#668CC4
Closest named color: Faded Blue (#658CBB). oklch(63.5% 0.095 257.9), rgb(102, 140, 196).
Aa
Black text reads best on this color (6.11:1).
About this color
#668CC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.095 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.014 away. Black text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.11:1 |
| White text | 3.43:1 |
Values
| HEX | #668CC4 |
| RGB | rgb(102, 140, 196) |
| HSL | hsl(216, 44%, 58%) |
| OKLCH | oklch(63.5% 0.095 257.9) |
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 #668CC4 | 3.43:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #668CC4 | 6.11:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #668CC4 text on white | 3.43:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #668CC4 text on black | 6.11:1 | AA | Lc -39.9 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AEC2DF
oklch(80.8% 0.047 257.6)
-
Step 400
400
#84A2CF
oklch(70.6% 0.074 258.3)
-
Step 500
500 (this color)
#668CC4
oklch(63.5% 0.095 257.9)
-
Step 600
600
#4C74AF
oklch(55.6% 0.103 258)
-
Step 700
700
#3D6197
oklch(49.1% 0.097 258.3)
-
Step 800
800
#324F7A
oklch(42.6% 0.08 258.1)
-
Step 900
900
#2C4262
oklch(37.6% 0.062 257.7)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#668CC4 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) | #778FC6 | 0.023 |
| Deuteranopia (no green cones) | #6C86C3 | 0.017 |
| Tritanopia (no blue cones) | #3E98A0 | 0.083 |
| Achromatopsia (no color) | #8A8A8A | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668CC4
#668CC4
oklch(63.5% 0.095 257.9)
- #AA8343
#AA8343
oklch(63.4% 0.095 78)
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 #668CC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.014
- Dusty Blue #5A86AD ΔE 0.040
- Off Blue #5684AE ΔE 0.043
- Cool Blue #4984B8 ΔE 0.044
- Silver Lake Blue #778DA9 ΔE 0.046
- Steel Blue #4682B4 ΔE 0.052
- Blue Grey #758DA3 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.055
Use #668CC4 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.