#646AFA
Closest named color: Medium Slate Blue (#7B68EE). oklch(60% 0.211 276.2), rgb(100, 106, 250).
Aa
Black text reads best on this color (4.98:1).
About this color
#646AFA is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.211 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Slate Blue (#7B68EE), ΔE 0.037 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.211) |
| Temperature | cool |
| Nearest name | Medium Slate Blue (#7B68EE) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #646AFA |
| RGB | rgb(100, 106, 250) |
| HSL | hsl(238, 94%, 69%) |
| OKLCH | oklch(60% 0.211 276.2) |
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 #646AFA | 4.21:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #646AFA | 4.98:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #646AFA text on white | 4.21:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #646AFA text on black | 4.98:1 | AA | Lc -33.0 | 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
#CFD7FF
oklch(88.6% 0.056 276.3)
-
Step 300
300
#B0BCFF
oklch(81% 0.096 276.2)
-
Step 400
400
#8895FF
oklch(70.6% 0.155 276.4)
-
Step 500
500 (this color)
#646AFA
oklch(60% 0.211 276.2)
-
Step 600
600
#5857F5
oklch(55.6% 0.229 276.2)
-
Step 700
700
#4945D5
oklch(49% 0.213 276.3)
-
Step 800
800
#3B3AAC
oklch(42.6% 0.177 276.2)
-
Step 900
900
#313488
oklch(37.6% 0.137 276)
-
Step 950
950
#1D2050
oklch(27.2% 0.087 276.3)
#646AFA 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) | #0082FF | 0.077 |
| Deuteranopia (no green cones) | #0075F7 | 0.070 |
| Tritanopia (no blue cones) | #008DA8 | 0.180 |
| Achromatopsia (no color) | #7B7B7B | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646AFA
#646AFA
oklch(60% 0.211 276.2)
- #967F00
#967F00
oklch(60% 0.123 96.3)
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 #646AFA, closest first.
No curated palette has a color within ΔE 0.04 of #646AFA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Slate Blue #7B68EE ΔE 0.037
- Cornflower #6A79F7 ΔE 0.038
- Neon Blue #4361EE ΔE 0.051
- Royal Blue #4169E1 ΔE 0.057
- Clear Blue #247AFD ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.065
- Purpley #8756E4 ΔE 0.071
- Light Indigo #6D5ACF ΔE 0.073
Use #646AFA 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.