#668BB3
Closest named color: Faded Blue (#658CBB). oklch(62.5% 0.074 251), rgb(102, 139, 179).
Aa
Black text reads best on this color (5.90:1).
About this color
#668BB3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.074 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.012 away. Black text reads best on it, at 5.90:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 5.90:1 |
| White text | 3.55:1 |
Values
| HEX | #668BB3 |
| RGB | rgb(102, 139, 179) |
| HSL | hsl(211, 34%, 55%) |
| OKLCH | oklch(62.5% 0.074 251) |
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 #668BB3 | 3.55:1 | AA large text | Lc -68.5 | Content text, not long reading |
| Black text on #668BB3 | 5.90:1 | AA | Lc 41.0 | Non-text elements, placeholder text |
| #668BB3 text on white | 3.55:1 | AA large text | Lc 63.1 | Content text, not long reading |
| #668BB3 text on black | 5.90:1 | AA | Lc -38.6 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B0C3D8
oklch(80.9% 0.036 250.9)
-
Step 400
400
#86A4C4
oklch(70.8% 0.058 250.3)
-
Step 500
500 (this color)
#668BB3
oklch(62.5% 0.074 251)
-
Step 600
600
#4F76A1
oklch(55.5% 0.081 251.7)
-
Step 700
700
#3F638A
oklch(49% 0.075 251.4)
-
Step 800
800
#355170
oklch(42.7% 0.062 251.8)
-
Step 900
900
#2E435A
oklch(37.6% 0.048 251.4)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#668BB3 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) | #7B8CB5 | 0.027 |
| Deuteranopia (no green cones) | #7284B2 | 0.023 |
| Tritanopia (no blue cones) | #499498 | 0.064 |
| Achromatopsia (no color) | #888888 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668BB3
#668BB3
oklch(62.5% 0.074 251)
- #A48055
#A48055
oklch(62.4% 0.074 70.8)
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 #668BB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.012
- Dusty Blue #5A86AD ΔE 0.022
- Silver Lake Blue #778DA9 ΔE 0.027
- Off Blue #5684AE ΔE 0.029
- Blue Grey #758DA3 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.040
- Light Slate Gray #778899 ΔE 0.042
- Steel #738595 ΔE 0.045
Use #668BB3 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.