#6166E9
Closest named color: Dark Periwinkle (#665FD1). oklch(57.8% 0.194 276.8), rgb(97, 102, 233).
Aa
Black text reads best on this color (4.58:1).
About this color
#6166E9 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.194 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.039 away. Black text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.194) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.58:1 |
| White text | 4.57:1 |
Values
| HEX | #6166E9 |
| RGB | rgb(97, 102, 233) |
| HSL | hsl(238, 76%, 65%) |
| OKLCH | oklch(57.8% 0.194 276.8) |
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 #6166E9 | 4.57:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #6166E9 | 4.58:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #6166E9 text on white | 4.57:1 | AA | Lc 71.4 | Content text, not long reading |
| #6166E9 text on black | 4.58:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7FA
oklch(88.5% 0.049 276.4)
-
Step 300
300
#B2BCF9
oklch(80.9% 0.087 277.1)
-
Step 400
400
#8B97F6
oklch(70.7% 0.139 276.8)
-
Step 500
500
#717AF3
oklch(63.2% 0.178 276.8)
-
Step 600
600 (this color)
#6166E9
oklch(57.8% 0.194 276.8)
-
Step 700
700
#4C4DC4
oklch(49.1% 0.181 277)
-
Step 800
800
#3E409E
oklch(42.7% 0.149 277.1)
-
Step 900
900
#34387E
oklch(37.8% 0.116 276.8)
-
Step 950
950
#1E214A
oklch(27% 0.075 277)
#6166E9 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) | #007BED | 0.075 |
| Deuteranopia (no green cones) | #0070E6 | 0.070 |
| Tritanopia (no blue cones) | #00859E | 0.168 |
| Achromatopsia (no color) | #757575 | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6166E9
#6166E9
oklch(57.8% 0.194 276.8)
- #8E7900
#8E7900
oklch(57.8% 0.119 96.9)
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 #6166E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.039
- Medium Slate Blue #7B68EE ΔE 0.039
- Royal Blue #4169E1 ΔE 0.040
- Neon Blue #4361EE ΔE 0.041
- Light Indigo #6D5ACF ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.050
- Cornflower #6A79F7 ΔE 0.051
- Warm Blue #4B57DB ΔE 0.053
Use #6166E9 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.