#664FBA
Closest named color: Iris (#6258C4). oklch(50.8% 0.162 289.2), rgb(102, 79, 186).
Aa
White text reads best on this color (6.19:1).
About this color
#664FBA is a medium-dark, vivid purple. In OKLCH its lightness is 51%, its chroma 0.162 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.025 away. White text reads best on it, at 6.19:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.39:1 |
| White text | 6.19:1 |
Values
| HEX | #664FBA |
| RGB | rgb(102, 79, 186) |
| HSL | hsl(253, 44%, 52%) |
| OKLCH | oklch(50.8% 0.162 289.2) |
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 #664FBA | 6.19:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #664FBA | 3.39:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #664FBA text on white | 6.19:1 | AA | Lc 80.5 | Fine for body text |
| #664FBA text on black | 3.39:1 | AA large text | Lc -21.3 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F9
oklch(93.7% 0.023 288.7)
-
Step 200
200
#D8D5F5
oklch(88.5% 0.044 289.8)
-
Step 300
300
#BFB9F1
oklch(81% 0.079 289.4)
-
Step 400
400
#9F93E9
oklch(70.8% 0.124 289.2)
-
Step 500
500
#8975E3
oklch(63.1% 0.161 289.3)
-
Step 600
600
#745BD0
oklch(55.6% 0.173 289.4)
-
Step 700
700 (this color)
#664FBA
oklch(50.8% 0.162 289.2)
-
Step 800
800
#4F3D92
oklch(42.6% 0.134 289.2)
-
Step 900
900
#413574
oklch(37.6% 0.104 289.2)
-
Step 950
950
#262044
oklch(27% 0.065 288.9)
#664FBA 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) | #0663BE | 0.096 |
| Deuteranopia (no green cones) | #0D5EB8 | 0.094 |
| Tritanopia (no blue cones) | #4C677D | 0.133 |
| Achromatopsia (no color) | #616161 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664FBA
#664FBA
oklch(50.8% 0.162 289.2)
- #6B6A00
#6B6A00
oklch(50.8% 0.11 109.1)
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 #664FBA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.025
- Bluey Purple #6241C7 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.039
- Light Indigo #6D5ACF ΔE 0.042
- Dark Periwinkle #665FD1 ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blurple #5539CC ΔE 0.064
- Warm Blue #4B57DB ΔE 0.065
Use #664FBA 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.