#665FF8
Closest named color: Medium Slate Blue (#7B68EE). oklch(58.1% 0.221 279), rgb(102, 95, 248).
Aa
White text reads best on this color (4.60:1).
About this color
#665FF8 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.221 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Slate Blue (#7B68EE), ΔE 0.043 away. White text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.221) |
| Temperature | cool |
| Nearest name | Medium Slate Blue (#7B68EE) |
| Black text | 4.55:1 |
| White text | 4.60:1 |
Values
| HEX | #665FF8 |
| RGB | rgb(102, 95, 248) |
| HSL | hsl(243, 92%, 67%) |
| OKLCH | oklch(58.1% 0.221 279) |
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 #665FF8 | 4.60:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #665FF8 | 4.55:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #665FF8 text on white | 4.60:1 | AA | Lc 71.5 | Content text, not long reading |
| #665FF8 text on black | 4.55:1 | AA | Lc -30.2 | 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
#E5E8FD
oklch(93.5% 0.029 279.4)
-
Step 200
200
#D1D6FE
oklch(88.5% 0.055 279.6)
-
Step 300
300
#B3BAFF
oklch(80.8% 0.098 279.5)
-
Step 400
400
#8D94FF
oklch(70.8% 0.155 278.8)
-
Step 500
500
#7474FF
oklch(63.2% 0.201 278.9)
-
Step 600
600 (this color)
#665FF8
oklch(58.1% 0.221 279)
-
Step 700
700
#5045D0
oklch(49.1% 0.205 279.2)
-
Step 800
800
#413AA8
oklch(42.7% 0.17 279.2)
-
Step 900
900
#363485
oklch(37.7% 0.132 279.1)
-
Step 950
950
#1F1F4E
oklch(26.9% 0.084 279.1)
#665FF8 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) | #007BFD | 0.086 |
| Deuteranopia (no green cones) | #006FF5 | 0.078 |
| Tritanopia (no blue cones) | #0085A3 | 0.188 |
| Achromatopsia (no color) | #757575 | 0.222 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665FF8
#665FF8
oklch(58.1% 0.221 279)
- #8D7B00
#8D7B00
oklch(58.2% 0.121 99)
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 #665FF8, 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 0.046
- Dark Periwinkle #665FD1 ΔE 0.059
- Royal Blue #4169E1 ΔE 0.059
- Cornflower #6A79F7 ΔE 0.060
- Purpley #8756E4 ΔE 0.061
- Warm Blue #4B57DB ΔE 0.062
- Light Indigo #6D5ACF ΔE 0.063
Use #665FF8 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.