#6661FC
Closest named color: Medium Slate Blue (#7B68EE). oklch(58.8% 0.223 278.4), rgb(102, 97, 252).
Aa
Black text reads best on this color (4.68:1).
About this color
#6661FC is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.223 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Slate Blue (#7B68EE), ΔE 0.043 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.223) |
| Temperature | cool |
| Nearest name | Medium Slate Blue (#7B68EE) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #6661FC |
| RGB | rgb(102, 97, 252) |
| HSL | hsl(242, 96%, 68%) |
| OKLCH | oklch(58.8% 0.223 278.4) |
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 #6661FC | 4.48:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #6661FC | 4.68:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #6661FC text on white | 4.48:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #6661FC text on black | 4.68:1 | AA | Lc -31.1 | Non-text elements, placeholder text |
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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FE
oklch(93.5% 0.03 279.6)
-
Step 200
200
#D0D6FE
oklch(88.4% 0.055 278.5)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8C94FF
oklch(70.7% 0.155 278.4)
-
Step 500
500
#7374FF
oklch(63.1% 0.202 278.6)
-
Step 600
600 (this color)
#6661FC
oklch(58.8% 0.223 278.4)
-
Step 700
700
#4E45D2
oklch(49.1% 0.208 278.3)
-
Step 800
800
#403AA9
oklch(42.7% 0.171 278.7)
-
Step 900
900
#353486
oklch(37.7% 0.134 278.4)
-
Step 950
950
#1F1F4F
oklch(27% 0.086 279)
#6661FC 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) | #007DFF | 0.085 |
| Deuteranopia (no green cones) | #0071F9 | 0.077 |
| Tritanopia (no blue cones) | #0088A6 | 0.190 |
| Achromatopsia (no color) | #777777 | 0.224 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6661FC
#6661FC
oklch(58.8% 0.223 278.4)
- #907C00
#907C00
oklch(58.7% 0.121 97.8)
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 #6661FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Slate Blue #7B68EE ΔE 0.043
- Neon Blue #4361EE ΔE 0.049
- Cornflower #6A79F7 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.062
- Purpley #8756E4 ΔE 0.065
- Dark Periwinkle #665FD1 ΔE 0.065
- Warm Blue #4B57DB ΔE 0.068
- Light Indigo #6D5ACF ΔE 0.070
Use #6661FC 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.