#646FFB
Closest named color: Cornflower (#6A79F7). oklch(60.9% 0.206 275.1), rgb(100, 111, 251).
Aa
Black text reads best on this color (5.20:1).
About this color
#646FFB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.206 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.027 away. Black text reads best on it, at 5.20:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.206) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.20:1 |
| White text | 4.03:1 |
Values
| HEX | #646FFB |
| RGB | rgb(100, 111, 251) |
| HSL | hsl(236, 95%, 69%) |
| OKLCH | oklch(60.9% 0.206 275.1) |
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 #646FFB | 4.03:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #646FFB | 5.20:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #646FFB text on white | 4.03:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #646FFB text on black | 5.20:1 | AA | Lc -34.5 | 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
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8696FF
oklch(70.7% 0.154 275.2)
-
Step 500
500 (this color)
#646FFB
oklch(60.9% 0.206 275.1)
-
Step 600
600
#5559F2
oklch(55.5% 0.224 275.2)
-
Step 700
700
#4648D3
oklch(49.1% 0.208 275)
-
Step 800
800
#393CAA
oklch(42.6% 0.172 275.1)
-
Step 900
900
#303587
oklch(37.6% 0.135 275.2)
-
Step 950
950
#1C204F
oklch(27% 0.085 275.5)
#646FFB 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) | #0085FF | 0.074 |
| Deuteranopia (no green cones) | #0078F8 | 0.067 |
| Tritanopia (no blue cones) | #0090AA | 0.176 |
| Achromatopsia (no color) | #7F7F7F | 0.206 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646FFB
#646FFB
oklch(60.9% 0.206 275.1)
- #9B8100
#9B8100
oklch(61% 0.125 94.7)
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 #646FFB, closest first.
No curated palette has a color within ΔE 0.04 of #646FFB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.027
- Medium Slate Blue #7B68EE ΔE 0.038
- Clear Blue #247AFD ΔE 0.057
- Neon Blue #4361EE ΔE 0.058
- Royal Blue #4169E1 ΔE 0.060
- Soft Blue #6488EA ΔE 0.070
- Dark Periwinkle #665FD1 ΔE 0.071
- Cerulean Blue #056EEE ΔE 0.075
Use #646FFB 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.