#668CCE
Closest named color: Faded Blue (#658CBB). oklch(64% 0.108 261), rgb(102, 140, 206).
Aa
Black text reads best on this color (6.20:1).
About this color
#668CCE is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.108 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.029 away. Black text reads best on it, at 6.20:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.20:1 |
| White text | 3.38:1 |
Values
| HEX | #668CCE |
| RGB | rgb(102, 140, 206) |
| HSL | hsl(218, 51%, 60%) |
| OKLCH | oklch(64% 0.108 261) |
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 #668CCE | 3.38:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #668CCE | 6.20:1 | AA | Lc 42.9 | Non-text elements, placeholder text |
| #668CCE text on white | 3.38:1 | AA large text | Lc 61.2 | Content text, not long reading |
| #668CCE text on black | 6.20:1 | AA | Lc -40.5 | 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
#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
#AEC2E4
oklch(81% 0.053 261)
-
Step 400
400
#83A1D6
oklch(70.7% 0.085 261.5)
-
Step 500
500 (this color)
#668CCE
oklch(64% 0.108 261)
-
Step 600
600
#4A72B8
oklch(55.6% 0.118 260.9)
-
Step 700
700
#3C5F9E
oklch(49% 0.109 261.3)
-
Step 800
800
#314E80
oklch(42.6% 0.091 260.7)
-
Step 900
900
#2C4167
oklch(37.7% 0.071 261.6)
-
Step 950
950
#1A263C
oklch(26.9% 0.045 261.9)
#668CCE 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) | #7291D1 | 0.021 |
| Deuteranopia (no green cones) | #6687CD | 0.014 |
| Tritanopia (no blue cones) | #369AA4 | 0.096 |
| Achromatopsia (no color) | #8C8C8C | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668CCE
#668CCE
oklch(64% 0.108 261)
- #AE8535
#AE8535
oklch(64.1% 0.109 81.2)
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 #668CCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.029
- Dark Sky Blue #448EE4 ΔE 0.043
- Soft Blue #6488EA ΔE 0.046
- Cornflower Blue #6495ED ΔE 0.048
- Cool Blue #4984B8 ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.054
- Off Blue #5684AE ΔE 0.055
Use #668CCE 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.