#664FC4
Closest named color: Iris (#6258C4). oklch(51.5% 0.175 287.7), rgb(102, 79, 196).
Aa
White text reads best on this color (6.03:1).
About this color
#664FC4 is a medium-dark, vivid purple. In OKLCH its lightness is 52%, its chroma 0.175 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.021 away. White text reads best on it, at 6.03:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.48:1 |
| White text | 6.03:1 |
Values
| HEX | #664FC4 |
| RGB | rgb(102, 79, 196) |
| HSL | hsl(252, 50%, 54%) |
| OKLCH | oklch(51.5% 0.175 287.7) |
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 #664FC4 | 6.03:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #664FC4 | 3.48:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #664FC4 text on white | 6.03:1 | AA | Lc 79.8 | Fine for body text |
| #664FC4 text on black | 3.48:1 | AA large text | Lc -22.1 | 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 700.
-
Step 50
50
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D7D5F7
oklch(88.5% 0.047 288.1)
-
Step 300
300
#BDB9F5
oklch(81% 0.084 287.4)
-
Step 400
400
#9D92F0
oklch(70.8% 0.135 287.8)
-
Step 500
500
#8673EA
oklch(63% 0.173 287.7)
-
Step 600
600
#7259D9
oklch(55.7% 0.188 287.7)
-
Step 700
700 (this color)
#664FC4
oklch(51.5% 0.175 287.7)
-
Step 800
800
#4E3C98
oklch(42.8% 0.144 287.7)
-
Step 900
900
#403479
oklch(37.7% 0.113 287.7)
-
Step 950
950
#251F47
oklch(26.9% 0.072 287.4)
#664FC4 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) | #0065C8 | 0.096 |
| Deuteranopia (no green cones) | #0060C2 | 0.095 |
| Tritanopia (no blue cones) | #476A82 | 0.144 |
| Achromatopsia (no color) | #636363 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664FC4
#664FC4
oklch(51.5% 0.175 287.7)
- #6F6B00
#6F6B00
oklch(51.5% 0.11 107.1)
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 #664FC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.021
- Slate Blue #6A5ACD ΔE 0.029
- Bluey Purple #6241C7 ΔE 0.032
- Light Indigo #6D5ACF ΔE 0.033
- Dark Periwinkle #665FD1 ΔE 0.041
- Warm Blue #4B57DB ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.054
- Blurple #5539CC ΔE 0.058
Use #664FC4 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.