#6658CC
Closest named color: Slate Blue (#6A5ACD). oklch(53.6% 0.173 284.4), rgb(102, 88, 204).
Aa
White text reads best on this color (5.47:1).
About this color
#6658CC is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.173 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Blue (#6A5ACD), ΔE 0.008 away. White text reads best on it, at 5.47:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Slate Blue (#6A5ACD) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #6658CC |
| RGB | rgb(102, 88, 204) |
| HSL | hsl(247, 53%, 57%) |
| OKLCH | oklch(53.6% 0.173 284.4) |
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 #6658CC | 5.47:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #6658CC | 3.83:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #6658CC text on white | 5.47:1 | AA | Lc 77.0 | Fine for body text |
| #6658CC text on black | 3.83:1 | AA large text | Lc -24.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D5D6F5
oklch(88.5% 0.042 284)
-
Step 300
300
#BABAF2
oklch(80.8% 0.079 284.5)
-
Step 400
400
#9895EB
oklch(70.7% 0.124 284.3)
-
Step 500
500
#8178E5
oklch(63.1% 0.159 284.6)
-
Step 600
600 (this color)
#6658CC
oklch(53.6% 0.173 284.4)
-
Step 700
700
#5A4DB7
oklch(49.2% 0.161 284.3)
-
Step 800
800
#494094
oklch(42.8% 0.133 284.1)
-
Step 900
900
#3D3776
oklch(37.7% 0.104 284.6)
-
Step 950
950
#232145
oklch(27% 0.065 283.6)
#6658CC 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) | #006DD0 | 0.090 |
| Deuteranopia (no green cones) | #0065CA | 0.088 |
| Tritanopia (no blue cones) | #407289 | 0.146 |
| Achromatopsia (no color) | #696969 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6658CC
#6658CC
oklch(53.6% 0.173 284.4)
- #787000
#787000
oklch(53.5% 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 #6658CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Blue #6A5ACD ΔE 0.008
- Light Indigo #6D5ACF ΔE 0.013
- Iris #6258C4 ΔE 0.014
- Dark Periwinkle #665FD1 ΔE 0.018
- Warm Blue #4B57DB ΔE 0.045
- Bluey Purple #6241C7 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.063
- Purpley #8756E4 ΔE 0.065
Use #6658CC 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.