#66758A
Closest named color: Battleship Gray (#6C757D). oklch(55.8% 0.037 256.8), rgb(102, 117, 138).
Aa
White text reads best on this color (4.69:1).
About this color
#66758A is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.037 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Gray (#6C757D), ΔE 0.021 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #66758A |
| RGB | rgb(102, 117, 138) |
| HSL | hsl(215, 15%, 47%) |
| OKLCH | oklch(55.8% 0.037 256.8) |
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 #66758A | 4.69:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #66758A | 4.47:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #66758A text on white | 4.69:1 | AA | Lc 72.6 | Content text, not long reading |
| #66758A text on black | 4.47:1 | AA large text | Lc -29.1 | 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
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5D9DF
oklch(88.4% 0.009 258.3)
-
Step 300
300
#BAC1CC
oklch(80.9% 0.017 259.4)
-
Step 400
400
#96A2B2
oklch(70.8% 0.027 255.6)
-
Step 500
500
#7C8B9F
oklch(63.2% 0.035 255.6)
-
Step 600
600 (this color)
#66758A
oklch(55.8% 0.037 256.8)
-
Step 700
700
#546275
oklch(49.2% 0.035 256.1)
-
Step 800
800
#45505F
oklch(42.7% 0.029 256.2)
-
Step 900
900
#3A424E
oklch(37.7% 0.023 258.4)
-
Step 950
950
#22272D
oklch(27% 0.013 253)
#66758A 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) | #6E768B | 0.012 |
| Deuteranopia (no green cones) | #6A728A | 0.010 |
| Tritanopia (no blue cones) | #5C797C | 0.032 |
| Achromatopsia (no color) | #747474 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66758A
#66758A
oklch(55.8% 0.037 256.8)
- #80715C
#80715C
oklch(55.7% 0.036 76.1)
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 #66758A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.021
- Grey Blue #647D8E ΔE 0.022
- Battleship Grey #6B7C85 ΔE 0.026
- Metallic Blue #4F738E ΔE 0.031
- Slate Gray #708090 ΔE 0.036
- Stormy Blue #507B9C ΔE 0.036
- Steel Grey #6F828A ΔE 0.042
- Dull Blue #49759C ΔE 0.043
Use #66758A 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.