#6258C4). oklch(49.7% 0.142 292), rgb(102, 79, 171).
Aa
White text reads best on this color (6.41:1).
About this color
#664FAB is a medium-dark, vivid purple. In OKLCH its lightness is 50%, its chroma 0.142 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.043 away. White text reads best on it, at 6.41:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #664FAB |
| RGB | rgb(102, 79, 171) |
| HSL | hsl(255, 37%, 49%) |
| OKLCH | oklch(49.7% 0.142 292) |
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 #664FAB | 6.41:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #664FAB | 3.27:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #664FAB text on white | 6.41:1 | AA | Lc 81.6 | Fine for body text |
| #664FAB text on black | 3.27:1 | AA large text | Lc -20.2 | 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 700.
-
Step 50
50
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#D9D5F1
oklch(88.5% 0.038 292.2)
-
Step 300
300
#C1B9EA
oklch(80.9% 0.069 292.3)
-
Step 400
400
#A294DF
oklch(70.8% 0.109 291.9)
-
Step 500
500
#8C77D6
oklch(63% 0.14 292.1)
-
Step 600
600
#775EC4
oklch(55.6% 0.153 292)
-
Step 700
700 (this color)
#664FAB
oklch(49.7% 0.142 292)
-
Step 800
800
#524089
oklch(42.8% 0.117 292.1)
-
Step 900
900
#43376D
oklch(37.7% 0.09 291.7)
-
Step 950
950
#272040
oklch(26.9% 0.058 292.1)
#664FAB 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) | #2660AE | 0.084 |
| Deuteranopia (no green cones) | #2A5DA9 | 0.081 |
| Tritanopia (no blue cones) | #546275 | 0.115 |
| Achromatopsia (no color) | #5F5F5F | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664FAB
#664FAB
oklch(49.7% 0.142 292)
- #656800
#656800
oklch(49.8% 0.11 111.7)
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 #664FAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.043
- Bluey Purple #6241C7 ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.058
- Light Indigo #6D5ACF ΔE 0.061
- Twilight #4E518B ΔE 0.066
- Rebecca Purple #663399 ΔE 0.067
- Dark Periwinkle #665FD1 ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
Use #664FAB 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.