#668CCC
Closest named color: Faded Blue (#658CBB). oklch(63.9% 0.106 260.4), rgb(102, 140, 204).
Aa
Black text reads best on this color (6.18:1).
About this color
#668CCC is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.106 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.026 away. Black text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #668CCC |
| RGB | rgb(102, 140, 204) |
| HSL | hsl(218, 50%, 60%) |
| OKLCH | oklch(63.9% 0.106 260.4) |
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 #668CCC | 3.39:1 | AA large text | Lc -66.8 | Content text, not long reading |
| Black text on #668CCC | 6.18:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #668CCC text on white | 3.39:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #668CCC text on black | 6.18:1 | AA | Lc -40.4 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#AEC2E3
oklch(81% 0.052 260.4)
-
Step 400
400
#83A2D5
oklch(70.8% 0.083 260.2)
-
Step 500
500 (this color)
#668CCC
oklch(63.9% 0.106 260.4)
-
Step 600
600
#4B72B6
oklch(55.5% 0.115 260.9)
-
Step 700
700
#3C609D
oklch(49.2% 0.107 260.4)
-
Step 800
800
#324E7F
oklch(42.6% 0.089 260.9)
-
Step 900
900
#2C4166
oklch(37.6% 0.069 261.2)
-
Step 950
950
#1A263C
oklch(26.9% 0.045 261.9)
#668CCC 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) | #7391CF | 0.022 |
| Deuteranopia (no green cones) | #6787CB | 0.013 |
| Tritanopia (no blue cones) | #379AA3 | 0.094 |
| Achromatopsia (no color) | #8B8B8B | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668CCC
#668CCC
oklch(63.9% 0.106 260.4)
- #AD8438
#AD8438
oklch(63.8% 0.106 80.2)
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 #668CCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.026
- Dark Sky Blue #448EE4 ΔE 0.046
- Soft Blue #6488EA ΔE 0.049
- Cool Blue #4984B8 ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.050
- Dusty Blue #5A86AD ΔE 0.051
- Off Blue #5684AE ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.056
Use #668CCC 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.