#66718B
Closest named color: Metallic Blue (#4F738E). oklch(54.9% 0.043 267), rgb(102, 113, 139).
Aa
White text reads best on this color (4.88:1).
About this color
#66718B is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.043 and its hue 267°. 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 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #66718B |
| RGB | rgb(102, 113, 139) |
| HSL | hsl(222, 15%, 47%) |
| OKLCH | oklch(54.9% 0.043 267) |
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 #66718B | 4.88:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #66718B | 4.29:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #66718B text on white | 4.88:1 | AA | Lc 73.9 | Content text, not long reading |
| #66718B text on black | 4.29:1 | AA large text | Lc -27.8 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E0
oklch(88.5% 0.01 267.4)
-
Step 300
300
#BBC1CD
oklch(81% 0.018 264.5)
-
Step 400
400
#98A0B4
oklch(70.6% 0.031 268.2)
-
Step 500
500
#7F89A2
oklch(63.1% 0.039 268.1)
-
Step 600
600 (this color)
#66718B
oklch(54.9% 0.043 267)
-
Step 700
700
#566078
oklch(49% 0.041 267.2)
-
Step 800
800
#474F62
oklch(42.8% 0.033 267.1)
-
Step 900
900
#3B4150
oklch(37.6% 0.027 268)
-
Step 950
950
#23262F
oklch(26.9% 0.017 270.7)
#66718B 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) | #69738C | 0.008 |
| Deuteranopia (no green cones) | #66708A | 0.003 |
| Tritanopia (no blue cones) | #5C767A | 0.038 |
| Achromatopsia (no color) | #717171 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66718B
#66718B
oklch(54.9% 0.043 267)
- #7C7055
#7C7055
oklch(54.9% 0.042 86.8)
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 #66718B, 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 0.029
- Grey Blue #647D8E ΔE 0.034
- Battleship Grey #6B7C85 ΔE 0.038
- Stormy Blue #507B9C ΔE 0.039
- Dull Blue #49759C ΔE 0.041
- Grey Purple #826D8C ΔE 0.043
- Slate Gray #708090 ΔE 0.046
Use #66718B 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.