#646CF1
Closest named color: Medium Slate Blue (#7B68EE). oklch(59.7% 0.196 276.1), rgb(100, 108, 241).
Aa
Black text reads best on this color (4.95:1).
About this color
#646CF1 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.196 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Slate Blue (#7B68EE), ΔE 0.033 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Medium Slate Blue (#7B68EE) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #646CF1 |
| RGB | rgb(100, 108, 241) |
| HSL | hsl(237, 83%, 67%) |
| OKLCH | oklch(59.7% 0.196 276.1) |
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 #646CF1 | 4.23:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #646CF1 | 4.95:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #646CF1 text on white | 4.23:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #646CF1 text on black | 4.95:1 | AA | Lc -32.8 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CFD7FD
oklch(88.5% 0.053 275.9)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8896FF
oklch(70.8% 0.153 276)
-
Step 500
500 (this color)
#646CF1
oklch(59.7% 0.196 276.1)
-
Step 600
600
#585BEC
oklch(55.6% 0.213 276)
-
Step 700
700
#4949CE
oklch(49.1% 0.2 276.1)
-
Step 800
800
#3B3DA6
oklch(42.6% 0.165 276)
-
Step 900
900
#323684
oklch(37.7% 0.129 276.1)
-
Step 950
950
#1D204D
oklch(26.9% 0.082 276.5)
#646CF1 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) | #0081F6 | 0.075 |
| Deuteranopia (no green cones) | #0075EE | 0.070 |
| Tritanopia (no blue cones) | #008BA4 | 0.170 |
| Achromatopsia (no color) | #7B7B7B | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646CF1
#646CF1
oklch(59.7% 0.196 276.1)
- #957E00
#957E00
oklch(59.7% 0.123 96.2)
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 #646CF1, closest first.
No curated palette has a color within ΔE 0.04 of #646CF1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Slate Blue #7B68EE ΔE 0.033
- Cornflower #6A79F7 ΔE 0.034
- Royal Blue #4169E1 ΔE 0.050
- Neon Blue #4361EE ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.055
- Clear Blue #247AFD ΔE 0.062
- Light Indigo #6D5ACF ΔE 0.064
- Slate Blue #6A5ACD ΔE 0.066
Use #646CF1 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.