#668EA4
Closest named color: Blue Grey (#758DA3). oklch(62.5% 0.055 232.9), rgb(102, 142, 164).
Aa
Black text reads best on this color (5.97:1).
About this color
#668EA4 is a medium-light, muted blue. In OKLCH its lightness is 63%, its chroma 0.055 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Grey (#758DA3), ΔE 0.018 away. Black text reads best on it, at 5.97:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 5.97:1 |
| White text | 3.51:1 |
Values
| HEX | #668EA4 |
| RGB | rgb(102, 142, 164) |
| HSL | hsl(201, 25%, 52%) |
| OKLCH | oklch(62.5% 0.055 232.9) |
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 #668EA4 | 3.51:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #668EA4 | 5.97:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #668EA4 text on white | 3.51:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #668EA4 text on black | 5.97:1 | AA | Lc -39.0 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE2
oklch(88.5% 0.015 235.4)
-
Step 300
300
#B0C4CF
oklch(80.9% 0.027 231.7)
-
Step 400
400
#86A6B7
oklch(70.7% 0.043 231.3)
-
Step 500
500 (this color)
#668EA4
oklch(62.5% 0.055 232.9)
-
Step 600
600
#4E7A91
oklch(55.7% 0.06 232.1)
-
Step 700
700
#3F667B
oklch(49% 0.056 233.1)
-
Step 800
800
#345464
oklch(42.8% 0.046 231)
-
Step 900
900
#2E4552
oklch(37.7% 0.036 233.8)
-
Step 950
950
#1B2830
oklch(26.9% 0.023 235.8)
#668EA4 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) | #848DA5 | 0.038 |
| Deuteranopia (no green cones) | #7B86A4 | 0.033 |
| Tritanopia (no blue cones) | #509495 | 0.041 |
| Achromatopsia (no color) | #898989 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668EA4
#668EA4
oklch(62.5% 0.055 232.9)
- #A37F69
#A37F69
oklch(62.5% 0.055 52.9)
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 #668EA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.018
- Silver Lake Blue #778DA9 ΔE 0.023
- Light Slate Gray #778899 ΔE 0.026
- Steel #738595 ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.034
- Faded Blue #658CBB ΔE 0.038
- Off Blue #5684AE ΔE 0.042
- Slate Gray #708090 ΔE 0.042
Use #668EA4 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.