#668FAC
Closest named color: Silver Lake Blue (#778DA9). oklch(63.1% 0.063 239.8), rgb(102, 143, 172).
Aa
Black text reads best on this color (6.08:1).
About this color
#668FAC is a medium-light, muted blue. In OKLCH its lightness is 63%, its chroma 0.063 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Silver Lake Blue (#778DA9), ΔE 0.020 away. Black text reads best on it, at 6.08:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Silver Lake Blue (#778DA9) |
| Black text | 6.08:1 |
| White text | 3.44:1 |
Values
| HEX | #668FAC |
| RGB | rgb(102, 143, 172) |
| HSL | hsl(205, 30%, 54%) |
| OKLCH | oklch(63.1% 0.063 239.8) |
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 #668FAC | 3.44:1 | AA large text | Lc -67.4 | Content text, not long reading |
| Black text on #668FAC | 6.08:1 | AA | Lc 42.1 | Non-text elements, placeholder text |
| #668FAC text on white | 3.44:1 | AA large text | Lc 62.0 | Content text, not long reading |
| #668FAC text on black | 6.08:1 | AA | Lc -39.7 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AFC4D3
oklch(80.9% 0.031 238.9)
-
Step 400
400
#85A5BD
oklch(70.6% 0.05 240.8)
-
Step 500
500 (this color)
#668FAC
oklch(63.1% 0.063 239.8)
-
Step 600
600
#4D7998
oklch(55.7% 0.069 240.3)
-
Step 700
700
#3D6681
oklch(49.2% 0.063 238.7)
-
Step 800
800
#335369
oklch(42.7% 0.053 239.7)
-
Step 900
900
#2D4555
oklch(37.8% 0.04 238.4)
-
Step 950
950
#1B2832
oklch(27% 0.026 242)
#668FAC 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) | #828EAD | 0.035 |
| Deuteranopia (no green cones) | #7987AC | 0.031 |
| Tritanopia (no blue cones) | #4C9698 | 0.050 |
| Achromatopsia (no color) | #8A8A8A | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668FAC
#668FAC
oklch(63.1% 0.063 239.8)
- #A68163
#A68163
oklch(63.1% 0.062 60.4)
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 #668FAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Silver Lake Blue #778DA9 ΔE 0.020
- Blue Grey #758DA3 ΔE 0.021
- Faded Blue #658CBB ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.031
- Light Slate Gray #778899 ΔE 0.033
- Steel #738595 ΔE 0.039
- Off Blue #5684AE ΔE 0.040
- Slate Gray #708090 ΔE 0.050
Use #668FAC 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.