#668FF4
Closest named color: Cornflower Blue (#6495ED). oklch(66.7% 0.157 265.7), rgb(102, 143, 244).
Aa
Black text reads best on this color (6.80:1).
About this color
#668FF4 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.157 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.021 away. Black text reads best on it, at 6.80:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.80:1 |
| White text | 3.08:1 |
Values
| HEX | #668FF4 |
| RGB | rgb(102, 143, 244) |
| HSL | hsl(223, 87%, 68%) |
| OKLCH | oklch(66.7% 0.157 265.7) |
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 #668FF4 | 3.08:1 | AA large text | Lc -63.0 | Content text, not long reading |
| Black text on #668FF4 | 6.80:1 | AA | Lc 46.5 | Large or bold text, headings |
| #668FF4 text on white | 3.08:1 | AA large text | Lc 57.6 | Large or bold text, headings |
| #668FF4 text on black | 6.80:1 | AA | Lc -44.2 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#A9C0F3
oklch(80.8% 0.077 265.8)
-
Step 400
400
#7C9EED
oklch(70.7% 0.122 265.7)
-
Step 500
500 (this color)
#668FF4
oklch(66.7% 0.157 265.7)
-
Step 600
600
#436BD6
oklch(55.7% 0.171 265.7)
-
Step 700
700
#3558B9
oklch(49% 0.159 265.8)
-
Step 800
800
#2C4996
oklch(42.8% 0.131 265.6)
-
Step 900
900
#273E77
oklch(37.7% 0.101 265.3)
-
Step 950
950
#172546
oklch(27.1% 0.064 265.1)
#668FF4 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) | #639AF8 | 0.028 |
| Deuteranopia (no green cones) | #4F8DF2 | 0.025 |
| Tritanopia (no blue cones) | #00A5B6 | 0.137 |
| Achromatopsia (no color) | #939393 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668FF4
#668FF4
oklch(66.7% 0.157 265.7)
- #BA8D00
#BA8D00
oklch(66.8% 0.137 85.8)
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 #668FF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.021
- Soft Blue #6488EA ΔE 0.022
- Chefchaouen Blue #4895EF ΔE 0.032
- Dark Sky Blue #448EE4 ΔE 0.042
- Lavender Blue #8B88F8 ΔE 0.048
- Dodger Blue #1E90FF ΔE 0.052
- Perrywinkle #8F8CE7 ΔE 0.053
- Cornflower #6A79F7 ΔE 0.056
Use #668FF4 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.