#66728D
Closest named color: Metallic Blue (#4F738E). oklch(55.2% 0.045 266.2), rgb(102, 114, 141).
Aa
White text reads best on this color (4.82:1).
About this color
#66728D is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.045 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.029 away. White text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.35:1 |
| White text | 4.82:1 |
Values
| HEX | #66728D |
| RGB | rgb(102, 114, 141) |
| HSL | hsl(222, 16%, 48%) |
| OKLCH | oklch(55.2% 0.045 266.2) |
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 #66728D | 4.82:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #66728D | 4.35:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #66728D text on white | 4.82:1 | AA | Lc 73.4 | Content text, not long reading |
| #66728D text on black | 4.35:1 | AA large text | Lc -28.3 | Dividers and decoration only |
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 600.
-
Step 50
50
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E1
oklch(88.5% 0.011 269.5)
-
Step 300
300
#BAC1CE
oklch(80.9% 0.02 263)
-
Step 400
400
#97A1B5
oklch(70.8% 0.031 264.4)
-
Step 500
500
#7E89A3
oklch(63% 0.041 267.1)
-
Step 600
600 (this color)
#66728D
oklch(55.2% 0.045 266.2)
-
Step 700
700
#566079
oklch(49% 0.042 267.8)
-
Step 800
800
#464F62
oklch(42.7% 0.034 265.1)
-
Step 900
900
#3B4150
oklch(37.6% 0.027 268)
-
Step 950
950
#23262F
oklch(26.9% 0.017 270.7)
#66728D 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) | #6A748E | 0.009 |
| Deuteranopia (no green cones) | #66708C | 0.006 |
| Tritanopia (no blue cones) | #5C777B | 0.039 |
| Achromatopsia (no color) | #727272 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66728D
#66728D
oklch(55.2% 0.045 266.2)
- #7E7154
#7E7154
oklch(55.3% 0.045 86.6)
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 #66728D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.029
- Battleship Gray #6C757D ΔE 0.030
- Grey Blue #647D8E ΔE 0.032
- Stormy Blue #507B9C ΔE 0.037
- Battleship Grey #6B7C85 ΔE 0.037
- Dull Blue #49759C ΔE 0.040
- Grey Purple #826D8C ΔE 0.043
- Slate Gray #708090 ΔE 0.044
Use #66728D 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.