#668DCB
Closest named color: Faded Blue (#658CBB). oklch(64.1% 0.103 259.4), rgb(102, 141, 203).
Aa
Black text reads best on this color (6.23:1).
About this color
#668DCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.103 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.024 away. Black text reads best on it, at 6.23:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.23:1 |
| White text | 3.36:1 |
Values
| HEX | #668DCB |
| RGB | rgb(102, 141, 203) |
| HSL | hsl(217, 49%, 60%) |
| OKLCH | oklch(64.1% 0.103 259.4) |
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 #668DCB | 3.36:1 | AA large text | Lc -66.5 | Content text, not long reading |
| Black text on #668DCB | 6.23:1 | AA | Lc 43.0 | Non-text elements, placeholder text |
| #668DCB text on white | 3.36:1 | AA large text | Lc 61.0 | Content text, not long reading |
| #668DCB text on black | 6.23:1 | AA | Lc -40.7 | 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
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#AEC2E2
oklch(81% 0.05 259.8)
-
Step 400
400
#83A2D3
oklch(70.7% 0.08 259.4)
-
Step 500
500 (this color)
#668DCB
oklch(64.1% 0.103 259.4)
-
Step 600
600
#4A73B5
oklch(55.6% 0.113 259.5)
-
Step 700
700
#3B609B
oklch(49% 0.104 259.4)
-
Step 800
800
#314F7E
oklch(42.8% 0.086 259.1)
-
Step 900
900
#2B4265
oklch(37.7% 0.067 258.5)
-
Step 950
950
#1A273B
oklch(27.1% 0.042 258.8)
#668DCB 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) | #7591CE | 0.023 |
| Deuteranopia (no green cones) | #6988CA | 0.013 |
| Tritanopia (no blue cones) | #389BA3 | 0.093 |
| Achromatopsia (no color) | #8C8C8C | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668DCB
#668DCB
oklch(64.1% 0.103 259.4)
- #AE853C
#AE853C
oklch(64.2% 0.103 79.5)
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 #668DCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.050
- Cool Blue #4984B8 ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.051
- Soft Blue #6488EA ΔE 0.052
- Off Blue #5684AE ΔE 0.052
- Silver Lake Blue #778DA9 ΔE 0.055
Use #668DCB 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.