#668BA6
Closest named color: Blue Grey (#758DA3). oklch(61.9% 0.058 240.5), rgb(102, 139, 166).
Aa
Black text reads best on this color (5.80:1).
About this color
#668BA6 is a medium-dark, muted blue. In OKLCH its lightness is 62%, its chroma 0.058 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Grey (#758DA3), ΔE 0.021 away. Black text reads best on it, at 5.80:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 5.80:1 |
| White text | 3.61:1 |
Values
| HEX | #668BA6 |
| RGB | rgb(102, 139, 166) |
| HSL | hsl(205, 26%, 53%) |
| OKLCH | oklch(61.9% 0.058 240.5) |
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 #668BA6 | 3.61:1 | AA large text | Lc -69.2 | Content text, not long reading |
| Black text on #668BA6 | 5.80:1 | AA | Lc 40.4 | Non-text elements, placeholder text |
| #668BA6 text on white | 3.61:1 | AA large text | Lc 63.7 | Content text, not long reading |
| #668BA6 text on black | 5.80:1 | AA | Lc -38.0 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B1C3D2
oklch(80.8% 0.029 243.2)
-
Step 400
400
#88A5BB
oklch(70.8% 0.046 241)
-
Step 500
500 (this color)
#668BA6
oklch(61.9% 0.058 240.5)
-
Step 600
600
#507895
oklch(55.5% 0.064 240.8)
-
Step 700
700
#41657F
oklch(49% 0.059 240.9)
-
Step 800
800
#365367
oklch(42.8% 0.048 239.5)
-
Step 900
900
#2F4454
oklch(37.6% 0.038 241.8)
-
Step 950
950
#1C2831
oklch(27% 0.024 241.1)
#668BA6 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) | #7F8AA7 | 0.032 |
| Deuteranopia (no green cones) | #7784A6 | 0.028 |
| Tritanopia (no blue cones) | #4F9294 | 0.047 |
| Achromatopsia (no color) | #878787 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668BA6
#668BA6
oklch(61.9% 0.058 240.5)
- #A07E62
#A07E62
oklch(61.9% 0.058 60.9)
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 #668BA6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.021
- Silver Lake Blue #778DA9 ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.025
- Light Slate Gray #778899 ΔE 0.026
- Steel #738595 ΔE 0.029
- Faded Blue #658CBB ΔE 0.032
- Off Blue #5684AE ΔE 0.033
- Slate Gray #708090 ΔE 0.039
Use #668BA6 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.