#646CF6
Closest named color: Cornflower (#6A79F7). oklch(60% 0.203 275.9), rgb(100, 108, 246).
Aa
Black text reads best on this color (5.01:1).
About this color
#646CF6 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.203 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.033 away. Black text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.01:1 |
| White text | 4.18:1 |
Values
| HEX | #646CF6 |
| RGB | rgb(100, 108, 246) |
| HSL | hsl(237, 89%, 68%) |
| OKLCH | oklch(60% 0.203 275.9) |
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 #646CF6 | 4.18:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #646CF6 | 5.01:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #646CF6 text on white | 4.18:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #646CF6 text on black | 5.01:1 | AA | Lc -33.2 | 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 500.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CFD7FE
oklch(88.6% 0.054 276.1)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500 (this color)
#646CF6
oklch(60% 0.203 275.9)
-
Step 600
600
#5759F0
oklch(55.5% 0.221 275.9)
-
Step 700
700
#4848D1
oklch(49.1% 0.205 275.8)
-
Step 800
800
#3B3CA9
oklch(42.7% 0.17 276)
-
Step 900
900
#313586
oklch(37.6% 0.133 275.8)
-
Step 950
950
#1D204E
oklch(27% 0.083 276.5)
#646CF6 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) | #0082FB | 0.075 |
| Deuteranopia (no green cones) | #0076F3 | 0.069 |
| Tritanopia (no blue cones) | #008DA7 | 0.174 |
| Achromatopsia (no color) | #7C7C7C | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646CF6
#646CF6
oklch(60% 0.203 275.9)
- #977F00
#977F00
oklch(60.1% 0.124 95.7)
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 #646CF6, closest first.
No curated palette has a color within ΔE 0.04 of #646CF6.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.033
- Medium Slate Blue #7B68EE ΔE 0.035
- Neon Blue #4361EE ΔE 0.052
- Royal Blue #4169E1 ΔE 0.054
- Clear Blue #247AFD ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.062
- Light Indigo #6D5ACF ΔE 0.070
- Purpley #8756E4 ΔE 0.071
Use #646CF6 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.